Oliver,
To check if car was positive or negative ground, check the primary
connections to the coil. If the car is still wired as positive ground,
the coil terminal marked CB (or +) should be going to the distributor
and the terminal marked SW (or -) should go to the ignition switch.
Since the car was started with the battery hooked up a negative ground
(negative terminal going to the chassis of the car), the generator may
well have switched polarity. You can either make the other necessary
changes to make the car negative ground (switch the primary connections
to the coil, switch the wires on the ammeter and flash the generator for
negative ground), or you can swap the connections to the battery and
flash the generator for positive ground. There is no compelling reason
to have the ground positive or negative, it is just up to the owner
which way they want it to be. The only reason to keep the car positive
ground is for originality. There are two reasons to change the car to
negative ground - 1) it makes the car compatible with all modern day
electronic devices if you ever want to install such things and 2) all
services places are familiar with negative ground vehicles and are less
apt to make a mistake when installing things like new batteries.
Cheers,
Dave
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