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Relay Board Functions
The following describes the components and func-
tions of each relay board.
Relay Board 1 (RB1)
1 - Flasher Power Light (Green): This light will be
illuminated when the turn signals or hazard
lights are activated.
1 light will be illuminated during right turn
signal operation
2 light will be illuminated during left turn
signal operation
3 light will be illuminated when clearance
lights are activated.
4 light will be flashing when the turn signals
or hazard lights are in operation.
NOTE: If circuit breakers (CB13 & CB15) are in the
off position, no warning will be noticed until the
clearance light switch is turned ON.
1 - Flasher Module card
2 - 12.5 amp circuit breakers (CB13, CB14, CB15)
4 - Relays
Right Turn Light Relay (K1)
Left Turn Light Relay (K2)
Clearance Lights Relay (K3)
Flasher Relay (K4)
Relay Board 3 (RB3)
1 - Light Module Display card
1 - Rev Light (Green): This light is illuminated
whenever the directional control lever is in the
REVERSE position and the key switch is in the
ON position.
4 - 12.5 amp circuit breakers
(CB16, CB17, CB18, CB19)
4 - Relays
Manual Backup Lights Relay (K1)
Stop Lights Relay (K2)
Retard Lights Relay (K3)
Backup Lights & Horn Relay(K4)
D03036 10/06
Relay Board 4 (RB4)
1 - Steering Pressure Bleed Down Timer Module
1 - Bleed Down Light (Green): This light is
3 - 12.5 amp circuit breakers (CB20, CB21, CB22)
4 - Relays
Relay Board 5 (RB5)
1 - Light Display Module card
1 - Lights Control Light (Green): This light is
5 - 12.5 amp circuit breakers
4 - Relays
24VDC Electrical System Components
card
illuminated when the bleeddown solenoid is
being energized. The bleeddown timer will
energize the solenoid for 90 seconds after the
key switch is turned OFF.
Parking Brake Failure Relay (K1)
Engine Cranking Oil Pressure Interlock
Relay (K2)
Horn Relay (K3)
Body Up Relay (K4)
illuminated when 24 volts is being supplied to
the battery terminal of the light switch.
(CB23, CB24, CB25, CB26, CB27)
Left Low Beam Relay (K1)
Right Low Beam Relay (K2)
Left High Beam Relay (K3)
Right High Beam Relay (K4)
D3-13
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