Interesting problem with trailer lights


Old 02-09-15, 06:11 PM
Thread Starter
Join Date: Aug 2013
Location: Usa
Posts: 5
Interesting problem with trailer lights

Here's my scenario: 6-pin connector on a 23 foot trailer. With truck parking lights off, turn signals, and brake lights on trailer work fine. With parking lights on, all markers and tail/brake/blinkers work except the lt rear tail light/blinker/brake light. (Since my markers work on the left side (except the left rear) I figure the problem is a short somewhere between the good marker and the lt rear tail light.) but I can't understand why the brake/turn signal light on that side only would stop working when the parking lights are turned on. Any thoughts?
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Old 02-09-15, 06:26 PM
Rough Rooster's Avatar
Join Date: Feb 2014
Location: USA
Posts: 381
Bad ground.
Be sure each light and its socket are well grounded.
Travelled that road many times and it is nearly always the ground.
Very seldom will you have both filaments in a two filament bulb shorted together.

Old 02-10-15, 08:01 AM
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Join Date: Mar 2003
Location: NC, USA
Posts: 18,291
Like Rooster said....

When in doubt I always go for the ground first. Sometimes it can be extra confusing when the ground wire attachment or pin in the connector is bad and the trailer is getting it's ground through the hitch ball.

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