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Old 12-27-2013, 09:11 AM   #11
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Check the fuse layout info in your manual and ID the location for the 12V aux fuse/relay. When I picked up our first TT, the dealer installed the WDH and I remembered him getting under the hood and popping open the fuse box. Didn't understand exactly what he was doing, but when we headed home, we were good to go and the TT battery charge when we were on the road. A couple years later we purchased a new Chevy Silverado with the tow package. Didn't notice anything wrong on our first short tows for weekend outings, but noticed a low TT battery on a multi day road trip after 100's of miles of towing. My thinking was taken back to that original dealer install on the 150 and that diddling he did under the hood. Sure enough, a quick read in the manual when we got home, I quickly found the empty position in the box. The fuse/relay is one of the large speciality type so is a bit pricey, but found what I needed at a local auto parts store and the problem was solved. Its easy to trouble shoot and just as easy to fix if its a problem with a missing or blown fuse.

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Old 12-27-2013, 11:26 AM   #12
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Thanks for all the feedback. I will check my owners manual to verify the positions. Still don't understand why the ford service department does not have a clue about this and why does ford not just do this at the factory

2017 F-250 Lariat
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Old 05-13-2015, 10:54 AM   #13
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I have a 2008 Ford Expedition with the HD tow package. I've towed a boat with it for years. About a year ago, I started towing a pup. Noticed the battery was not charging when connected to tow vehicle, but always suspected the wiring in either the expedition, or the camper.

Towed the camper with a friend's truck last weekend, and realized that vehicle DID charge the battery when connected. Thanks to this thread, I discovered I too was missing the relay and fuse. Luckily, both were in a bag with a wiring diagram in my glove box for the past 7 years!!! Installed and everything works as expected now!
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Old 05-13-2015, 06:22 PM   #14
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[QUOTE=mcfarmall;164941]You should have a baggie in the glove box with a fuse and a relay in it. They go in positions 9 and 21 on the power distribution box that sits above the radiator when the hood is open. You must install them before towing if you want 12v at the 7-pin connector. I install mine in May and remove them in November as I learned on the F150forum.com that having voltage on the pin(s) will increase the likelihood of galvanic corrosion on them over time

+1 if you google it there is a forum thread where a guy even post pics pointing to where the fuse and relay go in the electrical box. If you did throw away it shouldn't be an expensive replacement
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Old 05-17-2015, 12:01 AM   #15
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Hmm. Interesting! We have a 2013 F150 with a built in brake controller. I did notice that there is no juice coming back when the truck is shut off, and just thought that is the nature of the beast. My old 97 Sub gasser has two batteries, one with a cut-off switch, so it will start if you use the switch, even if all the other batteries are dead. It had juice coming back running or not. I shall have to look into this. The Ford has only one battery, so I am not sure how badly I want to have its battery online when the engine isn't running. Decisions, decisions!
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Old 05-17-2015, 06:46 AM   #16
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Guys please remember that small a wire over that long a run makes it only a battery maintainer.. not really a charger..
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Old 05-17-2015, 07:38 AM   #17
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Interesting information about the galvanic corrosion, maybe that is why Ford doesn't install the relay and fuse during assembly.
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Old 05-31-2015, 07:34 AM   #18
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I found this out on my 2015 Lariat with max tow. My TT battery was too low to raise the jack. I figured I would plug it into the truck connector to let it charge a minute.

When I plugged in the trailer I noticed that the dash display gave me a notice that the battery was not charging. Sure enough, the jack didn't perform any differently when I tried it while engine was idling.

I then thought maybe if I increased the rpms it would make a difference. I sat running at about 1500 rpms for a few minutes and tried the jack again. The battery for sure got charged by doing this as the jack functioned close to normal. I speculate that the 2015 turns off power at idle or when engine is not running and kicks it in when at a driving rpm. I can't find anything to confirm this in the manual, but this was my experience.

My battery power indicator in my trailer also shows full after I drive it a while. When I picked it up from the dealer it was reading 3/4 fully charged. By the time I got home it was fully charged.

It would make sense that Ford added this to the new 150 with all the other changes and improvements. That would also explain why the new truck does not come with the extra fuse to plug in to make the 12v connector hot.

Again, I'm just sharing my own experience.
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Old 05-31-2015, 09:22 AM   #19
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My complaint was the fuse and relay was in an unmarked small clear plastic zip lock bag. Had no idea what it was for... Then when I hooked up the trailer and found out I didn't have 12VDC there I looked it all up in the manual and noticed right away I was missing the plug in fuse and black relay. Light in head then comes "ON" what the two units in the bag was for.

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Old 05-31-2015, 11:28 AM   #20
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Though I replied to all so sorry. I did find the baggies in installed them. I guess everything is working. I am seeing corrosion (I think) because some of the pins on the trailer plug and on the truck are green. Anyone know how to prevent that

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