In spite of what some say here, you can have either positive or negative ground with a 6 volt system. The starter, generator, or voltage regulator doesn't care once the generator is properly polarized to match the configuration of the battery connections. I've run my Super A with the 6v pos to ground, then swapped to negative ground and it worked just fine for 2 years each way. Just recently put it to 12v with an alternator, and both I and it are much happier.
Anyway, to polarize the generator, take a piece of 12AWG wire with a short bit stripped from each end, and with one end on the "A" (larger) terminal of the generator, momentarily touch the other end to the "Bat" terminal of the voltage regulator, or the NON-grounded terminal of the battery (or starter lug). It should spark. All it takes is a 'touch'.
To check your generator, disconnect the wire from the "F" (smaller) stud of the generator, then with the engine running at least half throttle, take your length of wire and with one end on the engine block (or other good 'ground'), put the other end on the "F" terminal. Have a helper look at the amp gauge - it should show a charge.
There is a good possibility that when you jumped the 6v with a 12v battery, you cooked the regulator.
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