2003 tahoe no crank no start

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nonickatall

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proceed logically first.

Identify the relay for the starter and measure with a multimeter on the starter relay socket whether there is power when you try to start the ignition switch.

If there is no power, you have a problem with the immobilizer, the ignition lock, the ECM or whatever.

If there is power there but, not at the starter motor, you have a problem with the relay, the starter motor, ground points or something else.

Check that first and let us know what the result is.
 

strutaeng

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I've seen those test relays with manual switches. Basically, remove the regular delay and plug the test relay, hit the switch and it should energize the circuit. Probably an overkill for a DIYer, but eliminates the switch side of the circuit very easily and fast.

Lisle makes a master relay kit, but spendy. I think Amazon may sell the knock-off versions individually.

Does anyone know the relay type on these trucks? There's only like 2 types, right?
 

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