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Old February 17th, 2006, 01:42 AM   #1
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Rear signals to brake mod question

I was wondering if anyone with a coupe modified their rear signals to double as additional brake lights? What I want to do is make the signals light up when I apply the brakes, but wish to retain their signaling function. Is this possible, and how can it be accomplished??
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Old February 17th, 2006, 11:17 AM   #2
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this is pretty dangerous unless you have red turn signals in the rear.

one way to do it is with relays. im thinking its also possible with some diodes, but id have to think about that one
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Old February 17th, 2006, 12:43 PM   #3
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Well, I have a coupe, so all the lights are red in the rear except for the reverse lights which I'm leaving alone. Why would that be dangerous? Electrical issues?
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Old February 17th, 2006, 02:02 PM   #4
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its not dangerous, lots of trucks have this because they have small tailights, you would probably have to use some sort of relay so that when you push both brake and signal, the signal side will blink while hte other side will stay on

just make sure you dont make a short in your electrical system
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Old February 17th, 2006, 03:04 PM   #5
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thought about it some more, and this SHOULD be very simple, requiring no additional hardware (besides some wire, tape, connectors).

the following directions assume that both the turn signal (+) and brake (+) can be used as floating grounds, which means that they act as grounds when they accept an inverse voltage. if not, then this wont work. if so, then it will work just the way u want

(1) cut the ground wire for your turn signal. note: make sure u CUT the wire apart COMPLETELY. do not "tap into" it.
(2) on the BULB side of the cut, attach a new wire
(3) run the new wire to your brake (+) wire, and splice it in

and thats it. all you're basically doing is replacing the turn bulb's ground wire with a hot wire from the brake light.
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Old February 18th, 2006, 12:44 AM   #6
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Quote:
Originally Posted by sumptimwong:

the following directions assume that both the turn signal (+) and brake (+) can be used as floating grounds, which means that they act as grounds when they accept an inverse voltage. if not, then this wont work. if so, then it will work just the way u want

(1) cut the ground wire for your turn signal. note: make sure u CUT the wire apart COMPLETELY. do not "tap into" it.
(2) on the BULB side of the cut, attach a new wire
(3) run the new wire to your brake (+) wire, and splice it in

and thats it. all you're basically doing is replacing the turn bulb's ground wire with a hot wire from the brake light.
Thanks for taking the time to think this through. I will try to do the mod in the coming week and let everyone know how it goes.
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Old February 18th, 2006, 12:57 AM   #7
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yea dude, and take pics too! im sure a handful of people are curious as to how this turns out. 05 sedan guys can use this too
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