12 volt power with trailer connected
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Freshman User
Joined: Aug 2018
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12 volt power with trailer connected
So I know there are numerous other threads on this but I’m curious if others are having the same issue still as myself. I have tried many combinations with no avail and I don’t want the dealer to hack something up to make it work.
I plug my trailer into my truck which is a 2019 CCSB Lariat Diesel. The truck recognizes that a trailer is plugged in but no matter what I do it will not liven up the 12 volt power so I can run my jack unless I put the truck in gear. So far the only way I have been able to get it to work is to put the truck in neutral and set the parking brake so the truck doesn’t move. This is completely dumb and dangerous. I’ve tried the adapters that are supposed to work and still nothing. Is there something I’m missing here? The dealer has been no help in answering my questions and they want to schedule an appointment but they are booked for almost 2 weeks. This is ridiculous! Brand new truck and this should not be a problem. Can anyone give me some guidance? I don’t want the dealer just tapping into something to liven it up. Are others finding this same problem? Thank you for your help.
edit... The truck recognizes that a trailer is hooked up everytime I plug it in. Thank you.
I plug my trailer into my truck which is a 2019 CCSB Lariat Diesel. The truck recognizes that a trailer is plugged in but no matter what I do it will not liven up the 12 volt power so I can run my jack unless I put the truck in gear. So far the only way I have been able to get it to work is to put the truck in neutral and set the parking brake so the truck doesn’t move. This is completely dumb and dangerous. I’ve tried the adapters that are supposed to work and still nothing. Is there something I’m missing here? The dealer has been no help in answering my questions and they want to schedule an appointment but they are booked for almost 2 weeks. This is ridiculous! Brand new truck and this should not be a problem. Can anyone give me some guidance? I don’t want the dealer just tapping into something to liven it up. Are others finding this same problem? Thank you for your help.
edit... The truck recognizes that a trailer is hooked up everytime I plug it in. Thank you.
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
Connect the trailer, set the trailer correctly, put in drive with foot oil brake, then back to park. It will set the 12 volt power, shortly after, it’s going to take a few seconds to recognize the voltage draw to push power. It is a sensing voltage circuit. You also have to leave the vehicle running in park with the e brake set. It’s to control the draw on the truck batteries.
Junior User
Joined: Sep 2018
Posts: 83
Likes: 5
From: Dallas
Man i thought i was going crazy. My bull dog jack worked on fine on the rental F250s i've been using but not on the one i just bought. Tried all sorts of the stuff and was about to buy a new jack. Never thought the truck might not be sending power. I'm going to go and test this sometime soon.
Thanks
Thanks
Thread Starter
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Freshman User
Joined: Aug 2018
Posts: 26
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Connect the trailer, set the trailer correctly, put in drive with foot oil brake, then back to park. It will set the 12 volt power, shortly after, it’s going to take a few seconds to recognize the voltage draw to push power. It is a sensing voltage circuit. You also have to leave the vehicle running in park with the e brake set. It’s to control the draw on the truck batteries.
Laughing Gas
Joined: May 2006
Posts: 1,211
Likes: 69
From: land of 10,000 lakes
I have 2019 cclb diesel.
I get 12v to trailer with truck running and in park but drivers door must be shut.
I spend 45 mins the other day scratching my head checking fuses on the truck with only 250 miles on it and fuses on the trailer. Whole time drivers door was open, I was about to take a break and I shut the door and my 12volt pump kicked on, opened the door again and pump shut off.
I get 12v to trailer with truck running and in park but drivers door must be shut.
I spend 45 mins the other day scratching my head checking fuses on the truck with only 250 miles on it and fuses on the trailer. Whole time drivers door was open, I was about to take a break and I shut the door and my 12volt pump kicked on, opened the door again and pump shut off.
Junior User
Joined: Jan 2006
Posts: 60
Likes: 0
From: Gilbert, AZ
I am in the same boat, my trailer jack needs to run off of the truck plug to even get the trailer on the hitch.
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Logistics Pro
Joined: Dec 2004
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From: Weatherford Texas.
I am starting to wonder if the difference is that some trailers don't have a battery on them, so maybe the truck isn't detecting the charge current and shutting off the power.
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Prolocutor
Joined: Jan 2009
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From: Western MA
I have the same issue but on only one of my trailers. On my RV and my Bri-Mar dump, once the brake pedal is pressed, the charge circuit stays on until the truck is shut down. However, when my enclosed aluminum trailer is connected, I have the issue the OP has. Put the truck in gear and the charge circuit goes hot. Put it back in park and the charge circuit goes dead. No idea what the difference is. All three trailers have LED lights. All three have their own battery. All three have brakes. Makes no sense.
Logistics Pro
Joined: Dec 2004
Posts: 3,541
Likes: 5
From: Weatherford Texas.
I have the same issue but on only one of my trailers. On my RV and my Bri-Mar dump, once the brake pedal is pressed, the charge circuit stays on until the truck is shut down. However, when my enclosed aluminum trailer is connected, I have the issue the OP has. Put the truck in gear and the charge circuit goes hot. Put it back in park and the charge circuit goes dead. No idea what the difference is. All three trailers have LED lights. All three have their own battery. All three have brakes. Makes no sense.
Prolocutor
Joined: Jan 2009
Posts: 13,618
Likes: 1,245
From: Western MA
It's not an issue for me either except on my enclosed trailer. The interior and exterior flood lights run on the charge circuit which would be useless only powered when the truck is in drive. So, I had to change them to the parking light circuit to make sure they work when needed. Having everything controlled by the BCM is a bit overly modern... ie:complicated. Just keep it simple. Have the charge circuit work when the truck is running and off when it's not.
Thread Starter
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Freshman User
Joined: Aug 2018
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So I haven’t tried any other trailers but the one I am having problems with is an aluminum enclosed trailer also. I guess maybe I should check if it works if I have the door shut but I really don’t understand why that would make a difference? I also don’t understand why it just doesn’t go hot not matter what if the truck is running. And the thing that really bothers me the most is that this seems to have been a problem for awhile now. Wake up Ford! Me having to put my truck in neutral to get my power jack to work sure seems like a major liability on your part! There’s no reason why they haven’t remedied this issue. Very frustrating on a $75,000 truck.
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
Sorry has to be shut. Just put in drive, then back to neutral and park. When you put in gear you have to press the brake, this is what set the power. Leave running, in park, e brake on, and close the door, it will work. Doesn’t the trailer have a. Battery for the emergency brakes? Has to have a battery to detect for the power circuit. That is why you have issues. Either that or you have a trailer not wired correctly....
Prolocutor
Joined: Jan 2009
Posts: 13,618
Likes: 1,245
From: Western MA
No, that doesn't work on one of my 3 trailers and no, that trailer isn't wired incorrectly. There has to be some parameter that that the truck is looking for that certain trailers aren't reaching. Interesting that both trailers in this thread that have the issue are aluminum. I'm not sure how that could play into it. Perhaps a grounding issue? IDK. Not a big deal for me as the only thing on my charge line is the breakaway battery for the brakes and that gets charged while driving. I can see where guys with electric jacks would find this very frustrating. The whole system is overdone. On my wife's SUV, the charge line is always hot. Some folks have rewired their trucks in this fashion or wired them off a relay to keep them hot whenever the truck is running. This would be a good, cheap solution for the OP.