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Old 11-15-2018, 09:39 AM   #1
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Fuse? for 12V on 7 pin trailer connector

I have a Jayco 2015 Precept 31UL, Ford F series Super Duty chassis, Triton V10. I used the 12v from the 7 pin trailer/towed car connector on back of Rv to keep Car battery changed. Worked good, than lost the 12 v power at connector. Other lits still work.
Talked to Jayco factory, checked fuses in panel under hood, all ok. Must be another fuse, I have look in Ford manual, can not find it.
Any ideas where it is?
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Old 11-15-2018, 10:04 AM   #2
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I may be wrong, but I think it's a relay, not a fuse. See if you can find a diagram online.
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Old 11-15-2018, 11:29 AM   #3
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On my FORD F150 series it is the fuse panel over the top of the radiator. Has a fuse and a RELAY. The FUSE and RELAY was in my glove box which was unmarked on what it was for... My ignition has to be 'ON' to provide 12VDC back to my POPUP trailer. In the owners manual it is all called 'trailer tow' I think...

Don't know if all of that is different for the larger trucks or not...

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Old 11-15-2018, 02:29 PM   #4
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Ray, the OP has a Ford F-53 motorhome chassis so nothing like the F-150.


Davedave, check your Ford manual as I would think there is a fuse in a chassis fuse box for the 12v charge line going to the 7 pin since that line is on the load side of the alternator. There are also a few supplemental fuses near the battery and Jayco may have source the charge line there.
Also, there is a Facebook Precept and Alante page that now has 350 followers and you may get a more accurate response there.
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Old 11-15-2018, 09:27 PM   #5
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Subscribing in hopes of a valid answer

I thought I had lost my 12V line back in the summer and searched high and low for a fuse but never located one. Had a lot of people point me in several directions but they all proved fruitless.

Ford says it is up to the body installer to add the 7 pin circuits. Jayco says it comes that way from Ford.

I tend to believe Ford just because the chassis arrive at Jayco and have that lonnnnnngg extension added behind the rear axle at a local shop. I have seen both the stock chassis and altered chassis when I took the factory motorized tour last year. Wish then I had know to ask that question.

I'm using that 12V line to charge my CR-V battery so it would be nice to know where it originates and how it is protected.
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Old 11-16-2018, 07:39 AM   #6
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Quote:
Originally Posted by davedave View Post
I have a Jayco 2015 Precept 31UL, Ford F series Super Duty chassis, Triton V10. I used the 12v from the 7 pin trailer/towed car connector on back of Rv to keep Car battery changed. Worked good, than lost the 12 v power at connector. Other lits still work.
Talked to Jayco factory, checked fuses in panel under hood, all ok. Must be another fuse, I have look in Ford manual, can not find it.
Any ideas where it is?
On the F350 SuperDuty it is under the hood against the firewall and a real PITA to get to.
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Old 11-16-2018, 07:56 AM   #7
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Guys,

Just like Vicr posted above, F series pickup trucks have no relevance to the OP's question. Please try to stay on topic.
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Old 11-16-2018, 11:17 AM   #8
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Quote:
Originally Posted by jasum View Post
On the F350 SuperDuty it is under the hood against the firewall and a real PITA to get to.

This is a motorhome forum not an F series truck forum. Please be relevant.
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Old 11-16-2018, 02:35 PM   #9
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this is a motorhome forum not an f series truck forum. Please be relevant.

really??
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Old 11-16-2018, 03:32 PM   #10
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Yes, really.

If you spend enough time here you see people replying with non relevant comments on travel trailers and fifth wheels.

Class A owners come here to seek help with issues, me among them and non-relevant comments just tend to clutter the forum.

There is a lot of combined experience within the Jayco forums which can make life easier for those seeking help and advice.
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