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Old 07-22-2015, 07:03 PM   #1
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hook up the battery wires backward

hello i am new at this just got my self a 1983 j 2150 travel trailer still need to learn how everything work i pick up a new battery and put in and hook up the wires the the wrong way don't know if i blew any fuse i went in to see if the light work did not come on so i was thinking the battery was no good so i took the wires off and left it i will hook up tomorrow the right way to see if they work i also try geting the tail lights and turn singles to work knothing is working put some one said you have to have the ball hook up any info will be nice thanks mike
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Old 07-22-2015, 07:12 PM   #2
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I think hooking a battery up backwards will blow a fuse. It may be one on the backside of the power panel.
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Old 07-22-2015, 07:35 PM   #3
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I think hooking a battery up backwards will blow a fuse. It may be one on the backside of the power panel.
Thank you i have to check it out tomorrow going to take it to a dump site and flush out the tanks
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Old 07-22-2015, 09:54 PM   #4
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Most have an in-line fuse close to the battery and two more fuses on the 12V Power Distribution Panel labeled REVERSE POLARITY.

All three of these fuses will blow if the battery is hooked up backwards.

I always look for the word 'NEG' or the symbol '-' stamped on the battery case. Then I make sure this is the battery cable coming from the frame ground.

The RV's can have either BLACK and WHITE cables where BLACK is positive 12VDC and WHITE is frame ground or they may have RED and BLACK cables where RED is positive 12VDC and black is frame ground.

Just to be safe I always look for the stamped on markings.

No harm done just blown fuses. Be sure to correct the battery cables before replacing the fuses otherwise it will just blown them again... That is why the fuses are there haha... That would be a second trip to NAPA to get more fuses...

Roy Ken
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Old 07-22-2015, 10:49 PM   #5
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Originally Posted by RoyBraddy View Post
Most have an in-line fuse close to the battery and two more fuses on the 12V Power Distribution Panel labeled REVERSE POLARITY.

All three of these fuses will blow if the battery is hooked up backwards.

I always look for the word 'NEG' or the symbol '-' stamped on the battery case. Then I make sure this is the battery cable coming from the frame ground.

The RV's can have either BLACK and WHITE cables where BLACK is positive 12VDC and WHITE is frame ground or they may have RED and BLACK cables where RED is positive 12VDC and black is frame ground.

Just to be safe I always look for the stamped on markings.



No harm done just blown fuses. Be sure to correct the battery cables before replacing the fuses otherwise it will just blown them again... That is why the fuses are there haha... That would be a second trip to NAPA to get more fuses...

Roy Ken

thank you
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Old 07-23-2015, 03:51 PM   #6
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i found the fuse 15 amp old tube ones i'll pick up a new ones thanks guys
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Old 07-23-2015, 06:07 PM   #7
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We did this once. Ours has just one fuse affected, close to the battery.
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Old 07-23-2015, 06:26 PM   #8
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yes that the one that blown had a hard time finding it my was under the table seat

it 's 15 amp go in the morning get a new one and some spares
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Old 07-24-2015, 11:33 AM   #9
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I've done this twice. There's a fuse on the wire right next to the battery that I've now had to replace...twice. Since then I've used a significant amount of tape to clearly color code the connections.
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Old 07-24-2015, 08:17 PM   #10
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I've done this twice. There's a fuse on the wire right next to the battery that I've now had to replace...twice. Since then I've used a significant amount of tape to clearly color code the connections.
thank you good idea i will do that to mine
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