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Old 09-12-2010, 06:05 PM   #1
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Fuse For Charging Batteries From Tow Vehicles

I need help to locate where the fuse is on my 5er. I have a 2004 Gulfstream Yellowstone 30 ft. 5th wheel. I can't charge the batteries using my tow vehicle so i wanted to check to see if the 50 amp fuse for the trailer was blown but I can't find it. I did find 2 30 amp fuses on the converter box in the front hatch by the jacks, I even looked in the pin box and found the junction box where the cable ties in to the trailer but I didn't see any fuse, unless it was under all the electrical tape. I can charge the batteries if i plug it into the 110 outlet but not being hooked up to my truck.

If anyone can enlighten me as to where the fuse is i would really appreciate it.

Thanks Larry
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Old 09-12-2010, 06:17 PM   #2
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Welcome Larry to irv2.
You would need power off your truck alternator to charge your trailer battery.
In this diagram you have maybe two extra leads if not used for brake system on trailer.
If they are would have to run new to your battery to keep charged off alternator.
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Old 09-12-2010, 09:03 PM   #3
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Here is a link for the power connectors on a RV:RV Wiring
Pin 4 is 12V from your tow vehicle, check this voltage with the truck running. If you don't have 12V here there is a problem in the truck, maybe you have to install a fuse in your truck. I had to do this on mine. Your tow vehicle will not charge your battery as fast as the converter can.

You did not tell what tow vehicke you are using, this may help if we know.
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