I have 2 EHAs that should be good (one of which was new 2yrs ago). I've swapped both in & nothing changed.

Which doesn't say that they both could be bad I guess, but those are long odds...

I supposed I should look at the wiring for the EHA for a short though...

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress