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Old 10-02-2013, 01:04 PM   #1
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40 amp circuit breaker

We just bought a new Excel 5er and in my manual it says I need to have a 40 amp max. circuit breaker on the charge wire circuit. Our tow vehicle is a 2012 ram 3500 DRW. Does anyone know if new trucks come with this protection or do i have to install those.

Shawn.
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Old 10-02-2013, 03:36 PM   #2
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My 2000 Dodge 3/4 ton. had a charge system relay and 30 amp fuse in the trailer tow package.
Details should be in your owners manual , in the power distribution center section. Along with the fuse / relay position info.
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Old 10-02-2013, 03:44 PM   #3
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If the charge circuit was factory on the truck, then it would have a breaker or fuse on all circuits. I would think a reference to this and the amperage would be in the owners manual. If you can't find it, a call to the Dodge dealer should take care of it.
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Old 10-02-2013, 06:40 PM   #4
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Your factory Dodge system should be just fine. The charge circuit is fused, or has a 30 amp CB or relay. One thing you will find out, is--you will never overcharge your trailer batteries with the tow vehicle--just ain't gonna happen. More than likely, you will find it has trouble doing more than just keeping up with what you might be using.
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Old 10-02-2013, 07:39 PM   #5
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Quote:
Originally Posted by wingnut60 View Post
Your factory Dodge system should be just fine. The charge circuit is fused, or has a 30 amp CB or relay. One thing you will find out, is--you will never overcharge your trailer batteries with the tow vehicle--just ain't gonna happen. More than likely, you will find it has trouble doing more than just keeping up with what you might be using.
Joe
I agree. I can't imagine a 5er in tow would use more than 6 amps for the 12v systems that are left on. If the batteries were in decent condition, the amp draw from those wouldn't be more than 10 and that wouldn't last long. Certainly 30a would cover any draw while traveling.

Even if a full 14.5v made it to the batteries (which it won't with that long of run) 14+v will never hurt the batteries. Actually, 14.5v is good for them for desulfation periodically. I know in my A, my house batteries are getting 14.5v 8 hours a day while driving. They are 8 years old and still in perfect shape. I know if I was towing something and it sucked 40amps, something would be very wrong.
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Old 10-02-2013, 09:11 PM   #6
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Almost every truck with built in charge line has a 30A fuse for the 12VDC power charge line. You're fine.
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Old 10-03-2013, 04:10 AM   #7
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Thank you everyone.

Shawn and Julie
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