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Old 08-08-2013, 05:47 PM   #1
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Charge wire questions for toad battery

What size/gauge wire do you use to run a charge wire from the MH to the tow car.

Do you use the coiled wire connector that is used with the taillights and the six way connector? or run a quick disconnect pair of wires separately?

I tried running it through the 6 way and I must have done something wrong as the socket on the car side was very hot. Not sure if there was a strand touching the socket housing or not. I was using 12 ga which was hard to get in the small 6 way pollack connector screw fitting, which is why I suspect maybe one of the strands is hitting ground.
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Old 08-08-2013, 06:36 PM   #2
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If you have found the correct always hot wire in the 6 pin and ground it should work. As you commented I think you may have a wire whisker strand touching where it should not.
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Old 08-08-2013, 07:34 PM   #3
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If the toad battery and RV batteries are both charged, there would be little current flowing from one to the other. I use the 12 v wire in a Blue Ox 6 pin coiled cord between RV and toad and not had any problems in thousands of miles of towing. I also have auto reset circuit breaker in the line from RV chassis batteries to plug and cord, then another in toad from battery to plug. The CB is just to insure no problems when connecting/ disconnecting.
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Old 08-08-2013, 09:11 PM   #4
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Thanks, I'll put a fuse in on the motorhome side.

Do they use 12 ga wire on the commercial battery charger kits or somethink like 14 or 16. I am not sure what size is in my roadmaster coiled wire
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Old 08-08-2013, 09:14 PM   #5
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12awg should be minimum for charge line, and 10awg for ground.
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Old 08-09-2013, 07:55 AM   #6
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Originally Posted by Flattrip View Post
Thanks, I'll put a fuse in on the motorhome side.

Do they use 12 ga wire on the commercial battery charger kits or somethink like 14 or 16. I am not sure what size is in my roadmaster coiled wire
An auto reset breaker might be a better plan. It can be pretty easy to blow even a 30a fuse. 20a auto reset will trip then reset itself. Common to use one on each side.
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Old 08-09-2013, 01:29 PM   #7
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Originally Posted by BFlinn181 View Post
If the toad battery and RV batteries are both charged, there would be little current flowing from one to the other. I use the 12 v wire in a Blue Ox 6 pin coiled cord between RV and toad and not had any problems in thousands of miles of towing. I also have auto reset circuit breaker in the line from RV chassis batteries to plug and cord, then another in toad from battery to plug. The CB is just to insure no problems when connecting/ disconnecting.
when both are fully charged, my rv battery is 13.7v and my toad battery is 12.6v. i don't have a large amp meter so have not tested what amps are to flow through. do you have a guess? I put an 8a fuse in the line and it has not been blown yet
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