Gmc :: 2003 - Brake Lights Do Not Work / Battery Meter Flucuates When A/C Is Turned On
Dec 8, 2012
2003 GMC - SIERRA 1500 / 5.3 L / 4X4 / Z71 Package
Installed NEW BATTERY and Alternator. The truck has fluctuating idle and battery meter when A/C turns on OR you lower all windows at one time.
Tail Lights work but Brake Lights DO NOT. Dual A/C = Left side only throws cold on COLD and room temp at HOT. / Left Side - Fluctuates on all temps goes back and forth with no movement mostly HOT or Warm even on COLD ?
ALL FUSES WORK ... NO FUSES BLOWN
A/C , Truck Idle, and Battery Meter went BAD after I had my Oil Pan Gasket replaced having to Lift Motor due to the truck being 4X4 and mechanic let the battery die for a couple days due to him leaving inside lights on.....
Brake lights have been bad BEFORE ALL THIS HAPPENED....
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Brake lights on my 2003 1.8 do not work. This includes the third light in the rear window. I've checked the fuses and bulbs and they're ok. The car recently was in the dealer for the re-call on the in-tank fuel pump. Is there something that I'm overlooking.
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This has been driving nuts for 2 days.... Brake lights dont work. Either pushing pedal or turning on lights. Turn signals work just fine.
Cab/cargo/3rd brake light on back of cab doesn't work either. I have checked/done the following:
- Checked Brake pedal switch for continuity. Tested fine.
- put multi meter on wiring all the way back to brake lights. No drop in voltage.
- changed bulbs. #3157 dual filament.
- positioned steering wheel all the way up and all the way down as suggested on here. No change.
- checked multi function switch (turn signal switch) for wiring issues. None found.
- kicked rear quarter panel for caveman adjustment out of frustration. No change.
What am I missing?
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The brief information:
1. Stuck/non moving in traffic on the freeway for roughly 1 1/2. During that time the AC was running, but once I noticed my "battery light" on the dash turn on, I turned everything off.
2. Since then while on my way home from work the voltage meter only showed barely 12 volts at full throttle.
3. I charged my battteries, and started it up today to go into work. While going to work the voltage meter showed 14 at its high point, but shortly there after it dropped back down to 12. At which time the battery light came back on.
New battery or alternator?
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The brake lights stay on when I turn the lights on. If the light switch is off they work fine. Is this a brake switch? Or something else.....
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I found out last night that all 3 of my brake lights are out. However, my tail lights work, and my turn-signals work. So obviously its not a big wiring deal. I was looking for the brake switch but i don't know where its at because i looked underneath. What fuse is the brake lights cause my manual doesn't have it listed. I drive a 04 Elantra GLS.
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My brake lights will not work but all other lights do, bulbs and fuse have been replaced.
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1997 F150 Supercab, 4.6L V8
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Noticed when I press brake pedal brake lights does not work even the center one. Checked all fused in the car and the small ones under the hood. All fine. I have a long trip tomorrow. Where else i can look. Everything seems working. Reverse light is fine. Is that related to latest brake light switch recall? Cant think of anything else.
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