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| 3rd brake light wiring question (Page 1/1) |
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Wichita
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SEP 25, 08:49 PM
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I have an 85, so it didn't come with a 3rd brake light. I'm planning on wiring one in.
My question is for those who have 86 and later and with sunroofs and who has taken off the headliner.
Curious about how the factory wires the brake lights. Does it go around the sunroof and into the dome light? or does it go down one of the front pillars either passenger or driver side?
Any help on this would be awesome.
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fierosound
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SEP 26, 11:31 AM
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Wiring is in the driver's side body harness to the rear window defogger.
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My World of Wheels Winners (Click on links below)
3.4L Supercharged 87 GT and Super Duty 4 Indy #163[This message has been edited by fierosound (edited 09-26-2020).]
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Wichita
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SEP 26, 12:31 PM
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| quote | Originally posted by fierosound:
Wiring is in the driver's side body harness to the rear window defogger.
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Thank you for that. This is what I needed.
Maybe I can find a wiring harness in decent condition from pick yard. If not , I can run new wires.
Where did you find that diagram picture?
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Spadesluck
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SEP 26, 01:13 PM
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Personally I would wire it yourself. Much easier that trying to find a harness that may or may not be in good shape. It is only two wires.
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fierosound
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SEP 26, 08:55 PM
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| quote | Originally posted by Wichita:
Where did you find that diagram picture? |
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Factory Service Manual - end of Section 8A starting at 200's pages
Body harnesses also shown in Section 10J of FSM.
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theogre
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SEP 27, 02:09 AM
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If you wire this...
Ground can go to frame near by.
Hot wire needs direct wire to white or other wire on the pedal.
Even if you get OE wires for 86+, 84/85 dash isn't wired to use 3rd brake light and likely those plugs won't match and plugin to the rest.
889 High brake bulb uses same socket as many "driving/fog" bulbs so maybe find thru dorman etc.
But Do Not use "driving/fog" bulbs or can melt or have a fire quick.------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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darbysan
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SEP 27, 10:41 AM
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Since you are adding the light, go the extra step and replace the bulb with an LED replacement bulb. Takes a lot less power, and creates a lot less heat.
You can also add in a flasher that blinks the light a few times before it goes solid. Sort of like this idea. Here's a source, although you can find some cheaper on Amazon or Ebay. I like this company's product, especially their "delay" product. It flashes a few times, then goes solid. If you re-apply your brake within 8 seconds of releasing it, like in stop and go traffic, it does not flash- just goes solid. Won't drive the people behind you crazy.
http://kahtec.com/
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'87 GT , '00 3800 Series II SC, 4t65e, Vue Power Steering. (SOLD)
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fierosound
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SEP 27, 02:22 PM
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darbysan
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SEP 30, 10:54 AM
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theogre
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SEP 30, 07:00 PM
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"BMTxms Canbus 881 LED" and related saying CANBUS uses "high watt" surface mounted resistor(s) that will get hot and can fry the "bulb" at minimum.
More so if you're stuck in slow or stop/go traffic or used them for taillight etc on for a long time as parking lights are.
Example: Smokin' hot CANbus LED lamps. (230C in open air.) YT
If the parts don't "melt" outright, LED themselves don't last long when hot.
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