adding a second battery to my 2002 f150


Old 10-23-07, 01:55 PM
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adding a second battery to my 2002 f150

I would like to add a second battery to my f150 to run an inverter. I would like to place the battery under the tool box but would like to charge it from my alternator. Is this possible? Thanks
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Old 10-23-07, 02:25 PM
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Anything is possible.

You would have to connect this battery in parallel with the other one.

Your stock alternator might not be able to handle the extra load, so check the specs on that.
Old 10-23-07, 06:06 PM
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Check RV shops or catalogs. You need a battery isolator. This allows the alternator to charge both batteries, but blocks the accessory battery from drawing down the primary starter battery.
Old 10-24-07, 01:08 PM
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Thanks for the help!
Old 10-24-07, 10:32 PM
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Goldstar's got it, and most auto parts places carry them (I know pep boys does). A 2 battery unit is about $50, plus associate wiring, a 3 battery unit slightly more.

I had one in my conversion van, you will get better results if you use two 6 volt golf car batteries in series than a single 12v battery.

Don't skimp on the wire, insulate all connections and tie back all wiring so it doesn't rub. If the right connection breaks, you could send 30v+ to the battery.

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