Co mp on en t Ide n tifie r (CID) L is t C I D N o. Co mp on en t C o m p ut e r i z ed M on ito ri ng S yst e m (CMS ) MI D 2 6 96 100 110 168 177 248 270 271 324 600 601 627
F uel Leve l Sen so r Engine O il P re s sur e S e nsor Engine C ool an t Tem pe r atu re Se n so r Electric al S ys tem V o lta ge Pow er T ra in Oi l T e mpe ra tur e S en sor D at a link H ar ness Cod e Act ion Alar m Act ion Lam p H ydraulic Oil T emp er atu r e Sen s or Brake Air Pr essu re Se n so r Par king B r ak e S witch
E l e c t r o n i c Tran sm is s i on Control MI D 81 Electric al S ys tem V o lta ge 168 Engine R PM Se n so r 190 C AT D at a L in k 248 R ide Cont rol S ol e no i d 362 Aut o/ M anua l Swit ch 368 Air Inlet He ate r R el ay 617 D ow nshift Swi tch 621 Par king B r ak e S witch 627 Sol enoid 1 ( Rev e rse ) 631 Sol enoid 2 ( Fo rw ar d) 632 Sol enoid 3 ( Sp ee d 4) 633 Sol enoid 4 ( Sp ee d 3) 634 Sol enoid 5 ( Sp ee d 2) 635 Sol enoid 6 ( Sp ee d 1) 636 H ar ness Cod e 650 Shi ft Handle 668 T rans miss io n S pe e d S ens or 671 R ide Cont rol S wi tch 680 Ser vice Ide n tific at ion Cod e 685 Opt ions Id e ntif i ca tio n Co de 687 D ual Horse p owe r So len o id 688 C ID l ist applies to Monito r a nd T ra ns mi ssio n Con tr ols.
Mode Number
N or mal
0
H ar ness Code
1
N um eric R eadout
2
Ser vice
3
T at tletale ( Log)
4
U ni ts
5
T ot al Load Count D is p la y
6
C al ibr ation (EPT C II )
7
Failure Mode Identifiers (FMI)¹ FMI No. 0 1 2 3 4 5 6 7 8 9 10 11 12 13
Failure Description Data valid but above normal operational range. Data valid but below normal operational range. Data erratic, intermittent, or incorrect. Voltage above normal or shorted high. Voltage below normal or shorted low. Current below normal or open circuit. Current above normal or grounded circuit. Mechanical system not responding properly. Abnormal frequency, pulse width, or period. Abnormal update. Abnormal rate of change. Failure mode not identifiable. Bad device or component. Out of calibration.
1 01
RD
Bat (+)
500
BR
W ipe r - Fron t (P ar k)
1 02
BU
H dLm p
501
GN
W ipe r - Fr on t (Lo )
1 05
BR
Key Sw
502
OR
W ipe r - Fron t (Hi)
1 07
WH
Eng S hut D own Fir e S uppr
503
BR
W ipe r - Rea r ( Par k )
1 09
OR
Alt Ou tp ut ( + ) T erm
504
YL
W ipe r - Rea r ( Lo)
1 12
PU
M ain P owe r Rl y O ut pu t
505
BU
W ipe r - Rea r ( Hi )
1 13
OR
Op r M on Pa nel VM IS B + Swi tc h ed
506
PU
W as he r - F r on t
1 16
BR
Aux Ck t
507
WH
W as he r - Re ar
1 18
GY
Aux Ck t
508
PU
R adi o S peak er - Le ft
1 20
YL
Aux Ck t
509
WH
R adi o S peak er - Le ft ( Co mm on)
1 21
YL
Bc k p A lar m t o La mp
511
BR
R adi o S peak er - Righ t
1 24
GN
A/ C
512
GN
R adi o S peak er - Righ t (Com mo n)
1 26
PK
XM S N Ct r l
513
OR
A/ C Co mpr e ss or / Ref rige rant P re ss . Sw
1 27
OR
Aux Ck t
514
PU
A/ C Co nde ns er M ot or
1 28
PK
Aux Ck t
515
GY
Blow er M ot or (Hi )
1 29
BU
Aux Ck t
515
GY
Blow er M ot or (Hi )
1 30
GN
Aux Ck t
516
GN
Blow er M ot or (M edium )
1 38
GN
Aut o Lu be Pum p to P aylo ad M on
517
BU
Blow er M ot or (Lo )
1 58
BR
Aux Ck t
520
WH
Op r A /C Sw to Th er mo st at /F us e
1 64
WH
H yd ro C tr l W T L Pow er t rai n Ct r l
521
YL
A/ C Sw t o Re fr i ger ant Sw
1 74
PK
Aux Ck t
522
WH
A/ C Cl ut c h to Th er mo st at S w
1 77
OR
M ain B r kr
537
GN
T urn S ig nal S w to F las h er
1 93
PU
Aux Ck t
538
BR
H azar d I ndicat or
2 00
BK
M ain C has s is
2 01
BK
Op r M on Pa nel VM IS C M S
2 02
BK
2 03 2 07
592
BU
D C/D C Co nv er t er P ower Ou tp ut
A52 1
GY
Sw to Sol Val v e 2nd_I m p Pum p
XM S N Ct r l
604
OR
St op La mp
BK
C has si s D ia gnos t ic
605
YL
T urn La mp - Lef t
BK
St arte r D ia gnos tic
606
GY
T urn La mp - Ri ght
2 50
BK
Pay l oad M on - C ust ome r G nd
608
GN
F loo d L am p - Rea r
2 51
BK
Pay l oad M ON- Sy st em G nd
610
OR
H ead Lam p Bas ic
2 70
BK
C MS Id en t Cod e 0
611
PU
H ead Lam p Hi
2 71
BK
C MS Id en t Cod e 1
614
PU
Par k /T ai l/D as h Lam p
2 72
BK
C MS Id en t Cod e 2
615
YL
C ab Flood La mp/ R OPS
2 73
BK
C MS Id en t Cod e 3
617
BR
T ail/P os i ti on Lam p - L eft (R oad P kg ) /W i dt h
BK
C MS Id en t Cod e 4
2 75
BK
C MS Id en t Cod e 5
2 80
BK
XM SN C t rl I de nt Co de 4
710
2 81
BK
XM SN C t rl I de nt Co de 5
2 90
BK
C MS Ser vice
2 91
BK
C o n ne c to r Num be r
Sc he mat ic M ac hi ne Lo ca ti on Lo ca ti on
C ONN 1 C- 11 25 C ONN 2 D- 10 26 E -12 D C ONN 3 D iagnosti c Connect or C ONN 4 F-1 0 27 C ONN 5 B -8 28 C ONN 6 C- 8 28 C ONN 7 D- 9 29 C ONN 8 E -9 6 E -9 6 C ONN 9 Ser vice Code Plug F-9 6 C ONN 10 Opt ions C ode Plug C ONN 11 E -8 A C ONN 12 D- 8 E C ONN 13 E -7 30 C ONN 14 E -7 B C ONN 15 F-7 B C ONN 16 F-7 B C ONN 17 C- 7 B C ONN 18 A -6 B C ONN 19 B -6 B C ONN 20 B -6 E C ONN 21 D- 6 B C ONN 22 D- 6 C C ONN 23 A -4 31 C ONN 24 A -4 6 D- 4 B C ONN 25 Ser vice Mode Plug D- 4 B C ONN 26 H ar ness Code C ONN 27 E -5 B C ONN 28 A -3 32 C ONN 29 C- 3 B C ONN 30 C- 3 B C ONN 31 D- 3 B F-3 A C ONN 32 C us tomer Data C onnecti on C ONN 33 F-3 A C ONN 34 B -2 33 C ONN 35 C- 2 33 C ONN 36 C- 2 33 C ONN 37 B -2 33 C ONN 38 D- 2 33 C ONN 39 D- 2 33 C ONN 40 D- 2 33 C ONN 41 E -2 33 C ONN 42 E -2 33 C ONN 44 E -1 33 ¹ The c onnec tors shown in th i s ch ar t ar e fo r har nes s t o har ne ss connect or s wit h a minimu m of f our co n ta cts an d ot he r sp ec i al connect or s. Connec t ors tha t joi n a ha r ness to a c om pon en t ar e generally located at or ne ar th e co mpon e nt. S ee t he C om ponent Locat ion Chart .
619
GN GN
XM S N Spe ed Pi c kup Sig nal
720
PU
XM S N Br ak e Sw
751
GN
XM S N Shi f t S ol No. 1 or 3
C MS Cl ear
752
YL
XM S N Shi f t S ol No. 2
BK
C MS US/ Me tr ic U nit s
754
BU
XM S N Shi f t S ol No. 3 or 1
BK
XM SN C t rl O pt i ons Co de 0
755
OR
XM S N Shi f t S ol No. 4 or 5
A222
BK
XM SN C t rl O pt i ons Co de 1
761
GY
U ft Ki ck ou t S ol Sw
A232
BK
XM SN C t rl O pt i ons Co de 2
762
YL
Buc k et Pos i ti one r S ol Sw
Bas ic Mac hin e Circu it s
795
YL
D ual Hp S ol
BU
St arte r N o. 1 So l
D 735
PK
(NFND) XMSN Cont Park Brk Lever Sw to Gnd
302
OR
St arte r N o. 1 Re s is t or t o Di agn os t ic
D 743
GN
( NF N D) R i de Con t - W T L I mp I C ont Sw to
304
WH
St arte r R ly N o. 1 O utput
306
GN
Starter Rly Coil to Neut Start Sw or Key Sw
D 744
WH
307
OR
Key Sw to Neut Start Sw or VMIS Sensor Module
308
YL
M ain Power Rl y Coi l
E70 1
PK
Aut o Ri de Cn tl Sw
310
PU
St art Aid Sw to S ta rt Ai d So l
E70 2
OR
Aut o Ri de Cn tl Sw
311
WH
St art Ai d So l t o T em p S w
818
BR
Ser i al D at a (T r ans mit)
321
BR
Bc k p A lar m L am p Tr av el A lar m
819
GY
Ser i al D at a (R ec eive)
326
PU
Key Sw “ C” T er m .
820
BU
T ran sm i t K ey
327
PK
Shu td own S ol
863
BU
Pay l oad M on Tran sm it LCD O ut
864
BR
31 19 7 27 10 30 16 33
8
1
26
25 11
D
12
17 24 9
2
14
A 6
4
22
C
20
21
C
E
15
Pin
13
Pay l oad M on Cloc k LCD Out
865
GY
Pay l oad M on Lat ch LC D O ut
405
GY
Op r M on Oi l Pr e ss . ( Lo Se tt ing )
900
PU
XM S N Shi f t S ol No. 5 or 4
409
OR
Op r M on Neu t
901
WH
XM S N Shi f t S ol No. 6
410
WH
Op r M on Fau l t Ala r m
910
YL
XM S N N eut r ali z er O ver r i de In dic ato r
411
PK
Op r Mo n M as t er Fa ult Lam p
944
416
OR
Sup pl St er Sw
417
GY
Pr ima ry St er S w
419
YL
Op r M on Pa rk ing B r ak e
2
A
19 7
8 D
12 17
11
F
23
22
3
27
5
10 33
SENDER - A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure.
20 15
T
D 85 7 68 8
18 14
26
25
1
31
16
24 9
21
6
32
29
2
E
30
28
FUSE - A component in an electrical circuit that will open the circuit if too much current flows through it.
B
C
RELAY (Magnetic Switch) - A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay.
13
4
CIRCUIT BREAKER (C/B) - A component in an electrical circuit that will open the circuit if too much current flows through it. This does not destroy the circuit breaker and it can be reset to become part of the circuit again.
Machine Harness Connector and Component Locations
SOLENOID - A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work. MAGNETIC LATCH SOLENOID - A magnetic latch solenoid is an electrical component that is activated by electricity and held latch by a permanent magnet. It has two coils (latch and unlatch) that make electromagnet when current flows through them. It also has an internal switch that places the latch coil circuit open at the time the coil latches.
C om po n e nt Lo c a t io n Co m p on e nt
Sc h em ati c L o catio n
Ma ch i n e L o catio n
S ens or—HydraulicT em p
A-2
13
S ens or — Li ft Cyl in der P ress ure
B-1
14
1
S ens or — Li ft Po sition
B-1
15
S ch em ati c L o catio n
M ach i ne L o catio n
BR
D ata L ink - (C AT )
A la rm — Ac tion
C-4
C
WH
Trans SoIl Sw to Gnd (Fwd Hi:CST, Rev:LRT)
A la rm — Back up (R oad in g)
A -12
1
966
GY
Trans Sol 3 Sw to Gnd (Fwd Lo:CST, 4th:LRT)
A la rm — Back up (S td )
C-12
Co m p on e nt
BR
Op r M on Po wer Tr ai n Oi l F i lt er
968
BR
Trans Sol 2 Sw to Gnd (Rev:CST, Fwd:LRT)
A lt ernat or
C-11
2
S ens or — T rans Oil T em p
E-1 1
11
429
YL
Op r M on Br ak e Oil Tem p
969
YL
Trans Sol 3 Sw to B+ :CST, for LRT Sol 2
B at tery
A -11
3
S ens or — T rans Outp ut Sp ee d
A-2
16
432
PK
Op r M on Br ak e Pr e ss . ( Oi l)
970
GN
Trans Sol 4 Sw to Gnd (Spdl :CST, 3rd:LRT)
B reak er — Alte rnat or
F -12
D
S ol enoi d — A/ C Clut ch
D-1 2
17
433
BU
Op r M on Br ak e Pr e ss . ( Oi l) Jum pe r
971
YL
T ran s So l 5 Sw t o Gn d
B reak er — Blower M ot ors
B -5
D
S ol enoi d — B uc ket F loa t
B-5
E
B reak er — Engine Shutdown
F -12
D
S ol enoi d — B uc ket Kick out
B-5
E
D-1 1
9
440
BR
Air P re ss . G auge
973
BR
C ST Aut os hif t — Au to /M anu al Sw 2
B reak er — M ain
F -12
D
Solenoid — Dual HP/Engine Shutdown
441
OR
Eng C ool ant Tem p Ga uge
974
PU
C ST Aut os hif t - Slo w M od e Sw
B reak er — Ru nni ng Lam p
F -12
D
S ol enoi d — Dual Pum p
A-7
18
4 42
GY
H yd S ys t em Tem p Ga uge
975
WH
C ST Aut os hif t - Sol R et ur n
B uf fer — F uel Lev el
F -1
5
S ol enoi d — Lift K ick out
B-4
E
4 43
YL
Pow er T r ain Te mp Ga uge
976
OR
R ide Cont Sol
Computerized Monitoring System (CMS)
B -4
B
S ol enoi d — LRT V al ves
D-9
24
4 47
PK
F uel Le ve l G auge
976
OR
R ide Cont Sol
Control — A uto shif t T ran sm iss ion
F -10
6
S ol enoi d — Ride Co ntrol V al ve
B-1
14
4 50
YL
T ach Send er ( +)
977
YL
C ST Aut os hif t - Aut o/ Ma nua l Sw 1
Control — E ngi ne Shutd own
F -10
F
S ol enoi d — S tart A id
A-1 0
F
4 75
BR
Ov er st r oke Sw t o T r ail i ng U ni t
978
GN
C ST Aut os hif t - Slo w M od e Sw
Control — P ayload M onito r
E -3
E
S tart er
B-1 0
9
4 96
WH
Op r M on Pa nel Hy d O i l Lev el
Conve rt er — Vo lta ge
F -6
A
S wi tch — A/ C R efrigera nt
D-1 2
17
A 401
YL
Elec tri cal S ys t em N o. 1 V olt ag e
Display — Pa yload M onitor
F -3
A
S wi tch — Auto Ride Control
C-4
C
B 412
YL
( NF N D) P MS L if t Po s Se nso r
19
B 413
PU
( NF N D) P MS L if t Cy l P r ess . Se ns or
B 414
OR
( NF N D) P MS N or m/ C al ibr a te O ut
B 41 5
PK
( NF N D) P MS C le ar / Chg O ut
B 416
WH
( NF N D) PMS Re w ei g h Sw In
B 417
YL
( NF N D) PMS St or e S w I n
GN
( NF N D) T r ans So l 1 Sw t o B+ ( LRT O nl y )
Printed in U.S.A.
© 1997 Caterpillar All Rights Reserved
965
B99 9
Wire Gauge
REED SWITCH - A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
945
Trans Sol 6 Sw to Gnd (Spd3:CST, lst:LRT)
200-BK-14
Circuit Number Identification
Serial #: 5XJ588-UP
D ata L ink + ( CA T)
BU
Wire Color
Electrical Schematic Symbols And Definitions
OR
972
9X-1123 325-PK-14
Socket
980F Series II Wheel Loader Electrical System
426
Lam p I ndi cat or
AA 1
325-PK-14
Gn d N/ C
Alte r nat or ( R ) T er m .
A
A
18
32
Component Part Number
Single Wire Connector
B
28
23
Wire, Cable, or Harness Assembly Identification
29 F
Typical representation of a Sure-Seal connector. The plugand receptacle contain both pins and sockets.
Pin or Socket Number
5
( NF N D) R i de Con t - W T L I mp l Cont S w t o
GN
YL
Receptacle
Gn d N/ O
403
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
2
3
1 2
1 2
Plug
Co nt ro l Circu its
2 92
439
AA 1
H ead Lam p LoC ont r ol C i rc uits
A221
301
A
Lig h tin g Circu its
2 74
Mo n it ori n g Circ uits
Con n ecto r L oc atio n¹
Des crip tion Acc ess ory Circ uits
P owe r Circ uits
Gro un d Circ u its
Mo n i to ri ng S ys te m Mo de M o d e O f O p era t ion
Des crip tion
W ire W ire Nu mb er Co lo r
Harness And Wire Electrical Schematic Symbols
SENR6658 November 1997
Wi re Descri ptio n W ire W ire Num b er Co lo r
Electrical Schematic Symbols And Definitions Off Machine Switch Specification Part No. 114-5334
Function Ref rigerant Pressure (AC).
8N-1 693
Coolant Temperature (Start Aid)
9X-4276
Actuate 275 to 1750 kPa¹
Engine Oil
Deactuate —
Contact Position Normally Open²
(40 to 255 psi)
—
37.8 ± 2.8°C
26.7°C MIN
(100 ± 5°F)
(80°F MIN)
93.0 ± 20.8 kPa
68.9 ± 20.8 kPa
1-2 Normally Open
(14.0 ± 3.0 psi)
(10.0 ± 3.0 psi)
below 48 kPa
Normally Closed T
1-3 Normally Closed Transmission Neutralizer Pressure (Shifter) 9X-7781
Power Train Filter Pressure (EMS)
103 ± 20 kPa
69 kPa MIN
(15.0 ± 3.0 psi)
(10.0 psi MIN)
210 ± 70 kPa
—
(30 ± 10 psi)
—
¹ A hysteresis band exists: with increasing pressure the closed condition can be maintained up to 2800 kpa (405 psi), with decreasing pressure the closed condition can be maintained down to 170 kpa (25psi).
S wi tch — Bl owe r
E-7
B -7
A
S wi tch — Bra ke Oil (2)
F -1
5
F us e
B -5
E
S wi tch — Buc ket P os itioner
C-1
20
F us e
F -12
D
S wi tch — Di mm er
B-5
A
Lamp — Air P ress ure G aug e
E -3
B
S wi tch — Dis con nec t
A-1 1
9
Lamp — Auto Rid e C ont rol
B -4
B
S wi tch — Dual Pum p
B-3
B
Lamp — Cab F lood I ndi cat or
B -3
B
S wi tch — Eng in e Oil
E-1 2
11
Lamp — Hi gh B eam Ind ic at or
B -3
B
S wi tch — Fl ood Lamp
E-6
C
Lamp — Master A ction Lam p
B -3
B
S wi tch — Hydraulic Oil Le vel
B-2
13
Relay - Main Power
3T-0376
Lamp — Neu tral iz er Indic ator
E -3
B
S wi tch — Key S tart
D-5
C
Relay - Stop Lamp
3E-5239
360
Lamp — Ri de C ont rol
B -4
B
S wi tch — Lif t P os itioner
C-1
21
Resistor - System Voltage
6T-2217
150 ± 7.5
Lamp — T urn I ndicat or (LH)
B -3
B
S wi tch — Park ing B rak e
F -1
A
(CMS)/Starter Diagnostic
Lamp — Tu rn I ndicator (RH)
B -3
B
S wi tch — Powert rain F ilter
B-2
22
Solenoid - A/C Clutch
102-0347
14.4 ± 0.6
Lamp — XMS N Indica tor
E -3
B
S wi tch — Ref rige rant
D-7
13
Solenoid - Dual HP/Engine Shutdown
3E-6424
M eter — Service
E -3
7
S wi tch — Reweigh
F -2
C
M otor — Blower
D-7
8
S wi tch — Run nin g Lam p
E-6
C
M otor — Blower
E -7
8
S wi tch — St art A id
E-5
C
Solenoid - Dual Pump
7T-2052
41.9
M otor — W ashe r (F ront)
A -10
F
S wi tch — St art A id Coolant
D-1 2
23
Solenoid - LRT Valves (Trans)
3E-3748
8.5
M otor — Wash er (Re ar)
A -10
F
S wi tch — St op Lam p
F -2
10
Solenoid - Start Aid
9G-4365
6.0
M otor — Wiper (F ront)
E -4
B
S wi tch — St ore
F -2
C
M otor — Wiper (Rear)
E -6
A
S wi tch — Supplem ental Stee ri ng
A-2
22
Radio
F -6
A
S wi tch — Th erm ost at
D-7
19
Relay — Main
F -12
D
S wi tch — Tra ns A ut o/M an ual
D-3
B
Relay — Start
F -12
D
S wi tch — Tra ns D own shif t
D-5
C
Resisto r — S tart er
B -10
9
S wi tch — Tra ns N eut ra li zer Ove rrid e
D-3
B
Resisto r — S ys tem Volt age (C M S)
F -11
D
S wi tch — Tra ns N eut ra li zer Pres s ure
E-8
10
S end er — F uel Le vel
F -1
5
S wi tch — Tu rn Sig nal
B-6
B
S ens or — B rake A ir Pres sure
F -1
10
S wi tch — Wiper (F ront )
E-4
B
S ens or — Co olant Te mp
E -12
11
S wi tch — Wiper (Rear)
D-4
B
S ens or — E ngi ne Speed
E -11
12
T rans m iss ion S hi fter
E-7
A
B = Com ponents in Operator C om part m ent — In Das h. C = Com pon ent s in Op erat or Com partm ent — Right C ons ole. D = Com pon ent s on relay panel. E = Com ponents in serv ic e c om partm ent — Ri ght s ide . F = Com ponents In com pa rtm ent behind cab.
Flow Symbol
Normally Closed
A -10
A = Com ponents in Operator C om part m ent.
Level Symbol
Normally Closed
F la sher
M ach ine locations are re pea ted for c om pone nts locat ed c los e t og ether
Temperature Symbol
below 48 kPa 9X-9418
F
Dry er — B rak e A ir
Pressure Symbol
² Contact postion at the contacts of the harness connector.
Normally open switch that will close with an increase of a specific condition (temp-press-etc.). Normally open switch that is closed due to an applied condition, and will open again with a specific decrease in that condition.
Normally closed switch that will open with an increase of a specific condition.
Resistor, Sender and Solenoid Specifications Component Description
Part No.
Resistance (Ohms)¹ 25.5 ± 2.5
Push Coil
4.2 ± 0.42
Pull Coil
16.1 ± 1.61
Normally closed switch that is open due to an applied condition, and will close again with a specific decrease in that condition.
The circle indicates that the component has screw terminals and a wire can be disconnected from it.
No circle indicates that the wire cannot be disconnected from the component.
¹ At room temperature unless otherwise noted.
This indicates that the component has a wire connected to it that is connected to ground. Re la t e d E l e ct r ica l S e r vi ce M an ual s Ti tl e
For m N o.
Alternator 100-5047
SENR2082
Caterpillar Monitoring System
SENR6717
Payload Monitor
SENR4733
Starting And Charging Systems
SENR2947
Starting Motor: 6V-5539 Consist: 6V-5540
SENR3536
Consist: 106-8554
SENR3581
Consist: 6V-5582
SENR4975
Autoshift Control
SENR5922
This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.