OK, I made a harness for the EHA and decided to try it out on my 560SL first, to see what good readings would look like. I don't know which pin is neutral and which is hot, but I put red on pin 2 and black on pin 1.

I'm using the Sears 82139 digital multimeter (with duty cycle). I've got it on the mA setting and I'm reading 0 mA at all times, from startup through about a 5 mile drive. If I switch it over to VDC, I get constant change in the voltage, but I can't seem to get a current reading. The 560SL is not hard to start. It needs new engine mounts and has a noisy lifter when cold, but is otherwise running fine.

Why would I not get a current reading?

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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino