I remember old 12 volt batteries, the kind with the lead bridges on top that would sometimes have a stud sticking out of the link between the 3rd & 4th cell (2 volts each) that would give you 6 volts. My dad had plenty of old construction equipment that had 2 or 4 six volt batteries wired in series to give you 12 or 24 volts and depending on where you placed your tap wire between batteries, it would give you 6, 12,or 18 volts on the 24 volt system.
We also had two 12 volt parallel-wired batteries hooked up to an aftermarket dual solenoid starter system in a Westinghouse/Le Tourneau scraper that, when you hit the starter button, disconnected the 12 volt electrical system from the scraper, re-connected the batteries in series to give you 24 volts to the starter and once it started and you released the starter button, it switched back to 12 volts and re-connected to the rest of the electrical system- whew!
If you tapped into any of the bridges between the 2 volt individual cells on the 12 V battery below, youd get ever increasing voltage, 2 volts at a time. Thats probably how he was doing it.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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