Bought me a 16' enclosed trailer. It has the 7 prong plug. It has interior 12volt lights. Went to go turn them on and nothing. I thought it was the trailer lights not working, so I plugged it into my father in-laws F350 and they work. So what I figured out is that my 2005 f150 factory plug is not wired up for this option. So what has to be done to have working lights?

 

Do you have a brake controller? Do you have the trailer fuses and relays installed?

https://www.f150online.com/forums/to...locations.html

 

Your fuse is not installed for the aux charge line.
If you look at the truck plug it is the one located in the 1 o'clock position. It should be hot when the key is on. If it is not you need to locate and install the correct fuse/relay.

 

Do you know the amperage for the fuse?

 

Yes I have a brake controller. Don't know what you are talking about as for relays and fuse??? So the 2000 f150's are the same as the 05's?

 

Read farther down in the thread - SSCULLY included diagrams for his 06 which should be like your 05.

 

Ya i am in need of relay #5. Anyone have a napa part number? nearest autozone is in min.

 

Went to my local ford dealer to get my oil changed. When there I asked for one. They gave it to me for free. Since I go there for my oil changes.