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Old 08-23-2013, 02:01 PM   #15
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If you zoom in the picture, it says: Input:9-19V 2.0A max and output: 12V 800Ma.
Kinda like what they put on an appliance. That's all the current/voltage/amps it should draw and put out.

Make sure they know that it has to be maintained on a trickle charger or another source of 12 volts.

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Old 08-23-2013, 02:03 PM   #16
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Originally Posted by SmokeyWren View Post
The tow vehicle's electrical system limits the amount of juice that flows through the trailer plug and into the trailer. The 12-volt hot wire coming from the trailer plug on the back of the vehicle doesn't flow enough juice to charge a dead or discharged battery. You need a separate battery charger for that.
Originally Posted by halfwright View Post
Still confused.
You are saying that the tow vehicle limits the flow. Then, that should be a good thing if all you want is 2 amps.
The only way the tow vehicle 'limits the amount of juice" is that there is a fuse in the circuit that will blow if the current exceeds it's capacity. The charger in the break-a-way box won't pull that many amps even when the battery is dead. The only thing to consider is don't install the battery until it has been charged on a small separate charger. Once the battery is charged and installed, the wire from the tow vehicle and the built in charger will MAINTAIN the battery when hooked up. If you leave the trailer parked for a long period of time (weeks?) you should either remove the battery and put it on a float charger or hook one up to the trailer where it sits. It's a small battery, it can't stand a +10 amp charger, it will overheat or blow up.


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Old 08-24-2013, 06:19 PM   #17
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I must disagree about the 12V hot wire and battery charging. Our 5er had 2, 12V batteries that were re-charged by the truck alternator. I ran them down several over-night stays and they re-charged the next day while on the road. This is why a separate 10Ga wire should be run from the towing vehicle's battery back to the Bargman plug at the hitch instead of tapping into a hot wire somewhere. Today most vehicles set-up for towing come standard with that wire in the factory tow harness.
BTW, you do not need a special battery for the break-away, it is only a motorcycle battery, just buy one the same AH and size as the old battery. I've replaced the break-away batteries on my farm and cargo trailers many times over the years. They are required by law in Indiana for all trailers without house batteries.
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Old 08-24-2013, 07:35 PM   #18
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Ray, IN, both trailers mentioned in this thread are utility trailers, not travel trailers. Yes, your 2 full size batteries require much more current and wire capacity from tow vehicle to trailer than the small battery being used for emergency only. Your 5th wheel used overnight will use much more electricity than a utility trailer. Your alternator will easily charge your batteries in a few hours of travel. The same alternator will top off and maintain the small utility trailer battery that has no current draw until break-a-way switch engages. That small battery will need very little current and can easily be charged through the 6 or 7 pin umbilical between tow vehicle and trailer.


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battery, brake

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