I am certain it is not the FPR. I swapped it with the one from my 190E. The problem with the 300SEL remained constant. The 190E (with the 300SEL FPR) is still running perfectly.

I haven't checked the tach to see if it is working. I'll do that.

With jumping between 7 and 8, voltage between 10 and 11(ground) is a constant 5v DC, except in the 'off' position where voltage is 0.

So if I'm looking at a wiring problem, where do I begin my search?

Thanks.
-Brett