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Steven Watkins

Steven ... 7/10/2012

1998 GMC C1500 Sierra SLE 8 Cyl 5.70L


Truck will not start.

Intermittent problem. Occurs only couple times a year. New battery, all terminals clean. Turn ignition to on and all gauges turn on as usual. Can here fuel pump turn on. Turn ignition to start and there is no click, no sound, nothing. Same thing if trying to start in neutral. If I leave it for a day or two it will start like normal and run fine.

1 Answer


CVO 7/10/2012

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First, check the battery and starter cables for their tightness or free of corrosion and physical damaged.

See this Starting system simplified diagram. Have a help from an assistant to crank the engine, use a 12 volt light tester or a digital voltmeter, apply it to the starter control circuit.
If there is light or 12 volts and the starter isn't cranking, then the starter is the culprit. Have the starter to bench test for free at the local auto parts stores.
If there isn't no light or no volts, then the ignition switch is the culprit.( may not be the case, but test it ).


Note: a 3/4 charge battery is 12.50 volts
A discharge battery is 11.75 volts.
A battery under a cranking load and it is reading less than 7 volts,it will be a recycled ( junk ) battery.


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