[TR] Yeah, I know, the Overdrive...Again....

[Randall]

> Cars built back when your TR3 was don't have diodes anywhere in them.
> Heck, even the radios were tube-type not the new-fangled transistor kind.

Quite true, I did not mean to imply the diode was original in any way. The diode is purely a workaround to the problem I had.

My guess is that the original relays used a different contact material that was more resistant to the effects of the spark. Perhaps silver or even gold plated silver. Tungsten is another possibility.

Today, solid state diodes are common and cheap. Many automotive relays even have them incorporated, to protect Solid state ECU drive circuits. So I'm guessing that even the reproduction relay I got used less expensive contacts that are less resistant to arcing.

But all I can say for sure is that it worked for me.

If you are worried about a concours judge spotting it, you could always hide it under the solenoid cap. At the relay was just a lot easier place for me to access. And my TR3 is definitely a driver, not a show car.
-- Randall
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