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Old 01-15-2023, 04:20 PM   #1 (permalink)
Cd
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1993 Cvic tail light to trailer light wire color question

I'd like to get a second opinion on this, since most Honda forums deal with direct tailight bolt in scenarios.
I have two trailer lights that I would like to connect to my tail lights, but they are just plain ol' red lights.
There are no amber turn signal, and no back up lights.

For the back up lights, I plan to use a seperate LED interior light, and just wire that in.

The LED trailer lights I have say RH side :
stop & turn ( green )
Tail ( brown )
The LH side light says Stop &turn ( yellow )
Tail ( brown )


Based on the attached photos, how should I wire this up ?

How would I wire in the LED interior light so that it lights when in reverse ?

Thanks






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Old 01-16-2023, 07:37 AM   #2 (permalink)
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The mounting studs provide the ground for the trailer lights. If you aren't bolting them into metal, you'll need to add a terminal and wire to ground them somewhere. You could tap into the car's harness, but any convenient spot on the body of the car is fine.

I looked at three different Honda manuals and the wire colors seem to be pretty much the same.

Red/black from the car goes to brown on both trailer lights.

Green/black is the backup lights, which you would connect to the positive wire on your LED light. The other wire from the LED light goes to ground.

You'll need a taillight converter if you want the trailer lights to act as both brake lights and turn signals. The converter output wires will match the trailer light wire colors. You could also get a pair of amber turn signals in addition to the trailer lights.

Brake = green/white

Right turn = green/yellow

Left turn = green/blue
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Cd (01-16-2023)
Old 01-16-2023, 01:29 PM   #3 (permalink)
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Thanks. I had just assumed that since the lights were advertised as stop / turn + tail lights, that they did not require buying something to make them function as turn signals.

Stamped on the lights, it says : LH Stop & Turn ( Yellow )
Tail ( Brown )
RH
Stop & Turn ( Green )
Tail ( brown )

That's a good tip about the grounding.
I was thinking that the white ground wire would work simply by connecting it to the black ground of the car.
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Old 01-16-2023, 02:09 PM   #4 (permalink)
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Quote:
Originally Posted by Cd View Post
That's a good tip about the grounding.
I was thinking that the white ground wire would work simply by connecting it to the black ground of the car.
Yeah, you're right. Sorry about that. I didn't notice the white ground wires! I don't think I've seen trailer lights with them.
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Old 01-16-2023, 02:14 PM   #5 (permalink)
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Quote:
Originally Posted by Cd View Post
Thanks. I had just assumed that since the lights were advertised as stop / turn + tail lights, that they did not require buying something to make them function as turn signals.
The problem is that American-style trailer lights are really outdated. Older vehicles don't need the converter because they use the same light for brake and turn.
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Old 01-16-2023, 06:52 PM   #6 (permalink)
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Thanks again. So you say older cars don't need the converter.
Is 1993 an 'old' car ? LOL
I looked up a bit on it, and read that you need a converter if you have seperate wires for stop and turn.
My lights have a single wire for both, a wire for tail lights, and a ground wire.

Though not ideal, I'm hoping the LED interior light ( ceiling light ) can be wired in to function as a reverse light.

Not sure how though.
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Old 01-16-2023, 10:48 PM   #7 (permalink)
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1993 is old (I guess), but it still has separate brake (red) and turn signal (amber) bulbs and wires. Imagine a 1985 Chevy pickup; one brake light blinks as a turn signal. You need the converter.



The LED interior can be used as a reverse light if it's bright enough. Positive lead to the green/black wire on your car, negative lead to the chassis or black wire.

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