Trailer Lights Not Working When Headlights are Turned On with a 2003 Mazda Tribute

Updated 04/30/2012 | Published 04/28/2012

Question:

I purchased part # 118343 and installed in my mazda tribute 2003 as per instructions. When my headlight is off, break and turn signals work fine in my trailer. But, when I turn on the headlights nothing works. Any help would be appreciated.

asked by: Jay

Expert Reply:

It sounds like there could be one of two possible problems. First, it could be a ground issue. A weak ground can cause all sorts of issues. Make sure the ground for the converter is attached to a clean and corrosion free bare metal surface. If it already is, try moving the ground to a different location.

You will also want to check the trailer side connector and wiring. If there is corrosion build up on the trailer connector that could cause problems. Make sure to check the main ground from the trailer connector and the grounds for the lights. They should all be attached to clean, corrosion free metal surfaces.

The other possibility is that having the running lights on is too much power draw for the system to handle. If the trailer has a lot of clearance lights, it could be too much power draw which is causing the lights not to work. Do not exceed lower of towing manufacturer rating or the following: Max. stop/turn light: 1 per side (2.1 amps) and Max. tail lights: (4.2 amps).

expert reply by: Michael H