my 05 f150 running lights work fine, but my 4 wire flat does not have any power for the running lights, both blinkers work fine. i checked my fuses on the passenger side floorboard, and every one seemed fine. any ideas? this is killing me since i pull a trailer every day for work.....

 

Ok so this may be stupid... but i've done it before. Are the running lights on your truck on? Because i believe they need to be on for the ones on the trailer to be on.... If you already know this i don't mean to insult your intelligence

 

yeah they are on i tested it with a test light and also hooked the trailer up to my brothers truck and every light worked fine. so it definately something on my truck...

 

Oh.. sorry i couldn't help much

 

Your turn signals work on the trailer right? Then i would check running light wire from both your tail lights and to your trailer hook up.

 

fuse 1.10 in the cjb. That wound be fuse # 10 in the under hood junction block, powers the trailer tow relay.

 

Just info for you, my 02 shows a trailer tow relay in the battery junction box. Its called trailer tow parking lamp relay in the diagram (running lites). Check your owners manual for its location.