Trailer Light Problems

I'm not getting any turn signals or brake lights on boat trailer. all good on boat side as everything works on other truck. towed a rented equipment & smelled something burning under dash. checked fuses & relays under the hood & all good, no other problems with lights etc except towing lights.
is there another relay under the dash?
Any help much appreciated

 

Are all the pins wired correctly

 

yes, all worked as they should prior to rental

 

Seems the smell gives an indication that the integrated towing relay has failed. It's part of the Combination Meter (RMP, SPEED, FUEL, etc.)

 

integrated? meaning the whole unit would need replaced?

 

Correct

 

yikes..that might be above my pay grade! thanks for reply!

 

Easy to verify though. Remove the gauges surround frame, 4 bolts to remove the assembly, take a whiff and a visual check.

 

If you have a meter and a length of wire, check continuity between the trailer light grounds and the negative post of your battery. It isn't foolproof, but when dealing with trailer lighting issues, always assume you have a bad ground. You will usually save yourself some time.

 

I have running lights tho, ground should be good?

 

Yup...only one ground for ALL the towing circuits.

 

I rarely tow anything, wouldn't the old fashioned way of tapping into the taillight wires work? replacing combination meter going to be expensive

 

Verify first.
Remove and replace your scratched up instrument cluster plexiglass
If you were to "replace" the connector, you'll need to add an additional one and remove the old one from the bumper. Towing converter requires battery power also (can be tapped to oem tow circuit.)

 

You were right caribe! Much easier to remove than I expected. I could not smell anything but sure looks burnt

 

Of course he was!

You can even see where the magic smoke exited the device.

 

So, your choices:

1. New Combo Meter (dealer needs to set it up ((milage sticker)), but might not be necessary).
2. Old type rear light combiner 4 pin (separate of the oem one).
3. C10 intercept harness (goes into combination meter) with a 2nd Gen towing converter attached.

I'd choose a Combo Replacement.

 

Yeah that's what I'm thinking too. There chance odometer data stored someplace else?

 

Yes, but depending on Dealership, they could choose the sticker route, instead of programming it.