Utility trailer lights work except brake lights


Old 08-29-08, 09:03 AM
Thread Starter
Join Date: Aug 2008
Location: Pennsylvania
Posts: 13
Utility trailer lights work except brake lights

Just bought a used 5x8 utility trailer. i put in all new light bulbs, hooked up to the vehicle last night. Turn signals work, running lights work. Brake lights work when vehicle lights are off, however, when vehicle lights are on and brake pedal is depressed the lights on the trailer go out. The trailer light connector is a circular 6 slot with solid pin center. Anyone have a recommendation to correct? Thank you.
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Old 08-29-08, 10:05 AM
GregH's Avatar
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Location: Manitoba
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You first need to disconnect the trailer connector from the vehicle and figure out which colored wires give you ground, left signal, right signal, park and brake.
On your 6 pin connector you should also have power and brake.

Once you know which wires are which on the vehicle you then have to match up the trailer connector wires.
A battery charger with a couple of pieces of wire make this easier.
Also, make sure you have a good ground through the connector and that the trailer chassis and the connections at the lights all have a good ground.

There is a standardized color code for trailer wiring but so many diy mechanics ignore this it becomes frustrating when you try to use the coding without checking the wires first.
Old 09-03-08, 01:34 PM
Thread Starter
Join Date: Aug 2008
Location: Pennsylvania
Posts: 13
GREG, thank you. I thought the 6 pin "male" trailer plug was already a standard set up to fit any 6 pin vehicle plug. If the ground was not good, are you saying it may only affect the trailer lights when braking? and not other functions? I'll try the battery charger method and see if I can figure out which slot is for what functions on the trailer plug. I am sure somewhere in the vehicle manual or on the vehicle plug is the details for each slot.
Old 09-03-08, 08:59 PM
Speedwrench's Avatar
Join Date: Apr 2008
Location: Oklahoma
Posts: 1,698
if the lights work until you step on the brakes one or your problems is bad or poor ground. look on http://www.etrailer.com/faq_wiring.aspx
they have very good diagrams and info.

life begins when the kids leave home and the dog dies
Old 09-04-08, 07:11 AM
Thread Starter
Join Date: Aug 2008
Location: Pennsylvania
Posts: 13
Thank you speedwrench, this was terrific information.
Old 09-05-08, 05:13 AM
Join Date: Sep 2008
Location: N E Lincolnshire
Posts: 1
You should go with Greg, i think he has perfect solution for your problem...

Jackson White
N E Lincolnshire, UK

Last edited by GregH; 09-05-08 at 04:47 PM. Reason: Remove company name...........not permitted

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