Trailer wiring not working
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Amateur
Joined: Feb 2019
Posts: 42
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Trailer wiring not working
92 Dakota trailer wiring
Has the t connector that mates with the tail light on each side then merged into one 4 pin connector.
The colors that are coming off are blue, brown, yellow, and green.
Connecter prong broke so I spliced on a new one.
The issues I’m having is when I hit the left indicator, the right on the trailer flashes. Same with the other side.
When I swap turn signal wires, the correct info start synchronizes with the trailer light. However, both left and right are faintly blinking simultaneously.
Brake lights on the trailer do not work as well.
Trailer was produced in 02/2020.
Pictures:
https://imgur.com/a/8yC7oa4
Video:
https://imgur.com/a/0mZfrRf
Has the t connector that mates with the tail light on each side then merged into one 4 pin connector.
The colors that are coming off are blue, brown, yellow, and green.
Connecter prong broke so I spliced on a new one.
The issues I’m having is when I hit the left indicator, the right on the trailer flashes. Same with the other side.
When I swap turn signal wires, the correct info start synchronizes with the trailer light. However, both left and right are faintly blinking simultaneously.
Brake lights on the trailer do not work as well.
Trailer was produced in 02/2020.
Pictures:
https://imgur.com/a/8yC7oa4
Video:
https://imgur.com/a/0mZfrRf
Champion
Joined: Sep 2013
Posts: 2,724
Likes: 153
Is it grounded well? I've never used my trailer wiring harness but I know it has a ground wire right there at the back end.
Get some Ospho and spray that rusty frame to convert that rust. It is about $20 gallon. Put something under to catch the drips. It leaves a white film where it dries. The rust will turn to a black oxide.
Get some Ospho and spray that rusty frame to convert that rust. It is about $20 gallon. Put something under to catch the drips. It leaves a white film where it dries. The rust will turn to a black oxide.
Champion
Joined: Jan 2013
Posts: 4,737
Likes: 374
From: Northwest Louisiana
It does sound like you messed up the wiring a bit; and that the ground is janky.
(That shows because both light up dimly and you don't get any brake light; the right turn goes right turn --> disconnected ground --> left turn --> truck's left turn --> good ground ; the left turn, swap left and right. That's why it's dim; you're trying to light 3 bulbs, so each is getting like 4.6 to 5 volts, instead of the 13.5 to 14.4 or so with the motor running.)
Ground could also be through parking lights not the truck's turn signal light; that does the same effect, although the voltage is a bit higher on the turn signal filaments (and you won't be able to tell for sure unless you watch the bulb!)
Fix your ground first, work from there.
I'll add that for under $23, plus shipping, you can get a complete new harness and avoid this fighting. https://www.etrailer.com/t1-1992_Dodge_Dakota.htm
EDIT: I'd HIGHLY recommend also adding something like this to help protect that connector: I've got one to put on when I put my T-connector back on the truck; I just haven't taken the time to (am still looking for a better rear bumper first!)
RwP
(That shows because both light up dimly and you don't get any brake light; the right turn goes right turn --> disconnected ground --> left turn --> truck's left turn --> good ground ; the left turn, swap left and right. That's why it's dim; you're trying to light 3 bulbs, so each is getting like 4.6 to 5 volts, instead of the 13.5 to 14.4 or so with the motor running.)
Ground could also be through parking lights not the truck's turn signal light; that does the same effect, although the voltage is a bit higher on the turn signal filaments (and you won't be able to tell for sure unless you watch the bulb!)
Fix your ground first, work from there.
I'll add that for under $23, plus shipping, you can get a complete new harness and avoid this fighting. https://www.etrailer.com/t1-1992_Dodge_Dakota.htm
EDIT: I'd HIGHLY recommend also adding something like this to help protect that connector: I've got one to put on when I put my T-connector back on the truck; I just haven't taken the time to (am still looking for a better rear bumper first!)
RwP
Last edited by RalphP; Mar 7, 2020 at 10:08 AM.