Quote:
Originally Posted by Ole Don
A good friend owns a stock 54 Lincoln. Even with a new six volt battery it would not turn fast enough to start. He found that two six volt batteries would fit in the hole, so he has been using that for several years now. It starts very well with two wired as six volts, lots of amps.
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ALL the battery and starter cables need to be "0" / Zero gauge wire, not the smaller sizes, they won't carry enough current for the starter. Don't forget the Ground half of the starter circuit: bellhousing / engine block and any connections back to the Positive terminal of the battery.
IF turning the engine fast enough to get it to start easier is a problem... you can run the starter on 12 volts without affecting the rest of the car at all.
Assuming the car is still Positive ground... you can connect a second 6v battery in Series between the starter solenoid and starter. It will spin the starter with 12 volts, image 2 below. The extra battery will eventually need to be connected to a charger.
If your battery and starter cable connections on the starter solenoid are reversed from this diagram that's normal. Those two larger connections are interchangeable & reversible, image 3 below.