The generator would need to be polarized after reversing the battery. With all connections correctly assembled, with the key off and before starting the engine, remove the field wire at the regulator and momentarily touch it to the battery wire connection on the regulator. You should see a small spark. Reconnect the field wire to the regulator.
If this is a gas engine, look at the wiring to the ignition coil. For a positive ground system the + terminal will connect to the distributor, the - terminal will connect to the ignition switch.
Once it's running, check across the battery with a volt meter. With the engine above 1200 RPM or so, the voltage should be around 8 volts.
If there is an ampmeter, it should be showing in the middle with the ignition off, the positive direction with the engine running and revved up, and the negative direction with the engine off and the ignition or lights on. If it reads backward, reverse the wires on the back terminals. If it's a "loop" type meter with just a wire passing through a loop, reverse the direction the wire passes through.
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