Re: 9 volt system
Along with the 8V battery there also was a dual 6V with an added solenoid to give 12 volts for starting only. The 2 sixes normally ran in parallel until you tried to start the engine, hit the button and the solenoid would engage putting the 2 sixes in series to give a big boost to the starter. I used one in my 54 with a very tired 236, always started but was hard on the starter.
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Terry
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