all lights go out 5 minutes down the road?

Asked by Jan 11, 2014 at 06:11 AM

Question type: Maintenance & Repair

when the truck is running and driving lights were on and working. 5 minutes or so later, all lights/electronics shut off in the truck yet continued to run the engine. letting go of the gas pedal turned on everything temporarily, then shut back off when pushing on the gas one time. after that the lights stayed off, and the engine continued running and driving. wiring? maybe? its a 1989 gmc sierra 2500.

1 Answer

125

Is this truck carb or fuel injection? I had a situation with a carb car where the sense wire on the alternator was not plugged in and the car was running on straight battery. As I drove it slowly drained the battery and the lights dimmed, eventually the radio died but it ran like a top. This took about 20-30 minutes More than likely you have a bad connection to the body harness. Typically the engine and body harness are separated. Pushing the gas is probably jerking the vehicle such that it can make the connection again. Hit a pot hole it goes out. Try to find a rough road and drive down it a few times. Do the electronics come and go as you hit the bumps? Further more, if they all go out, I would focus on the ground circuit first. Typically everything is run to a common ground. You may find it has rusted off or been compromised.

Your Answer

Add photo

Related Questions

  • 2008 truck stalls going down road

    truck stalls going down road wait a few seconds starts back up and runs for 10 seconds then stalls again changed the fuel pump same thing happed

    2008 GMC Sierra 1500 Work Truck Ext. Cab 4WD

    -

    Maintenance & Repair

  • CONTINOUS DYING WHEN GOING DOWN ROAD 1 answer

    HAVE A 2000 GMC SONOMA,,, REPLACED FUEL FLEX,,,REPLACED GAS SENSOR,, REPLACED BATTERY,,,LITES FLICKER CONSTANTLY,,,,,CANNOT KEEP STARTED,,, SOMETIMES RUNS WELL, SOMETIMES DIES AND I CAN RESTART UNTIL...

    GMC Sonoma

    -

    Maintenance & Repair

  • Battery light comes on driving down the road. 1 answer

    Battery light comes on driving down the road including brake warning light and ABS light. Had alternator (new last year) and battery (new this year) checked with now issues on either. Not sure if ther...

    2000 GMC Sierra 1500 SLE Extended Cab SB

    -

    Maintenance & Repair

  • 2000 GMC 2500 Sierra Dash Light Issue 1 answer

    HELP! This is driving me and my dealer crazy. My dads 2000 GMC truck has been doing the following and the dealer can not find the issue. Driving down the road and the following dash lights come on...

    2000 GMC C/K 2500 Series Crew Cab Short Bed 2WD

    -

    Maintenance & Repair

  • Car stalls going down road. Sometimes won't start after getting warm. 1 answer

    Noticed after filling up with gas that car won't start. Then after starting and driving a ways down road it will stall and take about 5 minutes to start. Doesn't do this all the time but starting to...

    1995 Mercury Sable 4 Dr LS Sedan

    -

    Maintenance & Repair

Search GMC Questions

GMC Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,500
#2 John Saffrahn
John Saffrahn
Reputation 3,930
#3 Richard Schroer
Richard Schroer
Reputation 3,350
View All