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Jul 21st, 2025 | | | | Joined: Jan 2010 Posts: 378 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 378 | Once again hello to everyone. Does anyone have any idea why the dash lights come on when I apply my brake pedal? This truck is "home" wired, the way I bought it and I've got everything else right but this one has me fooled. By the way, I installed a cut-off switch right away just in case something happened. Thanks for reading. Any help will be wonderful. Steven | | | | | Joined: Nov 2009 Posts: 239 'Bolter | | 'Bolter Joined: Nov 2009 Posts: 239 | Hi Steven,
My truck was doing exactly the same thing and it was home wired also. I couldn't trace it down so I placed a zenor diode on each tail light wire to resolve the issue. I plan to rewire it this summer, but it was a quick fix.
Dale
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
-Unknown-
| | | | | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | My guess is bad grounds at the tail light housings, and/or may need a ground strap between bed and frame. | | | | | Joined: Jan 2010 Posts: 378 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 378 | Thanks fellers, I'll try both ideas. Steven | | | | | Joined: Oct 2007 Posts: 63 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2007 Posts: 63 | had a similar problem before where the tail light circuit is powered up on the application of the brakes . problem faulty tail light with a short between brake and tail sending 12v back into the tail light / dash light circuit. fix on hotrod with custom lights was to install diode to stop feedback easier than fixing custom lights. That's where I would start at the tail lights isolate one at a time to figure which one it is. Tail lights should be the only place where these two cicuits brakes and tail lights are close together | | | | | Joined: May 2001 Posts: 7,440 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,440 | "...with a short between brake and tail sending 12v back into the tail light ..."
There is not a "short" between brake and tail light. The filaments are connected to a common ground terminal. If the bulb is not properly grounded the 12V travels across the tail light filament seeking a ground, which in your case apparently it found it after traveling to the switch and the dash light circuit. | | |
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