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3rd brake light wiring question by Wichita
Started on: 09-25-2020 08:49 PM
Replies: 9 (330 views)
Last post by: theogre on 09-30-2020 07:00 PM
Wichita
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Report this Post09-25-2020 08:49 PM Click Here to See the Profile for WichitaSend a Private Message to WichitaEdit/Delete MessageReply w/QuoteDirect Link to This Post
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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Report this Post09-26-2020 11:31 AM Click Here to See the Profile for fierosoundClick Here to visit fierosound's HomePageSend a Private Message to fierosoundEdit/Delete MessageReply w/QuoteDirect Link to This Post
Wiring is in the driver's side body harness to the rear window defogger.



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[This message has been edited by fierosound (edited 09-26-2020).]

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Wichita
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Report this Post09-26-2020 12:31 PM Click Here to See the Profile for WichitaSend a Private Message to WichitaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by fierosound:

Wiring is in the driver's side body harness to the rear window defogger.




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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Report this Post09-26-2020 01:13 PM Click Here to See the Profile for SpadesluckSend a Private Message to SpadesluckEdit/Delete MessageReply w/QuoteDirect Link to This Post
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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Report this Post09-26-2020 08:55 PM Click Here to See the Profile for fierosoundClick Here to visit fierosound's HomePageSend a Private Message to fierosoundEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Wichita:

Where did you find that diagram picture?


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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Report this Post09-27-2020 02:09 AM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
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.

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darbysan
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Report this Post09-27-2020 10:41 AM Click Here to See the Profile for darbysanSend a Private Message to darbysanEdit/Delete MessageReply w/QuoteDirect Link to This Post
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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fierosound
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Report this Post09-27-2020 02:22 PM Click Here to See the Profile for fierosoundClick Here to visit fierosound's HomePageSend a Private Message to fierosoundEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by darbysan:

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.


They are a 889 bulb. Only Red LED ones I've seen are these.
https://www.ebay.com/itm/2p...Lights-/161998985583

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darbysan
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Report this Post09-30-2020 10:54 AM Click Here to See the Profile for darbysanSend a Private Message to darbysanEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by fierosound:


They are a 889 bulb. Only Red LED ones I've seen are these.
https://www.ebay.com/itm/2p...Lights-/161998985583


Can't remember where I found mine. Might have been Ebay, or Amazon. Saw these on Amazon today.
https://www.amazon.com/BMTx...id=1601477576&sr=8-5
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theogre
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Report this Post09-30-2020 07:00 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
"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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