My son has a 91 GMC Seirra 2500. His headlights were dim when he started his truck then would turn brighter after the truck was warmed up. Then the other night while he was driving they starting flickering. He turned the truck off when he got home and now the headlights won't turn on at all. It sounds like a short to me but where could the shortage be? He does have a PA system hooked into his cigarette lighter but I dont think that would effect the headlights because it has been turned off. Any suggestions?
You might look for a loose or corroded ground. Any problems with the horn or wiper wash motor? I assumed a 5.0L engine. Info I see says there is a ground splice point and a couple of common grounds. If those systems are affected, it would be even more likely. Check fuses as well.
SOURCE: 1985 gmc sierra truck headlights wont work. its not the bulbs
well we just fixed our truck it was a wire that connects to the starter had some out! might want to see if there are any wires disconnected there
SOURCE: 2000 GMC SIERRA SHIFTS HARD AFTER WARMUP.
Scan for any transmission codes If none are present, change the filter.
SOURCE: GMC Sierra Won't Start. Battery Good. Tried Jump
If you know the batter is good.
Check the Starter to see it is getting power.
Get a test light [6.00] and see if the starter will light up the test light.
If not - then you may need a new starter. From the sounds of it you might want to take it to a professional as this can be a very labor intense job because the starter has to come out the bottom.
SOURCE: 2006 gmc sierra 2500 duramax, Heater blower motor
could be the blower motor relay orthe blower motor resistor
SOURCE: 2002 gmc sierra won't start, security light came on
The security light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. Remember too, the TDM controls the security light. Sometimes you can have ALL the symptoms and no lights.
This link may help you.
http://vatspasslockpasskeysecurityhelp.yolasite.com/
58 views
Usually answered in minutes!
×