mfoster711
College Station Tx
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There is a 30 amp fuse inline on my battery and the fuse keeps blowing. I am trying to figure out why. I bought this camper new a little over 2 years ago. This fuse has blown numerous times but usually I replace it and then it is fine for awhile. I am guessing that it has blown 8 times in 2 years.
Well, just recently I pulled my two batteries out and filled them with water. I am fairly confident that I put the two batteries back in properly but not 100% sure. I am now having a problem where the fuse blows immediately once I try replacing it which obviously makes me think I didn't connect the batteries back properly. Went through 3 fuses and quit trying.
Here is an image of my batteries hooked up. Does this look right? Dual batteries are not my specialty so I was hoping somebody could verify the hookup.
If they are hooked up correct, then why would my fuse keep blowing?
* This post was
edited 03/15/11 11:11pm by an administrator/moderator *
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TURK2500
SE Michigan
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Something doesn't look right, check the diagrams here (mid-page): link
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BFL13
Victoria, BC
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You suspect correctly. Your 12v batteries should be wired plus to plus and neg to neg. The white wire should go neg to neg and the black plus to plus in your case.
Your past 30 amp fuse blowing is a different event. If the converter can do 55amps and actually can get more than 30 amps of charging to the batteries through the existing wiring, then 30amp fuse is too small.
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PenMan
New Mexico
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You have the batteries hooked up wrong. You should connect the positive on one battery to the positive on the second battery. Then connect the negative on one battery to the negative on the second battery. Then you connect the positive lead from your trailer to the positive terminal of one of the batteries. Connect your negative lead from your trailer to the negative terminal on the second battery. This puts your batteries in parallel since they are 12 volt batteries. You can easily identify the negative lead from the trailer as it will probably be connected to the trailer frame very close to the batteries. Hope this helps.
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Ranger Smith
Wherever the rig is parked
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THOSE ARE WRONG YOU HAVE A + to a - AND a + to a -
Needs to be + to + and - to - on the jumpers then the white goes to -
black goes to +
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barbjohn
Newburgh, NY, USA
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As per the picture, each battery has 6 cells (12V ea) indicating that this set-up will have a 24V output. You stand to blow more than a fuse.
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mexbungalows
las peñas, michoacan, mexico
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Congratulations on your twenty four volt reconnect. Time to drop to your knees and pray, do a like polarity reconnect with all your fingers and toes crossed.
I have seen worse, like the fellow who connected all four batteries in series. Took a while to put out the fire...
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mfoster711
College Station Tx
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Thanks for all the replies. One more question, how do I determine which wire is positive and negative. Is it safe to assume the black wire is positive since it has the fuse inline? I didn't think you would normally put a fuse on a negative wire? And, if I get it backwards, what might happen?
Edit: Per one reply I tried to see where the wires went to see if I could determine which is connected to the frame but I can't see the end of the wires.
Edit2: Never mind, I read your replies better and realized two of you told me the correct wire. Thanks,
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skipnchar
Topeka or somewhere else
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24 volts through a 12 volt system will tend to do that 
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Hiking Hunter
Warrior, Alabama, usually
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You may have done inadvertently yourself a favor, depending on the sequence you connected your wires. The way you have the batteries connected will not produce 24 volts, it will produce 0 volts. The batteries are connected in parallel, but they are "bucking" each other. The batteries are probably toast, but that may have saved your camper electronics.
Follow the diagram TURK2500 provided a link for when you connect your new batteries.
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