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Old 06-01-2012, 10:15 AM   #1
The Rabid Whippet
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Default Brake light wiring with 3 wire turn signal help.

Anyone have a wiring diagram how you can make a 3 wire turn signal and brake light switch work? I have the Easy wire kit and everything works except the brake lights. Since the turn signal uses the same filament as the brake, how can I wire it up so the brakes work and the flasher works on the blinker at the same time?
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Old 06-01-2012, 11:19 AM   #2
1971BB427
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Default Re: Brake light wiring with 3 wire turn signal help.

Search came up with this:
http://www.jalopyjournal.com/forum/s...ad.php?t=90100
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Old 06-01-2012, 11:22 AM   #3
JohnEvans
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Default Re: Brake light wiring with 3 wire turn signal help.

You need a a 6-7 wire switch or add seperate bulbs for either stop or turn.
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Old 06-01-2012, 11:53 AM   #4
tommy
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Default Re: Brake light wiring with 3 wire turn signal help.

Quote:
Originally Posted by JohnEvans View Post
You need a a 6-7 wire switch or add seperate bulbs for either stop or turn.
I just add dedicated turn signal lights for the rear as John says. It gives me an excuse to add some cool early lights. I can't stand motorcycle lights but an earl turn signal switch deserves some early lights to make it work.



These are mine that I believe are actually cowl lights with painted bulbs.
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Old 06-01-2012, 12:01 PM   #5
Lobucrod
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Default Re: Brake light wiring with 3 wire turn signal help.

If you have a 3 wire turn signal switch then you will need separate turn signals and brake lights but it can be done with some relays.
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Old 06-01-2012, 12:05 PM   #6
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Default Re: Brake light wiring with 3 wire turn signal help.

I wired both brake lights together and the third brake light on its own dedicated circuit....no problems whatsoever !
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Old 06-01-2012, 02:24 PM   #7
bobj49f2
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Default Re: Brake light wiring with 3 wire turn signal help.

If you're using a aftermarket switch it's easy. Just tap into the wire after the brake light and before your flasher relay:

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Old 06-01-2012, 05:30 PM   #8
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Default Re: Brake light wiring with 3 wire turn signal help.

Quote:
Originally Posted by bobj49f2 View Post
If you're using a aftermarket switch it's easy. Just tap into the wire after the brake light and before your flasher relay:

cool diagram, but that is not a three wire switch.
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Old 06-01-2012, 07:06 PM   #9
The Rabid Whippet
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Default Re: Brake light wiring with 3 wire turn signal help.

I have a 7 wire but I can't stand the cheap chinese crap out there. I figured that the 3 wire with the auto cancelling wheel was cool. And I'm sure not going to run two extra lights on a 1936 Ford coupe. Looks like the cheap 7 wire chinese crap will do for now as I want to get cruising!!!!! The brake lights are the only thing holding me from driving my car.
And thanks for that diagram, it will help.
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Old 06-01-2012, 07:54 PM   #10
tb33anda3rd
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Default Re: Brake light wiring with 3 wire turn signal help.

there are cool old 7 wire switches out there. wire it with plug connectors so when you find an old one you can change it.
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Old 06-01-2012, 08:07 PM   #11
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I run a 3 wire with single bulb taillights. Go to the auto parts store they make adapter you use for trailers works perfect about 20 bucks.
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Old 06-01-2012, 08:14 PM   #12
F&J
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Default Re: Brake light wiring with 3 wire turn signal help.

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Originally Posted by superchargednailhead View Post
I run a 3 wire with single bulb taillights. Go to the auto parts store they make adapter you use for trailers works perfect about 20 bucks.

Yes, that's what I was thinking. They had made those years ago, back when only the foreign cars had a seperate T/S rear bulb,..... so USA owners could use a normal wired trailer.
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Old 06-01-2012, 08:28 PM   #13
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Default Re: Brake light wiring with 3 wire turn signal help.

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Originally Posted by F&J View Post
Yes, that's what I was thinking. They had made those years ago, back when only the foreign cars had a seperate T/S rear bulb,..... so USA owners could use a normal wired trailer.

It is called a Tail light converter. Joins stop and tailights together like how a normal domestic old car would be. But when the turn is on and the brake lights are on, that side will flash and not be over ridden by the brake light.

How does using a single filament bulb in this application work?



I think the OP can use this converter with success but only with using the standard dual fillament bulb.


Wire up your switch you have as instructed to do so. Wire your brake lights switch as instructed and the converter will have five inputs, L TURN, R TURN, BRAKE LIGHTS, TAIL LIGHTS, GROUND. Runs your wires into the converter and coming out of the converter will be four wires. L Turn/Brake , R Turn/Brake, Tail lights, Ground.

At this point run your wires to the rear lights. At this point you can't run the wires to the front turn signals as they will light up when you brake.

IF you want to run front turn signals, splice into the left and right turn outputs of your switch and wire forward to turn signals before you connect to the converter. You may or may not have to put in a diode after your splice to prevent back feeding from the converter.


Does this make sense?
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Old 06-01-2012, 09:00 PM   #14
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You can't use single filament bulbs. What are you running for taillights the other option would be to add a bulb to your taillight if you could fit it.
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Old 06-01-2012, 10:17 PM   #15
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Default Re: Brake light wiring with 3 wire turn signal help.

It is very simple to use your three wire signal switch to control four (5) pin Bosch type relays and achieve what you want. One pair to switch between turn signal and brake light function on the rear lights and the other pair to either operate the front signals if you have dual element bulbs, or to switch between park lights and signals if you have single element
front lights.

It has been my experience that the "trailer converters" do not hold up in day-to-day service.

We tried to use them when mounting U.S. wired bodies to foreign cab/chassis when they first started to show up in the market.
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Old 06-01-2012, 10:25 PM   #16
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Default Re: Brake light wiring with 3 wire turn signal help.

Quote:
Originally Posted by superchargednailhead View Post
You can't use single filament bulbs. What are you running for taillights the other option would be to add a bulb to your taillight if you could fit it.




Gotcha, I miss read and took single bulb, for single filament. I always measure twice, I should just read twice
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Old 06-01-2012, 10:33 PM   #17
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Default Re: Brake light wiring with 3 wire turn signal help.

It has been my experience that the "trailer converters" do not hold up in day-to-day service.



I own a trailer hitch shop and have been doing it for years. Your statement holds water. I have had the best luck with the Drawtite 119130 part number the best.

I pay about 17 dollars for them, while I can get some below ten dollars they just suck. As long as there are no shorts in the wiring after the converter the drawtite ones seem to last several years. But if you have any bare wires or shorts downstream of the converter it will fry it immediately and lose that circuit.

I have often wondered how the "factory OEM" turn signal switches seem to last decades in cars and trucks, but the aftermarked converter, which basically does the same thing, is quite a bit more fragile.
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Old 06-01-2012, 10:37 PM   #18
3quarter32
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Default Re: Brake light wiring with 3 wire turn signal help.

I just put diodes in the brake light wires to stop backfeed thru the turn lights. Works fine.
Lee
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Old 06-02-2012, 12:29 AM   #19
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Default Re: Brake light wiring with 3 wire turn signal help.

Quote:
Originally Posted by 3quarter32 View Post
I just put diodes in the brake light wires to stop backfeed thru the turn lights. Works fine.
Lee
While this prevents the back feed so both blinkers don't go at the same time,
I believe this will only work when your blinker is on or brake lights are on, but not at the same time. Your blinker wont blink if you step on the brake. The solid signal from the stoplight switch overrides the flash of the signal.

Correct?
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Old 06-02-2012, 03:18 PM   #20
RICH B
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Default Re: Brake light wiring with 3 wire turn signal help.

Drew up a couple of quick schematics for using 5 pin relays with an old time
three wire signal switch. One if you have double contact front park/signal lights and one for single contact front park lights.

If you have a pilot light in your signal switch, you could use a 3 prong flasher or
combine the the left and right front outputs through diodes to light it.
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File Type: pdf 3 wire signal switch diagram pdf.pdf (19.7 KB, 1033 views)
File Type: pdf 3 wire signal switch with park lights pdf.pdf (20.1 KB, 791 views)
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