Does anyone know where the trailer parking light relay is on a 2000 F350 Diesel? Both the reverse and parking lights are not working at my trailer connector. The only reference is to the instrument panel and it is not under the dash or in the power distibution block under the hood. I have found the reverse relay under the hood but cannot find the parking relay.

 

The trailer marker lights are on a fuse. I don't remember the fuse location, but look in the manual, it should be a 20 amp mini fuse.

 

if the reverse lights dont work from the connector i would check to see if you even have a trailer reverse light relay from the factory, mine didnt. they are in the small relay boxes next to the main fuse box under the hood. it should be the set closest to the firewall

 

All relays are in under the hood (reverse, etc). I believe it is somewhere in the instrument panel, can't find it in the manual, under the hood or in the fuse panel under the dash

 

Not trying to be rude or anything, but did you check the trailer park light fuse in the fuse block?
It may not be your problem, but that is usually what blows first when the lights go out!

 

Checked all the fuses. All good. I have had this problem since I bought the truck about a year ago and tapped a wire from the rear clearance lights for the time being. I bought a bigger trailer with a lot of parking lights and don't want them on the same circuit anymore. (possible overload)

 

Oh Ok...Well that trailer light relay Doesn't come installed from the factory..It is usually dealer installed when the brake controller is installed..
I would see if the relay is even in there..and it will be under the hood..I belive there is a relay box next to the Master cyl.. It holds two relays I think...one may be missing.
If so, any trailer dealer or Ford dealer can hook you up..or look at it for ya..

 

Yes look to the fuse box on the fender well next to the master cylinder as fomocofan stated

 

Here are the relay's part number

FOAB-14B192-AA both relays same