Hi guys...I have a 2007 FX4 5.4 and am installing a prodigy brake controller.

I have the factory harness which plugs into the prodigy but where is the truck's plug?

I believe it is under the dash on the right side of the driver. There are a lot of wires there! Where exactly is it and what does it look like?

Thanks

 

Its above the parking brake pedal.....don't forget to put the relay in on the passenger side.....there should have been a kit in your glove box when you bought the truck...

 

Thanks Ryan ...I looked by the parking brake but don't see an unused plug. Do I need to remove any plastic to access it?

 

As you look at your dash it is on the right side. Under the dash right above the factory plug in slot. The plug faces the door. Easy plug & play.

That is a good brake controller. I have used mine for a few years and never any problems.

The brake contoller should have come with a wireharnass that plugs directly into the truck.

If you need I can take a picture at lunch.

 

Thanks! A picture would be really appreciated!

 

the little grey plug is shown somewhere around 07:30 on this video.....hope it helps

Brake Controller Installation - 2008 Ford F150 - etrailer.com

 

Once I find the elusive plug. What do I do with the relay?

 

The relay goes in the relay box....if i recall it was behind the passenger side kick plate....but i don't have the page saying what slot....anyone else???

 

The plug is gray this is looking back



The is looking up




I think the relay is for R05, which is for the "trailer tow battry charge" which uses the truck alternater to charge any batterys on your camper/boat etc. but your trailer has to be set up for that. Yes the fuse box is on pass side kick panel

 

Thanks a lot for the pics. I will have a look tonight.

 

ok ..I have the plug located and the Ford harness that came with the truck. The instructions that came with the harness show 6 wires to connect to the controller, one of which is a red one labeled " bat". There is no mention of a relay in the intructions and no other wiring included, so I assume that the Ford plug is already wired to the fusebox and no additional relay is needed. In other words true plug and play. Am I right?

Thanks for your help on this guys.

 

If I recall the relay was for battery charging for any trailer batteries only....someone here should be able to answer that for sure...

 

I have purchased a used 06 Lariat and it did not come with the wiring harness or fuse so I don't know if it is already installed. If someone could let me know the size of the fuse and which socket it goes in so I can check, that would be great.

 

Fuses 10,36,42 & 106 all have to do with trailer lights but should all be installed from factory.

Relay R05 is for the "Tow Battery Charger" which I don't think comes installed from factory so you might not have that one but don't need it unless your trailer is wired for this and has some kind of batteries like a camper.

The fuse box cover has a diagram with the fuse/relay numbers and locations.

The wire harness is for a brake controller if your trailer has electric brakes.

 

Thanks very much, R05 is the one I was looking for. I will check that tomorrow.