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Old 11-27-2023, 09:31 PM   #1
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Can you identify this?

I'm new to my 2017 jayco 195rb with solar, this box and fuse are located near the tongue. I pulled the 15 amps fuse and noted it was blown (haven't replaced yet) I have not located anything not working. Does anyone know what this fuse is for?
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Old 11-28-2023, 05:11 AM   #2
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From many stories of new to their owner units, don't assume a 15 amp belongs there.

Usually it is between the battery and converter and will basically shut everything down. I would check the specs, it may actually be a 30 that is required.
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Old 11-28-2023, 07:55 AM   #3
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It looks like the battery charging fuse harness. Batteries are capable for many amps that can destroy 12 volt systems. The charging fuse on my Jayco had green wires to it and was a 30 amp fuse. Higher amp devices are protected with resetting automatic breakers.
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Old 11-28-2023, 09:13 AM   #4
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I agree it should have a 30 amp fuse in it. I believe that's in the circuit from the 12 volt connection from the truck to the battery. You can test the fuse holder terminals with a test light or VOM to see if it's dead with the 7 pin unplugged, and then has one hot terminal when you plug it back into the truck.
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Old 11-28-2023, 10:45 AM   #5
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Disconnected from Shore Power, if that fuse is blown or missing you should have no 12V power. On our TT, it is a 30 amp fuse. Carry a few spares.
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Old 11-28-2023, 10:34 PM   #6
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Finally traced the fuse

The fuse was traced to the 7 pin connector that goes to the truck 12v accessory.
Any idea what size the fuse should be? Is this used to charge the TT while traveling?
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Old 11-29-2023, 05:42 AM   #7
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Quote:
Originally Posted by jsaylor View Post
The fuse was traced to the 7 pin connector that goes to the truck 12v accessory.
Any idea what size the fuse should be? Is this used to charge the TT while traveling?

If it is the accessory power from TV, I'd replace with the same 15A. As far as I know most tow vehicles only supply around 8A max. If it keeps blowing, check for shorted wiring.
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Old 11-29-2023, 08:44 AM   #8
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If it is the accessory power from TV, I'd replace with the same 15A. As far as I know most tow vehicles only supply around 8A max. If it keeps blowing, check for shorted wiring.
This.

The TV is only putting about enough for a trickle charge on the battery through the 7-pin.

I remember having to replace or re-work that connection up front, but can't remember the circumstances.

I can't remember if ours went into the J-box up front, but I do remember opening that up and just shaking my head. I had corroded connections galore in there. Easy fix, but sloppy OEM wiring work.
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Old 12-02-2023, 01:49 PM   #9
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30 amp fuse
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Old 12-02-2023, 06:52 PM   #10
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Quote:
Originally Posted by jsaylor View Post
The fuse was traced to the 7 pin connector that goes to the truck 12v accessory.
Any idea what size the fuse should be? Is this used to charge the TT while traveling?
I betcha that if you replace it with a 15 or the same size fuse that comes from your tow vehicle it will be fine.

I'd rather blow the trailer fuse than the TV fuse, but that's just me...
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