Model 4700 Maintenance Manual
Section 8. Theory of Operation
Single Traction Motor Trucks >S/N 10676 Item
Connection
Function Description
Theory of Operation
Pinout Matrix Normal Level
Signal Source
Signal User
246
J102-1
GND
B– supply from Battery. This B– is used by LP1 and LP2. If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
BT1
LP1 and LP2
247
J102-2
TAIL LIGHT
Output from VM (J34-1) to the Right Tail Light (LP2). If not present, check VM, wiring, and connections.
+24V
VM
Tail Lights
248
J102-3
TAIL LIGHT
Tied to J102-2.
+24V
VM
Tail Lights
249
J102-4
TAIL LIGHT
Output from VM (J34-1) to the Right Brake Light (LP1) when traveling and changing direction or traveling and pressing brake pedal. If not present, check VM, wiring, and connections.
+24V
VM
Brake Light
250
J102-5
BRAKE LIGHT
Tied to J102-4.
+24V
VM
Tail Lights
251
J102-6
NOT USED
252
J103
AC+, N–
Connection for optional Forward Right Work Light (LP6).
+24V ON
VM
LP6
253
J104
AC+, N–
Connection for optional Forward Left Work Light (LP7).
+24V ON
VM
LP7
254
J105
AH+, N–
Connection for optional Backward Left Work Light (LP9).
+24V ON
VM
LP9
255
J106
AH+, N–
Connection for optional Backward Right Work Light (LP8).
+24V ON
VM
LP8
256
J107-1
+V
Voltage from the HCB (JCM-2) to the Lowering (EVP1) Solenoid. If not present, check the HCB, fuse F15, wiring, and connections.
B+
HCB
EVP1
257
J107-2
LOW
Voltage from the HCB (JCM-1) to turn on the Lowering Solenoid (EVP1). If not present, check the HCB, wiring, and connections.
Approx. 2-11V wrt B+ (approx. 18 ohms across coil)
HCB
EVP1
258
J108-1
+V
Voltage from the HCB (JCM-2) to the Lifting Solenoid (EV2). If not present, check the HCB, fuse F15, wiring, and connections.
B+
HCB
EV2
259
J108-2
LIFT
Voltage from the HCB (JCM-3) to turn on the Lifting Solenoid (EV2). If not present, check the HCB, wiring, and connections.
Approx. 24V wrt B+ (approx. 27 ohms across coil)
HCB
EV2
260
J109-1
+V
Voltage from the HCB (JCM-5) to the Tilt Forward Solenoid (EV3). If not present, check the HCB, fuse F16, wiring, and connections.
B+
HCB
EV3
Publication 1160093, Issued: 20 May 2013
8-69
