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charger for trailer battery

S

Steve-Maine

Member
I'm looking for a battery charger for battery on my 12 ton trailer. It needs to run off truck when towing. The trailer has 8 wheels and battery is like small tractor battery. All the ones I have found will only do two axles,4 wheels. Thanks for any help
 
What would the number of wheels have to do with battery charging requirements? If you have the round trailer connector on your tow vehicle one of the pins is a charging circuit and should do the job fine.
 
All you should need to do is hook it up to a hot lead from the truck which in turn would charge the battery when you had the engine running. When parked a simple solar charger would do just fine to keep it charged
 
I wonder if he is instead wanting a brake controller, I know many of those are rated in axles they will drive. IE, magnet load.. etc..
 
If your talking about just a breakaway kit battery, reguardless of battery size,here is what you need. This won't charge enough if you use the battery for hydraulics or a winch, but it is the best available that won't overheat your battery and runs on 12v. If yoy are using your battery for more than braking, then you should put it on the charger when parked since plugging into the truck power wire has several problems associated with it.
charger
 
(quoted from post at 13:55:26 01/03/15) What would the number of wheels have to do with battery charging requirements? If you have the round trailer connector on your tow vehicle one of the pins is a charging circuit and should do the job fine.
Click to expand...

You need a diode isolator if you hook up a trailer battery to the vehicle.
 
Yes, you need some type of battery isolator for the trailer battery, that way the trailer battery can't feed the truck battery if the truck battery fails or goes dead. I have seen a bunch of burned up wiring because of that.
 
(quoted from post at 12:44:44 01/05/15) Just wire in a diode.
Click to expand...

The current rating of the diode must be above that of the highest current it will see and a heat sink may be needed.
 
Usually if the trailer comes with the battery, it is already wired to the 12V pin on the plug.

In order to charge, some trucks need a relay, or a fuse, or a wire connected under the hood. The old GMs had a 40A fuse that needed to be installed in the electrical panel on the left front fender up under the hood, for example.
 
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