Trailer hitch running light circuit not working??

[LXGus]

Anyone else have this problem? Left and right signal and break works, but running light isn't. Posting because I checked all 'TOW' fuses and not sure what to do next. This is on a 2015 LX570. Thanks!

 

[tbisaacs]

Anyone else have this problem? Left and right signal and break works, but running light isn't. Posting because I checked all 'TOW' fuses and not sure what to do next. This is on a 2015 LX570. Thanks!

Do you have a multimeter? The green wire on the tow plug is the running lights.

 

[CharlieS]

Seems like 9 times out of 10 trailer lights problems are the result of a ground issue. Grab a cheap trailer plug tester at the local auto parts or farm supply store to verify the vehicle side function to eliminate that from the equation.

 

[LXGus]

Seems like 9 times out of 10 trailer lights problems are the result of a ground issue. Grab a cheap trailer plug tester at the local auto parts or farm supply store to verify the vehicle side function to eliminate that from the equation.

Thanks! So far, I've found a blown relay on the vehicle. That's fixed and the vehicle connector is all working correctly. The relay being blown may have been caused by a ground issue on the trailer so that's my next step. Good call on that.