After replacing the coil with a Bosch part, I checked it with a simple circuit tester and there was barely a dim light indicating not getting much current to the coil.

I will have to look at checking the alternator and dynamo (not sure what this is?). Any ideas on how to check the transistors and diodes?

Grateful for your advice!

A bad alternator ( the part that recharges the battery ) won't prevent a car from running.

We need a wiring diagram for the ignition system on this car to determine what to test next.