View Single Post
  #3  
Old February 21st, 2017, 11:30 PM
James James is offline
-= Extreme Supporter =-
 
Join Date: Jun 2013
Location: Greer, SC
Truck: 1964 GMC 1500 2wd
Age: 69
Posts: 432
Rep Power: 199
James will become famous soon enoughJames will become famous soon enoughJames will become famous soon enough
Default Re: dash lights come on when I depress brake/no brake lights

I believe the problem is a grounding issue at the rear of the truck, or maybe between the bed and the frame. When you step on the brake the power travel through your brake light then through your tail light back the your dash light to ground. By not have a ground at the brake light it seek the ground through the tail light circuit. To check this theory place the truck in the garage with no visible light on (total darkness). Have someone step on the brake. The dash light will come on and while someone else is looking at the tail light it should glow very dimly (the current is limited by the bulbs in the dash). Or you can run a jumper wire from the battery ground (Negative terminal) to the base of the tail light and see if the problem goes away. The grounding problem can be cause by either the tail light assembly not making a good ground to the bed or the bed is not grounded to the frame (or maybe a little of both).

Hope this help.
Reply With Quote