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
225
J91-3
TAIL LIGHT
Output from VM (J34-1) to the Tail +24V ON; 0V Lights (LP2 and LP4). If not present OFF check VM, wiring, and connections.
VM
Tail Lights
226
J91-4
BRAKE LIGHT
Output from the VM (J34-13) to the Left Brake Light (LP3) when traveling and changing direction or traveling and pressing brake pedal. If not present, check VM, wiring, and connections.
+24V ON; 0V OFF
VM
Brake Lights
227
J91-5
BRAKE LIGHT
Output from VM (J34-13) 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 ON; 0V OFF
VM
Brake Lights
228
J91-6
NOT USED
229
J92-1
GND
B– to the Forward Right Working Light (LP6). If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
BT1
LP6
230
J92-2
LP6+
+24V to the optional Forward Right Working Light (LP6) from SW28. If not present, check fuse F11, wiring, and connections. Note: Option must be enabled in FlashWare. Verify jumper is installed under dash if no switch is installed.
+24V
SW28
LP6
231
J93-1
LP5+
+24V to the optional Rotating Lamp (LP5) from SW27. If not present, check fuse F8, wiring, and connections. Note: Option must be enabled in FlashWare. Verify jumper is installed under dash if no switch is installed.
+24V
SW27
LP5
232
J93-2
LP7+
+24V to the optional Forward Left Working Light (LP7) from SW28. If not present, check fuse F11, wiring, and connections. Note: Option must be enabled in FlashWare. Verify jumper is installed under dash if no switch is installed.
+24V
SW28
LP7
Publication 1160093, Issued: 20 May 2013
8-67
