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I have a Bosch Coil on a 58 TR3A with positive ground. It has + and - markings, which side should be wired to the distributor and which side to vehicle power and if I switch the car to negative ground, should the connections be reversed?
"+" would go to the distributor and "-" would go to the switch (vehicle power). And yes, it would be the reverse should you convert to negative ground.
The car will still run with the coil connected backwards. Might not run quite as well, but usually you can only tell the difference in how easily it starts or how long you need to keep the choke out to keep it running smooth.
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