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Old 10-11-2017, 01:38 AM   #1
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2017 F350 Trailer Tow Fuse

Question Here....I am trying to get 12V to the onboard batteries to keep them charged while on the road. Problem Here....The relay slot on the truck has no spades to make contact, and the fuse slot seems to have only 1-spade (2 needed to complete the circuit) Anyone had a similar issue??? Got me baffled and the Ford dealer just sent an inquire to Ford to see what they have to say about it. Thanks for any response!
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Old 10-12-2017, 07:27 PM   #2
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Sorry...I don't understand. Your trailer plug should be providing 12V to the RW.
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Old 10-12-2017, 08:15 PM   #3
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It's possible your truck is not equipped with a tow package? As Tom said, if it is you should have a 4 pin trailer connector (flat) and a 7 pin connector (round). The 7 pin has a pin for house battery charging. If you don't have the tow package on your truck, maybe the fuse box is not equipped with a trailer charge line.
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Old 10-12-2017, 10:57 PM   #4
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Some vehicles actually just come with a pigtail that terminates near the fuse box and you need to connect it to get power to the trailer plug I am not sure why the manufactures do that but I can think of several vehicles that are in that category .
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Old 10-13-2017, 04:29 PM   #5
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Quote:
Originally Posted by xtasee View Post
Some vehicles actually just come with a pigtail that terminates near the fuse box and you need to connect it to get power to the trailer plug I am not sure why the manufactures do that but I can think of several vehicles that are in that category .
I've seen that for aux. switches but never for the trailer plug.

And to J&Ms point, if that kind of truck was sold without a trailer package, and the customer didn't know it, the salesperson should be drawn and quartered.
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Old 10-13-2017, 10:06 PM   #6
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The fuse box has spots for what ford calls “Trailer tow battery charge” which is exactly what I need. The Ford response to my dealer is that there is no fuse for that spot and none intended!! The dealer says every Super Duty truck which is what mine is should be equipped with them. They are wanting me to bring the truck and trailer both to the dealership and they say they will have to do diagnostics to change stuff on the truck computer system to get it to do that....Very strange! I’m NOT going to do that. I am thinking, the truck has an onboard inverter that makes 110 power and if I could just figure how to run a power cord to the truck I could just get a battery charger to put on the batteries? What do you guys think?
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Old 10-13-2017, 11:25 PM   #7
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If it were me being a new truck I would take it to the dealer and tell them to fix it
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Old 10-14-2017, 12:06 AM   #8
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I agree Shane-returning the truck to the dealer to have a properly installed tow package would be best. Vehicle insurance companies also like that in case of an accident or fire.
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Old 10-14-2017, 12:07 AM   #9
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So...you're wanting to use 120v from the truck's inverter to charge the house batteries in your RW?
The plot thickens.
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Old 10-14-2017, 01:29 AM   #10
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Well my on board inverter plugs on my 2015 F350 say 150 W, which translates to about 1.25 A AC, which is not nearly enough to run any 12 VDC battery charger I'm familiar with.
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