Installing 3rd brake light in trailer.
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Installing 3rd brake light in trailer.
I was just wondering if this is possible to do on my trailer. It is made of a truck box and has a topper on it so it is quite high and I would like to put a 3rd brake light up there for added safety. The only problem is that I can't figure out how to have it function as just a brake light, since the brake signal is carried on the same wire as the signal lights. And I can not run a wire from my truck because I use different trucks to tow it, so it has to be spliced in with my trailer harness.
Oh, and it is 4-pin flat set up. So is there any way I could do this without having it blink when my signal light goes on?
Oh, and it is 4-pin flat set up. So is there any way I could do this without having it blink when my signal light goes on?
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Ok, I am thinking now that I will just hook it up and have it flash when I am signalling. So now my question is... can I run one wire from the left signal light wire and one from the right signal wire and twist them into one wire where I hook into the new brake light and have it flash when I turn left AND when I turn right? Or does that make any sense?
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Joined: Jan 2000
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From: Along Lake Erie
If you do that, the blinkers will probably still work alone, but when they try to flash and you're hitting the brakes, some weird things could happen..... They may not work at all, or may work weird depending on how they're wired-up.
I think I remember seeing that module in the JC Whitney catalog.... it was a third brake light you could retrofit to older vehicles that didn't come equipped with them from the factory. They would have had the same problem.....
Bingo!
http://www.jcwhitney.com/autoparts/P...=brake%20light
That's what you're looking for. Give them a call!
-Joe
I think I remember seeing that module in the JC Whitney catalog.... it was a third brake light you could retrofit to older vehicles that didn't come equipped with them from the factory. They would have had the same problem.....
Bingo!
http://www.jcwhitney.com/autoparts/P...=brake%20light
That's what you're looking for. Give them a call!
-Joe
Last edited by GIJoeCam; Jun 6, 2005 at 08:11 AM. Reason: additional info
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Joined: Jan 2000
Posts: 3,205
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From: Along Lake Erie
ummm, I'm not sure how that wire setup worked exactly as I'm unclear on what exactly you did.
The extra three wires on the 7-pin plug are supposed to be for switched 12-volt power, reverse signal, and the trailer brake circuit. The light for a cap either uses a converter similar to the one I linked above tied into both taillights, or simply uses a jumper from the OEM light on the back of the cab.
There's absolutely no reason that the converter shouldn't work. I've seen them used numerous times for third brake lights back in the early days when they first became mandatory. Some of the high mount stoplights came with them already built right in.
-Joe
The extra three wires on the 7-pin plug are supposed to be for switched 12-volt power, reverse signal, and the trailer brake circuit. The light for a cap either uses a converter similar to the one I linked above tied into both taillights, or simply uses a jumper from the OEM light on the back of the cab.
There's absolutely no reason that the converter shouldn't work. I've seen them used numerous times for third brake lights back in the early days when they first became mandatory. Some of the high mount stoplights came with them already built right in.
-Joe