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Taillight Wiring question

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Old Jun 19, 2020 | 10:11 AM
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Taillight Wiring question

I am wiring my taillights and have a question. I'm sure this is an easy for most of you but not for me. LOL My reproduction tail lights have two wires. Black and Green. Is one the turn signal the other the tail light? Which is which? My body harness has three wires terminating at the rear axle. Tail Lt Ckt, RH Turn Sig, and LH Turn Sig, I assume the LH Turn Sig goes directly to left taillight. RH Turn Sig goes directly to right taillight. and Tail Lt Ckt splits at axle and goes to both tail lights? Thanks in advance, Dave



 
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Old Jun 19, 2020 | 10:19 AM
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Well now, good question. I wonder if it matters.
Based on this diagram, it looks like green goes to the stop light switch.
That is just the back half of the diagram. I have the full thing as pdf. Oh, it looks like the pdf is in the post. Hopefully it will work for you to see the whole thing.
As I said before, I used a lot of different resources to figure out my wiring. No one source seems to have everything you need.


 
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Old Jun 19, 2020 | 10:29 AM
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Originally Posted by Harrier
Well now, good question. I wonder if it matters.
Based on this diagram, it looks like green goes to the stop light switch.
That is just the back half of the diagram. I have the full thing as pdf. Oh, it looks like the pdf is in the post. Hopefully it will work for you to see the whole thing.
As I said before, I used a lot of different resources to figure out my wiring. No one source seems to have everything you need.
Thanks Joe! I like all your pretty diagrams but I only see two wires coming back to the tail lights? I see nothing about turn signals! Are you still using your left arm to indicate your intentions.


 
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Old Jun 19, 2020 | 11:22 AM
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What turn signal switch are you using? If you have a 7 wire switch where the brake lights go through the turn signal switch, you only need 3 wires going to the back, as the brake and turn lights use the same wire and are controlled through the switch.

As for which wire is which coming from the lamp, it's easy enough to verify. Ground the lamp body to the neg terminal on a 12v battery, then touch the wires to the positive side and watch the bulb. The bright side is the brake/turn, the dim one is the tail.
 
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Old Jun 19, 2020 | 11:26 AM
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Originally Posted by df85732
Thanks Joe! I like all your pretty diagrams but I only see two wires coming back to the tail lights? I see nothing about turn signals! Are you still using your left arm to indicate your intentions.
Well actually, I'm having issues with my turn signals at the moment, probably grounds. I've been too lazy to dig into it lately....Well, having my truck in the shop waiting for parts doesn't help either.
So, that diagram shows colors, the other one shows how it wires into turn signals.
You will see two wires going back to the lights from the turn signals. Then one wire going from the headlight switch back. The stoplight switch goes from power (my fuse panel) to the turn signal wires.


Confused yet?
Now here is a simpler diagram without turn signals.


Then I built this one with turn signals and getting power from the headlight switch. Stock, the headlight switch is the fuse panel for everything


Now here is a diagram showing what all the connectors on the headlight switch go to.


OK, by now, you either love me, hate me or both.



 
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Old Jun 19, 2020 | 11:52 AM
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Disregarding colors, as those would be for this particular switch, this is the wiring diagram for the turn signals integrated with the brake lights.

 
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Old Jun 19, 2020 | 12:20 PM
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On your taillights, one wire is tail lights, the other wire is turn/brake light. Ground is through the body, believe it or not with all the painted surfaces. To easily determine which wire is for what simply use a battery or battery charger, ground to body and touch the positive to each wire, one at a time. The wire that creates a brighter light is the turn/brake light wire. The wire creating the dimmer light is the tail light wire.
 
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Old Jun 19, 2020 | 01:05 PM
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Thanks guys. Just tested with my 6 volt battery. The green wire is brake/turn signal (brighter light) Black is tail light (dimmer light) You guys are awesome 😊
 
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Old Jun 19, 2020 | 01:21 PM
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Dave, did your truck have separate lamps for the turnsignals before you tore it apart? Did it have the turn signal switch added to the steering column like a Signal Stat switch? If yes to one or both questions, then you'll need separate turn signal lamps in the rear. If your truck has factory turn signals then the tail light can serve as tail/brake/turn light.

I had to retain my separate turn signal lights in the rear on my 54.

 
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Old Jun 19, 2020 | 04:03 PM
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Dave here is the add on TS switch on my 54. Looks like I have to repaint it again.

 
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Old Jun 19, 2020 | 04:14 PM
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No Abe, my truck had factory turn signals. I was able to get tail lights today but I cannot get turn signals until I get it connected to the steering column. I think I got it figured out. I'm on hold right now because I want to use original fittings so I'll have to order some of those. This electrical is kicking my butt but I will overcome. LOL
 
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Old Jun 19, 2020 | 04:18 PM
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That's good, Dave. You'll get it. Just think it through.
 
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