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EFV-8 Club Forum / General Ford Discussion / Adding 12V battery to starting circuit of 6V+

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Discussion Topic: Adding 12V battery to starting circuit of 6V+

ford38v8

08-27-2011 @ 11:09 AM

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Ole Bill, oldford2 pegged your underlying problem. Before you go and do some dramatic "fix" as you propose, consider correcting the problem itself rather than "fixing" the symptom.

Resistance is the problem, and to rid your electrical system of this problem, you begin at the battery, following the paths of electricity through the circuits back to the battery again, cleaning and assuring an unimpeded flow of electrical current. Preventing future resistance at these points is accomplished simply by shielding the contacting surfaces from oxididation by the proper use of a dialectic grease, available at any auto supply. Also as oldford points out, undersize cables and wires must be replaced with their 6v capable counterparts.

The gorilla in the room is the starter motor itself. Worn brushes, weak springs, armature wear, and mica interference being the main causes of resistance in starters, any competent motor repair shop can properly rebuild your starter in a matter of an hour or so. This step alone should rightly be considered part of all routine electrical system checkups, yet is so rarely done that it is likely that half of all 12v conversions have bad starters.

Alan

oldford2

08-27-2011 @ 4:05 AM

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Sounds like you are going to spend money and time to "patch" a starting problem. Could be as simple to fix by cleaning all connections and using 6 volt cables (12 volt cables won't carry the amperage required). John

supereal

08-26-2011 @ 5:50 PM

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You could operate two six volt batteries in series, and charge them with a 12 volt generator and regulator, and run the vehicle on six volts by "center tapping" the battery bank between the batteries, while feeding the starter 12volts. I am in the dark as to why you would do this if your six volt system is in good shape. My six volt cars crank well and start easily.

ole_Bill

08-26-2011 @ 1:18 PM

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Recently someone posted a schematic explaining how to add a 12V battery to a the starting circuit of a 6V+ system without changing the whole system. The battery was connected only to the starter, used a seperate starter button under the dash and did not charge off the car's system. Could you please post this info again? I printed the original but have misplaced it. Thanks

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