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Post by nafario on Jul 17, 2017 1:33:00 GMT
Removed wiring harnesses from my 1999 miata donor, connected the brake light assemblies to the wiring harness plugs.
Then I hooked up the battery and to my surprise the brake lights came on without switching them on. Also when I engage the brake pedal switch the brake lights go out. Please help.
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Post by buildercg on Jul 17, 2017 2:20:49 GMT
You'll be surprised what one missing ground can do. You have everything properly grounded?
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Post by nafario on Jul 17, 2017 3:11:40 GMT
Thanks for the response, I will check and connect all grounds.
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Post by gwnwar on Jul 17, 2017 4:40:06 GMT
What year is the donor??? Please see my red/white/blue in my signature line.. OEM there was one ground for the tail/brake lamps.. What lamp units are you using.. You have a multi meter and test light. If not you can get each cheap at Harbor Fright.. Check this for wiring and other info.. www.mellens.net/mazda/ |
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Post by kiwicanfly on Jul 17, 2017 5:29:01 GMT
Strange as it might sound this exactly how my Rocket brake lights work.
The switch is a normally closed switch so when not pressed the lights work, pressing, or engaging, the switch opens the circuit and the lights go out. It mounted on the brake pedal itself.
Any chance you are looking at a similar arrangement?
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Post by nafario on Jul 17, 2017 20:30:03 GMT
The donor is a 1999 miata. Without drl.
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Post by calibuild on Jul 18, 2017 3:56:44 GMT
Couple questions, and realize these don't seem related... but it's electrical!  Are the plugs all stock plugs or is there any chance the wires got reversed (happened to me on the headlights)? Are the brake lights LED's (in which case you may need resistors)? Do the reverse lights work as expected? Fuses all look good? All the wires are appropriately wrapped, so it's not jumping power / ground between cables? The brake sensor (where the pedal pushes it in to cause the lights to come on, that is hooked up correctly? Just brainstorming, wish there was a more direct answer. Wiring is weird, the plus side is the solution generally ends up being financially cheap, although time expensive. |
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Post by nafario on Jul 19, 2017 4:28:05 GMT
Wow, where to begin. The wiring and lights are stock, my intention is just to test before trimming the harness. I just ordered a brake pedal switch for 6 bucks, so stay tuned.
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Are the plugs all stock plugs or is there any chance the wires got reversed (happened to me on the headlights)? Are the brake lights LED's (in which case you may need resistors)? Do the reverse lights work as expected? Fuses all look good? All the wires are appropriately wrapped, so it's not jumping power / ground between cables? The brake sensor (where the pedal pushes it in to cause the lights to come on, that is hooked up correctly? Just brainstorming, wish there was a more direct answer.