I have a Chevy S10 and just recently the Running light dont come on when I start the vehicle, they dont come on, and when I turn them on from in the truck they still dont come on. Then a couple hours later, I start the truck and they come on, and if I stop the truck and then start it, they wont come on. I tried changing the fuse, but that didn't help. I brought it to a shop and they tried tracing the wiring, but couldn't find the problem. So I hope you can give me an option....
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Not a regular fuse for headlights. Usually a relay that trips if it overheats and resets when it cools off. Often under the hood. Probably means you have a short circuit somewhere. A hot wire touching ground , often at rear of vehicle, Are your tailights still on ? If headlights and taillights go off together then problem is definately a short.
your power starts at the brake light fuse,check with a test light,then proceed to stop light switch on brake pedal under dash,one wire will be hot when when you check it with your test light, the other won't be until you press down the brake pedal then the power flows through to the second wire,if no power to second wire replace switch,if you have power remove tail light bulbs and check for power in side socket.
maybe something shorting out drawing power did u have alt tested before switching out to make sure it was bad- sum auto stores such as auto zone/advanced auto can do a load test on vehicle for free will show if their is an excess draw on elect or if new alt is faulty (does happen) check serpentine belt and pulleys belt may be slipping then check ground strap , starter for draw or some other accessory
Check the mass air flow sensor. Unplug it, then try to start the engine. If it starts and runs ok replace the sensor. Make sure the wiring is good to the sensor, The wires may break inside the covering near the connector ends.
Your vehicle as an ignition control module located on top of the distributor (under the cap and rotor) I would pull the ICM and take it to NAPA and have it tested if bad replace it (cost about $80). Sounds like a ICM problem or it could be the ignition switch located on the steering coloum which can't be tested but costs $20. Hope this works
it can be done....Start the truck and look at key cylinder under those covers of the seering column. There is a yellow wire that runs to it....CUT IT...Lol...really after its running cut that yellow wire..Just member to look at the key cylinder. you will see very small yellow wire and black and maybe a white....Cut the yellow on and it kills the factory antitheft. however the light wil be on the dash that says anti theft. If you are so inclined just take the dash panel out and remove he bulb. I did...