24V/12V accessory question

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Jun 30, 2007 | 08:31 AM

donn

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24V/12V accessory question

This is probably simple, but I'm a simpleton when it comes to electricity.

My 6.9L diesel engine ('86 F250) apparently has a 24V system, at least for part of the electrical system. The 2 batteries, I believe, are wired in series.

I have a 12V Quick-Air inflator which has alligator clips for attachment to the battery, to inflate tires.

How do I connect it to the new truck's battery(ies) to avoid blowing up the compressor in the Quick-Air? Can I just clip them to + & - posts on one battery, and get 12V?

Thanks in advance.

Jun 30, 2007 | 10:13 AM

donn

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Wrong again. The batteries appear to be wired in parallel. I clipped the QuickAir to just one, and it worked fine.

Jun 30, 2007 | 08:07 PM

Franklin2

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From: Virginia

Your batteries are in parallel for more capacity, but the same 12 volts. Diesels are hard to turn over, and the glow plugs use a lot of current, so they need the two batteries.

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