Archived Help! No trailer turn signals

[DaveHess]

I am on a road trip with my Jayco ft and have lost the right trailer turn signal and brake light. Checked underhood fuses. All good. Using a test light, I have no right turn signal at truck 7 pin. Right turn signal and brakes lights work on truck. Checked and swapped bulbs on tt , same results. Where is the fuse for tt turn signals on my 2003 Ram?

 

[BigPapa]

There's a thread on a similar issue here:

https://www.turbodieselregister.com/threads/255516-Trailer-Elect-Connection

I would suggest testing, or just replacing, fuse #46. It is for Left Trailer light, #47 is for the right. After testing/replacing fuse #46 check for voltage on the Yellow/Pink wire at the trailer connector. Looks like it starts as a Dark Green/White wire out of the IPM (basically the underhood fuse panel) if you can find it there.

If you still don't have voltage with the left turn signal on I'd say the built in relay is bad requiring a new IPM.

 

[jhenderson]

You can also check the bumper plug itself. Disconnect the wiring to the plug behind the bumper and look for corrosion.

 

[DaveHess]

Looks like it is the IPM. I am going to rebuild it. Can't afford to buy a new one.

 

[Kirwin]

On a 2003 it is called a Front Control Module vice an Integrated Power Module. It is located under under the Power Distribution Center (the underwood fuse box). It is available separately from the PDC. Not sure how you would rebuild it. It can can be reactivated using a DRB scan tool the Chrysler has up to 3 times. After that, as I understand, it its useless and must be replaced.

 

[DaveHess]

I am going to desolder the three 20A relays and replace them.