Like someone said in an earlier post you may wanna try tapping it while trying to start and see if it does anything. Or you could just check the voltage that it is sending to the starter while someone is turning it over.

 

If your battery is dropping to 4-5 V in the start position, then the battery is shot or the starter motor has a serious problem.

Have you tried charging the battery?

 

It could be a bad cell in the battery. Do you have access to another one that you can swap out real quick? Like another truck.

 

Tried, no change

 

Yes I have charged the battery.

Pulled the battery and starter out of the Tahoe and took them be tested. Both tested good.

 

No, But I can try to jump it. I’m going to put it back together and try to jump start it. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
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Any idea what the voltage should be to the small wire attached to the solenoid<o></o>