Well I put red probe into pin 3 on the left fender and black to engine ground and set to duty cycle %. I got a constant 69.9 with engine fully warmed up, at idle and at 2000 rpm's.

Does this point to a possible EHA problem? To test EHA, do I absolutely need the test cable to test it accurately or can I do some preliminary tests with just my digital multimeter?

TIA as always! *edit -- OVP is new

~Paul

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'91 300E, 215K miles