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Old 12-12-2007, 03:04 PM   #1
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Charging Auxiliary Batteries

Well, this isn't really a repair (or even an Airstream) related question but maybe someone can answer it for me ...

I carry 2 12-volt (in parallel) auxiliary batteries mounted in the bed of my pickup to provide 110v AC through a 300 watt inverter to power some AC work tools at remote job sites. I know that my truck's alternator charges my trailer batteries when I am towing so my question is this: is there a way to tap into my 7-pin wiring harness and connect my auxiliary batteries to my existing electricals and have the batteries charge off my truck alternator when it is running?

Thanks in advance for any info on this.
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Old 12-12-2007, 03:37 PM   #2
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You will need a battery isolator like this

Powerline Multi-Battery Isolator
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Old 12-12-2007, 04:19 PM   #3
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You will also need a lager alternator or on some trucks you can have two altenators. One will ont handle three battries unless it is a heavy dudy unit.
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Old 12-12-2007, 04:44 PM   #4
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Quote:
Originally Posted by COLORADO_CAMPER
Well, this isn't really a repair (or even an Airstream) related question but maybe someone can answer it for me ...

I carry 2 12-volt (in parallel) auxiliary batteries mounted in the bed of my pickup to provide 110v AC through a 300 watt inverter to power some AC work tools at remote job sites. I know that my truck's alternator charges my trailer batteries when I am towing so my question is this: is there a way to tap into my 7-pin wiring harness and connect my auxiliary batteries to my existing electricals and have the batteries charge off my truck alternator when it is running?

Thanks in advance for any info on this.
You would probably be better off by charging them at night by a 3 stage charger plugged in to your home via extension cord and using a solar panel to keep them charged all day while out on the job site. Check with Northern Tool for somenice chargers....both 3 stage and solar.
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Old 05-27-2008, 04:01 PM   #5
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So can this be done?

"is there a way to tap into my 7-pin wiring harness and connect my auxiliary batteries to my existing electricals and have the batteries charge off my truck alternator when it is running?"

Just looking to recharge one battery, so I can have lights and run a water pump from time to time.
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Old 05-27-2008, 04:55 PM   #6
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You can tap it at the 7 way plug, but you can just run a wire to plus pole of the regular battery and hook on with a clip when you need to charge. A battery isolator lets you charge the truck battery and the extra but keep them electrically separate. Without an isolator, if you leave the aux connected, you can drain the main battery too and not be able to start. Our PU has a winch, so I have two batteries and a selector swtch and an isolator. When I need to use the winch I select either battery, but not both so that if I run one down, I still have the other to start back up.
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Old 06-02-2008, 07:17 AM   #7
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So if I had a plug with only one black wire, removed the other six wires, then attached that black wire to the positive post on the battery, while driving, it would recharge the battery?

No negative wire is needed?

Thanks all
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Old 06-02-2008, 08:38 AM   #8
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You will need the ground too
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Old 06-02-2008, 08:21 PM   #9
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So if I had a plug with only one black wire, removed the other six wires, then attached that black wire to the positive post on the battery, while driving, it would recharge the battery?

No negative wire is needed?

Thanks all
Like Aerowood says, you need the ground too. You also might look at a little device called an 'echo charger'. This will enable you to charge your battery from the TV battery directly, as it acts as a charge controller of sorts.
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Old 06-09-2008, 10:16 AM   #10
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Aerowood and Lewster,

Thanks to both of you.

Geno
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