Hi Ron - thanks for the information. Yes, it is a momentary hiccup when you flash the high-beam lights or with a couple other relays - including the A/C relays that are used with the Vintage Air system Dad has installed. I will be leaving to head back to AUS tomorrow so we will not have time to test your theories with the capacitors & diodes before I leave, but I will forward the info on to Dad's e-mail and maybe he can try it. I do believe your theory has a lot of merit, and I've convinced Dad to try a known good ECU to see if the problem still occurs. Unfortunately, many of the ECU's could suffer similar symptoms given they are all old. Funny thing is, most seem to be trouble free, so I am still wondering if there's some way that the circuitry that protects the computer could have been inadvertently damaged when Dad had some welding done on the car a while back.
Regards,
Greg
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