GMC 1976 ZEO 6083 Maintenance Manual page 680

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ONAN MOTOR GENERATOR

K2 contact is defective . Replace printed circuit board .

Jumper terminal 7 to 1 . Does engine crank?

Start switch S3 is defective . Replace printed circuit board .

Jumper from S terminal of 1311 starter motor to positive (+) . Does engine

Replace K1 start solenoid .

Starter is defective . Remove and perform tests listed in STARTING

SYSTEM section and/or replace starter.

Replace battery .

ENGINE CRANKS BUT DOES NOT START

Is F1 fuse on control board OK?

Replace with an identical 5 amp fuse . Correct problem which caused fuse

to burn . (NOTE : Remote control leads maybe shorted or grounded) .

While engine cranks, check K1-I start solenoid voltage . Is 12 volts present

between terminals 10 and 1?

Replace K1 start solenoid .

Jumper terminals 9 to 11 . Does engine start when start switch is pushed?

K2 contacts are defective . Replace printed circuit board .

Fuel solenoid K4 must be open during starting and running . Remove fuel

line from carburetor. Does fuel pulsate from line when start switch is

WARNING : Use extreme care for tests 7B and 8B . Direct the fuel flow into

a suitable container and make sure area is well ventilated to prevent

accumulation of gasoline fumes.

Disconnect fuel solenoid from line and check fuel pump E2 . Pump will

click when operating properly . Does fuel pulsate from pump (solenoid

disconnected) when start switch is pushed?

Fuel pump (or wiring) is defective and must be replaced .

Fuel solenoid is defective and must be replaced .

Is electric choke closed when engine is cranking?

Voltage at choke terminal when engine is cranking should be 12 volts . If

choke does not move (at room temperature) with 12 volts applied, replace

it . Also check wire from choke to control for shorts to ground.

The fault is in the ignition system . Check points, plugs, wires and coil .

Refer to IGNITION section .

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