Towing Package Questions
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Towing Package Questions
On my '06 Expedition XLT 5.4L I assume is a base towing package installed. Just bought a new bought and the trailer has disc brakes. The current adapter for the trailer lights is a 4-pin and the blue wire is taped to wiring harness. I purchased the 4-pin to 5-pin adapter to use with my trailer for the brakes and spliced the blue wires together. However, when I put the truck in reverse it doesn't unlock the brakes. I still have to get out and manually release the brakes before I can back up. Is there something else I should do in addition to splicing the blue wire? Thanks in advance!
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From: Fort Wayne, IN
Do you have a brake controller? There is a connector under the steering column where you can connect a brake controller. One like from Prodigy runs about 70-120$ depending on your channels.
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I don't have a clue. Do you have a link or a picture to show me where it would be, or would I know right away when I look under the steering column? I just assumed that since the blue wire was already attached to the harness that the power from the reverse activated a solenoid or something on the trailer to release the brakes. Not sure if this makes a difference or not, but I'm not very interested in making the brakes on the truck and trailer work together. More interested in the brakes on the trailer releasing when I put the truck in reverse.
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You would know if you have a brake controller, you'd see it. I'm not sure where the question about that is coming from. I get your question, though the safety interlock on the brakes isn't being deactivated. When you manually reset them, what do you do?
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From: Fort Wayne, IN
Doesn't the controller handle the safety interlock?
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From: Fort Wayne, IN
Hm I just read a very good thread on another forum. The person says that there was a fuse missing in the fusebox for the reverse circuit, which prevented the blue wire from getting its 12v when in reverse. Now that I remember, when I added a 7pin to my truck, I had to get relay for the aux 12v line, and a 20 amp fuse for the reverse circuit. Take out your manual and you'll probably see you're missing a fuse (i believe it's 103 or something like that), and it will be the trailer reverse circuit, and it requires 20 amps, that's what you need I think.
http://boards.trailerboats.com/cgi-b...c;f=7;t=001666
http://boards.trailerboats.com/cgi-b...c;f=7;t=001666
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To manually release the brakes I have to get out of the truck and turn a dial on the trailer tongue.
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Hm I just read a very good thread on another forum. The person says that there was a fuse missing in the fusebox for the reverse circuit, which prevented the blue wire from getting its 12v when in reverse. Now that I remember, when I added a 7pin to my truck, I had to get relay for the aux 12v line, and a 20 amp fuse for the reverse circuit. Take out your manual and you'll probably see you're missing a fuse (i believe it's 103 or something like that), and it will be the trailer reverse circuit, and it requires 20 amps, that's what you need I think.
http://boards.trailerboats.com/cgi-b...c;f=7;t=001666
http://boards.trailerboats.com/cgi-b...c;f=7;t=001666
Thread Starter
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Junior User
Joined: Sep 2007
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Hm I just read a very good thread on another forum. The person says that there was a fuse missing in the fusebox for the reverse circuit, which prevented the blue wire from getting its 12v when in reverse. Now that I remember, when I added a 7pin to my truck, I had to get relay for the aux 12v line, and a 20 amp fuse for the reverse circuit. Take out your manual and you'll probably see you're missing a fuse (i believe it's 103 or something like that), and it will be the trailer reverse circuit, and it requires 20 amps, that's what you need I think.
http://boards.trailerboats.com/cgi-b...c;f=7;t=001666
http://boards.trailerboats.com/cgi-b...c;f=7;t=001666
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From: Fort Wayne, IN
I wanted to tell you which, but my brother has the truck in Wisconsin for the next month so I can't tell you the fuse number. Just go to the back of your manual and start looking for the trailer reverse circuit, it's somewhere between 100-109 I think. You should have a spare 20amp fuse near the top of the box that Ford puts in there that you can use, that's what I did.
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From: Fort Wayne, IN
http://boards.trailerboats.com/cgi-b...c;f=7;t=002173
Go down to the post by Brick and he says the same thing about the fuse.
Wish I could tell you which fuse.
Go down to the post by Brick and he says the same thing about the fuse.
Wish I could tell you which fuse.
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Lol I was doing my online summer classes but my mind kept drifting to this problem. I only came up with a solution cause I was ignoring my responsibilities.
I wanted to tell you which, but my brother has the truck in Wisconsin for the next month so I can't tell you the fuse number. Just go to the back of your manual and start looking for the trailer reverse circuit, it's somewhere between 100-109 I think. You should have a spare 20amp fuse near the top of the box that Ford puts in there that you can use, that's what I did.
I wanted to tell you which, but my brother has the truck in Wisconsin for the next month so I can't tell you the fuse number. Just go to the back of your manual and start looking for the trailer reverse circuit, it's somewhere between 100-109 I think. You should have a spare 20amp fuse near the top of the box that Ford puts in there that you can use, that's what I did.
Orginally I was thinking the fuse for the reverse light.
Now I follow.
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O.K. Below is what I found in my fuse block that references anything to do with towing. The only one not installed is the relay for towing battery charging. None of them are blown either. I can't seem to get any voltage reading directly from the blue wire either.
fuse # AMP Description
10 20 Trailer tow backup lamp relay, trailer tow 7 wire connector (backup lamp), trailer tow parkamp relay, trailer tow 7 and 4 pin parkamp relay
14 10 trailer tow backup lamps relay coil
29 30 trailer tow electric brake controller, electric brake controller 7-pin
36 10 trailer tow right turn/stop
42 10 trailer tow left turn/stop
106 30 trailer tow battery charge relay (not installed)
R05 trailer tow batter charge relay (not installed)
R201 trailer tow parking lamps relay 7 and 4 pin
R301 trailer tow backup lamp relay
* Relays R301-R305 are not serviceable components, see your dealer for service
fuse # AMP Description
10 20 Trailer tow backup lamp relay, trailer tow 7 wire connector (backup lamp), trailer tow parkamp relay, trailer tow 7 and 4 pin parkamp relay
14 10 trailer tow backup lamps relay coil
29 30 trailer tow electric brake controller, electric brake controller 7-pin
36 10 trailer tow right turn/stop
42 10 trailer tow left turn/stop
106 30 trailer tow battery charge relay (not installed)
R05 trailer tow batter charge relay (not installed)
R201 trailer tow parking lamps relay 7 and 4 pin
R301 trailer tow backup lamp relay
* Relays R301-R305 are not serviceable components, see your dealer for service
