No trailer running lights

Rambodog

5,107 posts · Joined 2015

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#2 · Jun 25, 2017

I have had fuses look good and test bad. Use a voltmeter's continuity setting to be sure. The DRL circuit wouldn't be related to parking lights. Start in the rear and work your way back to power source with a voltmeter. At some point the power exists and then doesn't and that's what your looking for. It can be tough to follow harnesses, but here is a schematic of your parking circuit to help.
http://www.revbase.com/BBBMotor/Wd/Down ... ?id=878958

 

Jasen

2,878 posts · Joined 2016

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#3 · Jun 25, 2017

^ Same here, pulled my hair out for days :|

 

capt4903

19 posts · Joined 2012

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#4 · Jun 26, 2017

can't tell by the posts, but there are separate fuses for the trucks lighting/turn signals and trailer running lights/signals.....located under the hood.....
I pinched my trailer cable and blew left turn signal fuse...checked the truck fuse, ok.....done a little checking and found the separate fuses for trailer......

 

E

Eastbound and down

7 posts · Joined 2017

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#5 · Jun 27, 2017

I had this problem a few weeks ago on my 2500hd. I found a bunch of corrosion on the prongs in the plug. I pulled it apart at the hitch and cleaned it all up and put some dielectric grease on everything and put it back together. Worked great after that.

 

Z

zap

122 posts · Joined 2015

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#6 · Jul 21, 2017

A couple of things to check. Ohm out the fuse or check it with a test light on both sides. I have a fuse somewhere in my pickup I pulled out of a pursuit edition Ram…the upfitter fused a 50W radio (pulls 12A) with a 5A fuse. Slowly cooked the fuse as the radio affiliated.

Check voltage at the back. Apply external voltage to the running light pin on the trailer to see if the lights come up.

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