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An example where a commercial relay was used when perhaps a mil spec relay should have been used. Catalog sheets from the 1970's show what was used and what was available. Cost must have been a big factor....

Another example of hiding compromises in design. On the right is the new flasher circuit, assembled with Radio Shack parts and encapsulated in black epoxy. This one didn't even have overload protection, it blows like a fuse when exposed to a shorted light filament (circa 2001). The circuit...

Corrosion. All components are corroded and the printed circuit board has no conformal coating. It is a fallacy to assume that a welded steel box is water proof when the connector is installed with a gasket. Water molecules will enter and water accumulate. This one has a 1/8NPT pipe plug (also...

Got a junk control box today from a parts M925 in Mt Airy, NC. I'll cut it open and see what I can find about what makes it tick or not. It is a WSU-4003UT ord number 11669304. The M925 is a 1996, I think.

You probably used a "Megger", pretty expensive piece of equipment for a normal mortal....

Thanks Chris, I'm always a bit sceptical about fancy electronics, especially when so much depend on it. A by-pass procedure should be available, even if it means disabling an important(?) feature such as the CTIS. I'm glad the birthday party was a success. :-)

Chris, if you end up with an extra unservicable unit, I'd like to take a look at it, if you wouldn't mind sending it to me. Thanks.

According to the 272-20P it is 2590-01-144-8674

Check the status of the "neutral start" switch, wires 498 and 499.

Chris, it looks like the "protective control box" is a bit more complicated than the one used in the 809 series. With a wiring diagram on hand, it would probably be possible to bypass it, pretty sure the simpler 809 box can be.