2000 Dodge Truck brake lights won't come on

2000 DODGE TRUCK
18,500 MILES • 6 CYL • 4WD • AUTOMATIC
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EANDERSON
  • MEMBER
  • 1 POST
My brake light won't come on. But if I use the brake control, for the trailer the lights will come on. I replaced the brake switch. and nothing. About 2 months ago I had a Dodge dealer install a new wiring harness, cause the old one was shorting out. I hope it is not the wiring harness, again.
Jul 23, 2008 at 4:20 AM
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KLSHIEL
  • ✓Experienced Mechanic
  • 163 POSTS
It is likelly something to do with that wiring in the back. I have seen that before where the only way to get any of the lights working is to hook up a trailer or hit an odd switch. The harness for a trailer is hooked up in paralell with the lights on your truck. Both get power from the same place, but they are grounded in different spots. When you hit the trailer control the power is looping around to a trailer ground. It is likely a bad ground for one of the lights in back, Check anything though as there my also be a short somewhere.
Jul 23, 2008 at 4:46 AM
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