My trailer
Lights are not working. I have brake
Lights and blinkers just no running lights. Also my jack will not lift or lower when hooked up to truck. Any suggestions?

 

Welcome to the site..

What year and series of truck?

 

Sorry about! 2014 F250. I know the fuse was blown. We swapped it out with another 30 amp fuse and still no lights. Also noticed that the electric trailer jack wasn't working too. I am thinking that it is that relay. Hooked my neighbors F250 to it and everything worked fine. Any help would be greatly appreciated. Thanks

 

The 30 amp (F26-30) in the Battery Junction Box is circuit protection on the 'load side' (trailers running lamps) on the Trailer Tow Relay within the BJB.

Inside the Battery Control Module (BCM) is another 'non serviceable' relay that controls the 'coil side' or magnetic switch of the BJB's Trailer Tow Relay. It has a 15 amp Fuse (F30-15) within the BCM that should be checked as well.

The trailer jack feed is through the stock 7 way trailer adapter?
F90-25amp in the BJB is load protection for the Trailer Battery Charge (if that's where the jack is getting it power distribution) as well as F55-10amp for the Battery Charge Relay coil protection. If all the fuses check out, could try and swap the Trailer Tow and Battery Charge relays positions and see if there's any change..

That said,,
Fuses normally blow for a reason,

 

Thanks for the reply. I did notice water in my plug after I noticed no lights. I am guessing that cause my fuse to blow. I will check the ones that you have stated. Thanks again for the reply