Guests - If You want access to member only forums on HSO. You will gain access only when you sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
Eckie

Trailer wiring question ~

8 posts in this topic

Recently installed new lights on my trailer, using the existing electrical harness that's on the trailer. Right side -- everything works - taillights, brakelights, blinker, side marker lights. Left side -- taillights and side marker light work. Brake and blinker light do not. Hooked up the left light blinker/brake wire to the right blinker/brake wire -- works fine.

So --- problem appears to be the left-side wire. I then by-passed the wire and spliced the blinker/brake light to the 4 prong adaptor ---- still no go.

Guessing that the issue must be the 4 prong connector? Can't think it could be anything else, due to process of elimination, but any takers on something I missed or should check?

Thanks!

Share this post


Link to post
Share on other sites

Take a test light and check the 4 prong connector. That way you can eliminate that step.

Share this post


Link to post
Share on other sites

It sure sounds like that's the issue.. I'd start with a testlight and start tracking it down from there.

marine_man

Share this post


Link to post
Share on other sites

When you bypassed the trailer wire and went straight to the 4-prong connector, did you still have the light grounded?

My whole thought from the beginning is that there is a grounding issue. 999 times out of 1000 times that's what it is. Usually, once I've eliminated the possibility of it being a grounding issue, it ends up being a grounding issue anyway.

Share this post


Link to post
Share on other sites

Skunked ~

Thinking back, I believe the light is/was grounded properly because I only disconnected the hot wire and ran a 20 ft bypass wire up to the connnectore, leaving the ground in place. The actual "taillight" still works -- just the blinker and brake light don't work.

If however, you are right, I then think I'm better off just buying a new harness/wires -- which also seems like a fairly straight forward task.

If I end up doing that -- where's a good place locally to buy trailer wiring harnesses?

Share this post


Link to post
Share on other sites

You can buy them at places like Fleet Farm. When I replaced the entire wire harness on my trailer two years ago, it didn't work correctly. I eventually discovered that the ground between the flasher mounting bolts and the frame was corroded. Therefore there wasn't a good ground and the lights acted funny.

Make sure that you've eliminated all grounding possibilities.

Share this post


Link to post
Share on other sites

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

This might help a bit. good luck Jeff

4%20way%20wiring.jpg

[note from admin: please read forum policy before posting again. thanks!]

Share this post


Link to post
Share on other sites

Honestly, if it was me, I would buy new wiring and redo the whole thing. I did that when I redid my wiring. Check the thread on boat wiring. I soldered all mine and it works so much better. Flawless for the last two years.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0