vehicle wiring problem...need help

[bow slayer]

went to hook up the boat to the van to leave this morning and no trailer lights. I have determined there is no power coming out 4 way from van. This has been professionally wired in with a converter box,seems i get power and signal coming out 3 wires to drivers side but nothing from 4 wires going to passemger side coming out of the small black box. Just wondering if i spliced in a new box would this solve the problem? thanks

[Terry]

I don't know the unit but most times they just plug into the vehicles wiring harness , so one set of wires should be going into the box and the other wires should be going to the trailer and if the is the case it is pouched

[bow slayer]

seems i found the problem...there are no relays in fuse box for towing....tried CT and princess for relays and no luck ....anyone know where i could buy relay fuses ......thanks

[Bill Shearer]

If it is a Ford, the relay is usually shipped in the glove box. Don't know why they dont put it in?

At any rate my last 3 F150s came that way

Pick it up at the dealer tomorrow, or make a jumper for today. Beware though in the event of a short you could do some serious damage.

[Garnet]

Seems you found problem.

 

If they were previously working.

 

Ground, Ground, GROUND is usually the answer.

[archer379]

If its not the relys its that little black box i had mine in a caravan for a little over a year and it quit working had to replace it