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Old 04-27-2015, 11:53 AM   #1
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Angry Connecting the battery and....

Every time I have connected my battery I get a spark and I blow fuses. I have tried positive last, negative last, main breaker off (didn't think it would work), main fuse pulled (just blows when I reinstall the fuse). I will install a battery disconnect switch which might solve the problem but my other camper never had a problem when I connected it. Should this be an issue?
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Old 04-27-2015, 11:58 AM   #2
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Originally Posted by Bianchina3 View Post
Every time I have connected my battery I get a spark and I blow fuses. I have tried positive last, negative last, main breaker off (didn't think it would work), main fuse pulled (just blows when I reinstall the fuse). I will install a battery disconnect switch which might solve the problem but my other camper never had a problem when I connected it. Should this be an issue?
While sparking is bad (you should add a shutoff switch), it should not be blowing a fuse. You most likely have a short somewhere.
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Old 04-27-2015, 12:10 PM   #3
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have you changed out any lights ?? I had same thing happen to me when I was rebuilding my old tt got a white wire mixed up and had had 110v hooked up as a ground wire on a clearance light. just a thought.
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Old 04-27-2015, 12:48 PM   #4
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Make sure negative cable is the one that is connected to the frame of the trailer otherwise you will blow the converter reversing fuses (usually 40 amps)
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Old 04-27-2015, 02:26 PM   #5
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Thanks for the input. I didn't describe the issue enough I think. The fuses do blow but as long as the battery isn't connected (i.e. shore power) everything works fine. I don't think the issue is a short. It happened when not connected to shore power and, not surprisingly, when connected as well. It has blown both the charging fuse and the reversing fuse. Hmmmm.....
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Old 04-27-2015, 03:40 PM   #6
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It happened when not connected to shore power and, not surprisingly, when connected as well. It has blown both the charging fuse and the reversing fuse. Hmmmm.....
The battery is backwards. You have the positive on the negative terminals.
You are shorting out to the converter.
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Old 04-27-2015, 03:45 PM   #7
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The battery is backwards. You have the positive on the negative terminals.
You are shorting out to the converter.
X2. Your cables are backwards, or your battery was completely depleted at one time and stuck on a charger in reverse polarity so you battery itself is now reverse charged.

Stick a multimeter on the posts when disconnected. If the battery was reverse charged you'll be needing a new one.
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Old 04-27-2015, 03:51 PM   #8
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I was not aware that you were shorting out the converter when the battery is connected backward. I just put my fully charged battery back in the Jammer,as a test I operated the jacks, and found that the polarity was reversed. Pushing the up button was down, so I reconnected it and they work like they are supposed to. I need to mark my cables. hope I have not caused damage. Everything seem to work ok, except my radio.
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Old 04-27-2015, 04:41 PM   #9
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I accidently crossed my battery wires once, blew the reverse polarity fuses and the little 5 amp fuse on the back of the radio.
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Old 04-27-2015, 09:39 PM   #10
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I feel like a complete idiot. It was hooked up backwards! DUH!
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