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This is why I like points. You can open/close them with the ignition on and SEE if current is getting through the dash, switch, ballast resistor, ponts and ignition all in one little glance. Once you've determined that on your solid-state version, you must have a good ground on the outside...

Chrysler did some stunt in at the intro of the alternator, where they started the car, took out the battey and made some big drive to point out the reliabilty of the alternator. That was a mechanical voltage regulator, not the solid-state. THE MAIN REASON for dim lights, low charge at idle...

For many good reasons, the secondary (hi-voltage) circuits were kept as short as possible, and ON the engine. One end of the coil's secondary is usually the case, and electrically, "wants" the see the best possible path back to the outside of the spark plugs. This is ideally through a well...

Diodes can fail 2 ways. Opened or shorted. We don't see the shorted example nearly as often as the open. When all 6 work, the alternator is strong, but if one or more open up the alternator works but is weak, and a unique whine emanates from the alternator ( can be heard in the car). This...