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Old 04-05-2015, 08:53 PM   #1
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What size of inline Fuse at Battery?

I just bought a previously owned Jayco JayFlight 32 BHDS. In troubleshooting why I wasn't getting power from battery; I discovered that there is an in-line fuse at the battery. Can someone tell me what size of fuse should go in here?

I asked a sales guy at local RV dealership but didn't get a confident feeling in his answer.

Bill
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Old 04-05-2015, 09:31 PM   #2
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30 amp on mine...unsure if its the same but most likely is.
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Old 04-05-2015, 09:43 PM   #3
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If your TT has 30 Amp service (plug) then I'd expect a 30 A fuse.
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Old 04-05-2015, 09:51 PM   #4
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Thanks.
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Old 04-08-2015, 05:26 PM   #5
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Originally Posted by RedHorse1 View Post
If your TT has 30 Amp service (plug) then I'd expect a 30 A fuse.
With all due respect, the 30 amp service plug (AC) has nothing to do with the inline fuse at the battery, which is there to protect overload and protect the wire as well. These wire are rated for a certain DC capacity before they start heating up. I would expect the fuse to be proportional to the wire used between your converter and the battery. You can tell based on the AWG # printed on the wire itself. I would expect it to be a 8 AWG, which can go up to 30 amps at 15 feet (which is probably the length you have between the battery and the converter.)

So yes, 30 Amps sounds about right, but in doubt, always go with lesser fuse size. Changing a blown fuse is much cheaper than the hazard of having an overloaded wire catch fire.

Take a look at:

Amps and Wire Gauge - 12V Circuit
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Old 04-08-2015, 05:52 PM   #6
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On our previous TT, I had a problem with the fuse "holder" getting hot, to the point that it was distorting. The wire that came with the fuse holder was only at best 12 ga., and it was spliced into a #8. I ended up going to an auto parts store and getting a 30 amp "Maxi-fuse" holder, which had #10 wire on it. Same protection, just a bigger fuse physically so it had more contact area. I put it in with crimp style butt splices and heat shrink tubing. That solved the heating problem. Some of the things they do at the factory really makes you wonder.
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Old 04-08-2015, 06:15 PM   #7
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Thanks Jfguay2. I will head out to camper this weekend to try and determine the wiring size. In meantime, can you (or anyone) tell me how to identify where the converter is so that I may measure the distance between it and the battery.

Thanks
Bill
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Old 04-08-2015, 07:28 PM   #8
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Originally Posted by wbarnes View Post
Thanks Jfguay2. I will head out to camper this weekend to try and determine the wiring size. In meantime, can you (or anyone) tell me how to identify where the converter is so that I may measure the distance between it and the battery.

Thanks
Bill
I tried to look it up online but could not find it. You should have no problem locating it though, as it is together with the breaker panel where AC comes in on one side, and there are DC fuses on the other, along with the converter and so on. The converter is basically converting 120v into 12v when plugged into shore power at the same time as it charges up the battery. I would be surprised if any converter Jayco puts in currently outputs more than 30 amps when charging the battery, but with the 30A fuse, that would be the limit anyhow.

I have just taken a look at mine, and mine is also a 30A with an #8 AWG wire. Would not be surprised that is standard on many Jayco's. Mine's a 2011 X213.

Good luck!
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Old 06-06-2016, 07:58 PM   #9
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Hi, I'm having almost the same issue with my trailer. I have a red 10awg wire (coming about 14 feet from the converter to the battery box at the front) tying into a yellow 12 awg wire at the end (about 4-6" long) with fuse holder. I was on another forum and some said it should use a 20amp fuse and others said its ok to go with a 30amp fuse. What is your opinion on this? I have a photo but don't see how to attach it here.

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Robyn
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Old 06-06-2016, 09:03 PM   #10
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Welcome to the forum.

If you post info on the year and model of your trailer, maybe someone with the same trailer would be able to help.
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