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Author Topic:   trailer lights
garya posted 05-21-2002 11:46 AM ET (US)   Profile for garya   Send Email to garya  
I just rewired my trailer, everything works fine other than the brake lights. When the brakes are applied all lights go out. I'm sure there is a simple fix, I just can't seam to figure it out.

The trailer restore work is only part of a complete restore for a 1976 Montauk. The boat and trailer have been completley striped and rebuilt. The trailer is now done and I just placed the repainted boat on it. Once the lights are safe, I can move the boat for final work.

This is my first boat and my kids and I are egger to finish the project and get fishing.

kingfish posted 05-21-2002 11:53 AM ET (US)     Profile for kingfish  Send Email to kingfish     
Check your grounding for good clean contact.


garya posted 05-21-2002 12:15 PM ET (US)     Profile for garya  Send Email to garya     
kingfish, thanks for the reply. I quickly checked my grounds last night in the dark and couldn't find the problem. I plan on doing it again today for each and every light. Can one poorly grounded light cause all the lights to go out?
where2 posted 05-21-2002 01:02 PM ET (US)     Profile for where2  Send Email to where2     
If your parking lights are on, and everything goes out when you press on the brake, you have no ground connection between the outer flange of the light socket, and the white wire in the trailer plug connector at the hitch end of the trailer. If you find that you have continuity to the hitch end of the trailer, then the white wire on the tow vehicle is the problem.

Ground problems will do this, I see it as I am driving behind people all the time at night. Tail lights on both side of the car work fine. Hit the brakes and one side of the car goes out, ground problem on that side. Both sides go out, no bulb grounds at all.

I once had to explain this to an electrical engineer...

sport15er posted 05-21-2002 04:05 PM ET (US)     Profile for sport15er  Send Email to sport15er     
I had a similar problem recently after replacing all of my trailer lights,(on newly primed & painted brackets). Be sure all of your ground connections are hitting on bare metal.
DJS posted 05-22-2002 09:29 AM ET (US)     Profile for DJS  Send Email to DJS     

If you are depending on your hitch coupler to make a ground because it is touching your metal hitch ball, you will have nothing but trouble. You must ground to the trailer frame and the frame of the towing vehicle.


garya posted 05-24-2002 10:21 AM ET (US)     Profile for garya  Send Email to garya     
Finally got a chance to work on the light problem and sure enough, it was a ground problem. Thanks for the help

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