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Old January 24th, 2010, 10:26 AM   #1
xNewhaven11
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Default Trailer lights not working right.

I recently ran new wires on my trailer because the old ones only worked sometimes since they were getting old. After hooking the new wires up the lights stay on solid and only flash very dimly, you wouldn't be able to even tell unless you really looked.

I ran a ground wire from each light going to the frame, its not bare metal but there is no rust or anything.
If i cant figure it out i will grind it down and try to touch it to the bare metal.

When i turn my headlights on, they are solid.
When i brake, nothing happens,
When i use a turn signal, they barely work,
When the lights are off on the truck, they don't work at all.


Any other ideas of why its doing this?
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Old January 24th, 2010, 10:37 AM   #2
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bad ground between the vehicle and the trailer !!!!!!
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Old January 24th, 2010, 11:20 AM   #3
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Wired a new 7-pin connector to try that, still having the same problem.
What else can i do to mess with the ground?
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Old January 24th, 2010, 11:35 AM   #4
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clean the frame for the grounds
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Old January 24th, 2010, 12:13 PM   #5
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alotta trailers ground through the hitch make sure its clean inside where the ball goes in an make sure ball is clean
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Old January 24th, 2010, 10:30 PM   #6
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sounds to me like your lights are hooked up backwards...you have the brake/turn lights wired as the running lights, and the running lights (which are much dimmer) wired as the brake/turn lights

what does it do when you turn on the 4 ways, turn signals, or brake lights when the running/headlights are turned off?
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Old January 25th, 2010, 02:01 AM   #7
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Yeah sounds like a bad ground !!! A bad ground wire will make your lights do all sorts of crazy things !! Or it could be in the pig tail coming from your truck to trailer ? Those go bad all the time !!
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Old January 27th, 2010, 01:21 AM   #8
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Well, Any luck yet ??
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Old January 27th, 2010, 05:17 PM   #9
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Still working on it sadly, havent had much time but i am pretty close.
The connection on the truck was a little dirty and had some corrosion so i cleaned that off, Checked the 7 pin and re-wired that to match the truck again to make sure and cleaned the frame for the grounds perfect.
Still having the problems but i then narrowed it down to the harness between the lights.
Touched the wires around and i am pretty sure one wire was loose.
Tomrrow i am going to sotter and shrink tube it so i should be all set.

Will post results.
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Old February 21st, 2010, 11:39 PM   #10
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So, what was it ??
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Old February 21st, 2010, 11:46 PM   #11
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sounds like to me either the wires are hooked up backwards or the bulbs are in the sockets backwards, i know I've done them both with same result. if you have a bad ground if all else fails you could run your trailer ground wires right to the ground wire on your flat 4 connector or seven pin, which ever you end up using. that way as long as your trailer wiring on the car end is good, you'll have a good ground connection.
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Old March 2nd, 2010, 04:25 AM   #12
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Good call , never thought of doing it that way !! it would have to be a quick fix of coarse but it would work !!
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Old March 2nd, 2010, 06:38 AM   #13
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Quote:
Originally Posted by rider50 View Post
bad ground between the vehicle and the trailer !!!!!!
you dont need to be grounded between the trailer and vehicle
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Old March 2nd, 2010, 07:19 AM   #14
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Quote:
Originally Posted by j_little3 View Post
you dont need to be grounded between the trailer and vehicle
You sir don't know jack shit about trailer wiring.
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Old March 2nd, 2010, 07:36 AM   #15
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Quote:
Originally Posted by Nuggets View Post
You sir don't know jack shit about trailer wiring.
I work at a trailer place... You need a ground on the vehicle and the trailer connected through the plug.
I was thinking he was saying grounded together through the ball. Thats what you dont need.
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Old March 3rd, 2010, 07:25 AM   #16
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Quote:
Originally Posted by j_little3 View Post
I work at a trailer place... You need a ground on the vehicle and the trailer connected through the plug.
I was thinking he was saying grounded together through the ball. Thats what you dont need.

X2. The Terminal is what the trailer is supposed to be grounded through, not the ball. If the ball would need to be a good conductor it would need to be clean. If it was clean, it would squeak and wear down the ball. Not only that but then when ever you hit a Bump the lights flicker. The Ball (or part that goes on top of it) should be Lubricated lightly.

If it's a Ground issue then usually the Trailer lights will blink oppisite of the Tow Vehicle. This indicates the Electricity trying to get back to the Battery through the (+) side of the wiring. They should blink together. My dad had this old trailer that the wiring was a mess. I refurbished it a couple years ago. It's been great since.

Last edited by L4CX; March 3rd, 2010 at 07:30 AM.
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Old April 13th, 2010, 10:13 PM   #17
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Quote:
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you dont need to be grounded between the trailer and vehicle
^^^ of course you need to be grounded between trailer and vehicle.
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