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Old 07-10-2013, 12:33 AM   #1
Join Date: Jul 2013
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Fuse on battery?

our new jayco has a 30 amp fuse off the battery. we were told to pull this in storage to prevent battery drain. however, with the fuse pulled and tv disconnected, all the 12v stuff still runs?

what gives?

is something wired incorrectly? or am i missung something?

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Old 07-10-2013, 02:53 AM   #2
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If your Travel Trailer (TT) is still plugged into the Travel Vehicle (via trailer connection) - or plugged into a 120V power....the 12V system will still function without a battery connected.

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Old 07-10-2013, 04:25 AM   #3
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This is simplified block diagram of your trailer 30AMP power system. As you can see both the Trailer Converter/Charger unit and the Battery feed the Power Distribution Panel which is the heart of your trailer power distribution. This panel allows your trailer's most critical components/appliances to be powered up by 120VAC shore Power or directly from the Battery when camping off the power grid.

If you have pulled the Battery cable protection fuse that is located next to the battery while the trailer is still connected to shore power 120VAC then the 12VDC items will still be powered up by the trailer on-board converter/charger unit...

Don't misplace this fuse as when you are connected to shore power the on-board converter/charger will not be able to keep your battery charged up with this fuse removed.

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Old 07-10-2013, 08:44 AM   #4
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Fuse on battery?

The trailer was not connected to shore power or the tv. With the fuse pulled I still had power from the battery

I do not have a elec tongue jack so its not for something else.

What is this fuse supposed to protect? Should it be on the pos or neg?
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Old 07-10-2013, 09:01 AM   #5
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How many wires connected to the + side of the battery? The fuse should be on the + side and there should only be one wire unless there is a direct + line to the break-away switch.
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Old 07-10-2013, 09:21 AM   #6
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I have 3 wires to the + side. Breakaway switch (which by-passes the fuse), tongue jack and main power to the 12v distribution box (last 2 are in-line with the 30A fuse). Pulling my 30A fuse shuts down the trailer 100% except for the breakaway. It sounds like your 30A fuse is bypassed (which I'd say defeats the point of the fuse) or the fuse holder is defective (shorted). You can verify the latter by disconnecting the battery and pulling the fuse then use a VOM to check for continuity from the + side of the fuse to the ground wire (or trailer frame). Should be an open circuit. Which TT and year do you own? Let the group know what you find.

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Old 07-10-2013, 09:26 AM   #7
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Take it to the dealer and have them resolve the problem which is likely to be some kind of a wiring issue. Otherwise you have just discovered a magical way to create power. TT's don't run on their own. To prove my point, get a wrench and disconnect the [+] battery cable from the terminal. This will disconnect your battery from the TT power grid. Confirm that the shore power cord is not connected and that the TV is not connected. If you still have 12v then there is another battery somewhere which would have to be a previous owners modification.
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Old 07-10-2013, 02:11 PM   #8
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Not sure what OP has, but I have 2012 267BHS with same issue. Pulling fuse has no effect on power to trailer and I am not connected to shore power. I will check for defective fuse holder. Thanks.
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Old 07-10-2013, 02:52 PM   #9
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If you have 12V power after pulling the what you believe to be the battery fuse and you are not connected to shore power or your TV there are only two possibilities: 1) You are not pulling the right fuse OR 2) There is another battery in play.
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Old 07-10-2013, 03:28 PM   #10
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On my 2014 there are 3 wires coming from the battery. One is a thin orange wire that goes directly to the breakaway switch. One is a thin green wire with a fuse in line - that connects to two thin black wires; one for the tongue jack and the other goes to a black electrical box on the front of the frame. The 3rd wire is a thick white wire that also goes to that same electrical box.

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