Why do cars from this era fail at electrical connections before they fail mechanically? Because a mechanical component either works or it doesn't, and when it stops working you fix it. Electrical connections degrade gradually — they corrode, they loosen, they develop resistance that creates heat and intermittent faults.

The correct solution is to go through every connector in the car, disassemble it, clean it with electrical contact cleaner, treat it with dielectric grease, and reassemble. It's time-consuming and not glamorous but it eliminates the entire class of electrical gremlins that plague vintage cars.

Do this job once on a freshly restored car before any problems appear and you'll never troubleshoot an intermittent electrical fault again. Do it after the problems appear and you'll do it anyway but with more frustration.