TP-6735 7/17 55Section 4 Controller
4.12 Controller Circuit Board
4.12.1 Relays and LEDs
The K1 flash, K2 crank, and K3 run (fuel) relays are
located on the controller’s logic board. The CRANK and
RUN LEDs are associated with relays 2 and 3 and are
visible in the service access area on the front of the
controller assembly. See Figure 4-15.
The RUN and CRANK LEDs indicate power to the
corresponding relay. If the LED is illuminated but the
relay is not activated, the relay is faulty.
Power to the governor stepper motor is tied to the K3 run
relay. If the stepper motor does not operate, check the
K3 relay.
The individual relays are not replaceable. If one or more
relays are faulty, replace the controller.
4.12.2 Controller Fuse F2
The controller board is protected by a 7.5-amp fuse (F2)
located on the controller. If the fuse blows repeatedly,
disconnect the following leads one at a time to identify
the cause of the blown fuse:
D Lead 70A at the fuel valve
D Lead IGN at the ignition module
D Lead 71 at the starter relay
D Leads FP and FN at the rotor
Repair or replace the component causing the blown
fuse.
1. Controller’s service access area
2. Run LED (K3) and crank LED (K2)
3. Controller fuse F2
4. K1 flash relay
5. K2 crank relay
6. K3 run relay
2
GM62865
3
4
65
Service Access Area
1
Figure 4-15 Relays and LEDs on Controller Circuit Board
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