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#1 |
Registered User
![]() Join Date: Jul 2021
Location: McKinney, Texas
Posts: 17
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No left brake light only when headlights are on
I am having the following issue and would appreciate some insight from anyone that has dealt with this in the past. With my headlights or running lights off, my hazards, turn signals and brake lights work, but the left brake light is dim. My turn signals also blink at the same speed. With the headlights or brake lights on, the left turn signal blinks slowly and the left brake light does not come on at all. I have replaced the turn signal switch (twice) and brake light switch, checked the connections under the dash; gone through the grounds for the taillights (wire brushed ensuring metal on metal contact), running lights, headlights, and battery; and inspected the harness from the firewall all the way to the taillights...all to no avail. I did notice that my truck is missing the big ground straps from the valve cover gasket to the firewall, from the cab to the frame, and from the bed to the frame. I have ordered those and will install them to see if that helps. Has anyone had any luck fixing this type of issue doing something different than I have done above? TYIA.
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#2 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,535
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Re: No left brake light only when headlights are on
Since you said your left brake light is dim, I'm wondering if you have the dim (tail light filament) and bright (brake/turn signal filament) wires swapped on your left light assembly.
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#3 |
Registered User
Join Date: Jun 2016
Location: West Palm Beach, Florida
Posts: 295
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Re: No left brake light only when headlights are on
I had almost the exact same issue a few months back. I added a ground wire from each Brake Light and Parking light to the frame, and added a ground wire from the battery to the frame and all was fixed.
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#4 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,924
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Re: No left brake light only when headlights are on
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__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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