ok this is really strange ,, never had a issue till today !!! put new tires on it ,, they started it up backed it up was fine. I started it up put in drive fine. BUT when I pull out the headlight switch it died. Would not restart no headlights,pannel lights or parking lights. factory radio made noise but display wouldn't work.

Had tripple A tow it how ,, driver droped it off tried to start didn't I went to rool it down I figured what the hell tried again it started fine put in gear fine ,, turned on headlights died again.

When it acts up the service engine light will not come on neither willl the factory radio display. No headlights, parking lights of dome. cranks fine no fire.

could it be the ECM or the headlight switch or combo of both??


it is a 94 G20 chevy van cargo only option is AC and am/fm radio never had issues with lights before 5.7 350 V8 auto.

 

it does have the flat 4 towing plug which I am going to check in the day light to see if it is grounding out

 

Pull all your lights and look for a short.

 

replaced the switch and it is better ,, right now cleaning the neg cable contact

 

be sure to check the ground strap between the engine and body....
Also have your battery and alternator load tested...

 

had battery and alt tested battery bad and alt ok so new battery and went ahead replaced both headlights with much better ones ,, now working on the whinshield washers

 

Well sat for a few days and did it again ,, cranks fine but if the dome lights do not come on ,, it wont start!! dome lights and headlights don't work and check engine light wont come on... gonna let it sit again and see if it cranks up again.
Was running started fine pulled out headlight switch and died .. now cranks no start no check engine light

 

shiped it off to the mechanic ,, new fuel pump and relay drove it home and died again LOL not even a mile drive !!!

 

Thanks ended up being a wire behind the battery !! at least all they charged me for was the fuel pump and relay ,, but it is a GM so new fuel pump is never a bad thing LOL