OK....I just checked my TR3B which has + ground, and as best I know, it's the original coil, and the points and condenser have been in for years, and are in good shape. The white wire from the ignition switch goes to the coil terminal marked "CB", and the other coil terminal is marked "SW", which is a white wire with a black tracer, and it runs to the distributor. The reason I'm asking is that I met a local guy with an unbelievable original 62 TR3B, (TCF 530 L). It's been in his family since new, and only has 40K miles on it! He was doing a tune-up and couldn't get any spark. The coil that was on it was a replacement, and it checked open from the + to the - terminals. He bought a new coil, and it is also marked + and - . I was checking his ignition over, and we get 12 volts to both sides of the coil, and to the terminal in the distributor when the ignition is on. But there is no spark from the secondary side of the coil, and when you turn the engine over, no slight spark as the points open and close. If you check a coil with an ohm meter, what resistance readings should I get between the low voltage terminals, and the low voltage terminals to the high voltage side?
Thanks for the answers, I hope I didn't confuse anyone.....
Boy, this guy has a GEM of a TR3B....everything original, still has all the tool kit, the felt pad in the trunk, and there is still red paint inside the wheel wells!!!!! Absolutely NO rust!!!!
Thanks again,
Don