Fuse Confusion
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Laughing Gas
Joined: Aug 2017
Posts: 996
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From: Oklahoma
Fuse Confusion
I'm converting our fifth wheel to a lithium battery. I want to disable the truck's charge line until I decide if want to add a dc to dc charger. In the manual it shows fuse numbers 7 and 26 as trailer tow battery charge. Does anyone know why there would be 2 fuses for the same thing? By chance anyone know if I pull one or both?
Tuned
Joined: Jan 2023
Posts: 304
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I'm converting our fifth wheel to a lithium battery. I want to disable the truck's charge line until I decide if want to add a dc to dc charger. In the manual it shows fuse numbers 7 and 26 as trailer tow battery charge. Does anyone know why there would be 2 fuses for the same thing? By chance anyone know if I pull one or both?
Fleet Mechanic
Joined: Feb 2021
Posts: 1,405
Likes: 1,171
From: East TN
Looking at the wiring manual for my 2019, it looks like there are two fuses because Ford used the same harness for trucks with and without the trailer tow module. You pull one fuse if you have a TTM, the other if you don't. That should be really easy to test on yours, minus the whole scenario of having to start the truck, put it in gear, etc. to get the charge power to start anyway.
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Laughing Gas
Joined: Aug 2017
Posts: 996
Likes: 132
From: Oklahoma
It sounds like a dc to dc charger might be easier if I can find enough videos showing how to get it connected properly. There is no junction box on my fifth wheel that I have found. The 7 pin cord just disappears under the fiberglass. There's a wad of wires coming out in the front storage/battery box. I'm sure one of them is probably the one I need so will do some exploring. I do have a dc to dc charger in my cart on Amazon. All I have to do is push the buy now button which might be easier.
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