Check your alternator, diode could be bad Hello I am not a mechanic but had a similar problem with my f-150 -- had a lot of work done on it - computer replaced, new alternator, new battery. Finally I took it to a stereo place thinking that my alarm might be draining it. The master mind at that place located 2 fuse problems in under 30 mins -- one for a battery saver option on my truck and the other for the dome light. That was only $50 compared to the $800 I had already spent to not find the problem - so that might be something you want to try before wasting a lot of money like i did. good luck
Probably a stuck relay.
check the battery or battery cables or the alternator or starter
Same thing happened to me, I just tightened my + and - battery terminals and it worked. Hope it's that simple for you!
Dead battery
There are several things that can keep a Chevy Tahoe from starting including the starter being bad, a dead battery, an alternator, or a fuel pump.
Could be a shorted wire, or bad battery.
A lot of the time Chevy used aluminum battery cables in their cars,(in particular my 1980) I was continually having starting and battery problems until I replaced the cables with copper.
First check battery it was on its side also, do headlights work when starting engine if not replace battery.
the starter may not be good or the connection on the starter may be loose
how to replace a 1990 Chevy Beretta battery
Bad alternator? May have short, will still charge, but drains the battery when sitting. Just as a test, take one of the battery cables off at night and see if the battery stays charged. Might be bad battery even though new. Hood light that's not shuting off? Brake switch not shutting off? Have you checked the altermator to make sure it's charging 14 amps. May be weak and only charging enough to keep the truck running with nothing left to charge the battery. Out of ideas
Could be, bad battery, bad starter, in need of tune up, need more info.