Chris,
I unplugged the yellow wire, and connected the positive lead of the multimeter to the yellow wire, and grounded out the neg of the multimeter. The car was not running, just with the ignition on.
I was a little weirded out by the results. It sort of ranged between 6.8V and 3.4 it would float up and down and up and down. (must be something in the fuel gauge?)
Does this help you?
Thanks mate.. it all helps a bit
By the looks of those results, you might be replacing the electro-mechanical regulator soon as well
I will post a write up when I do it.
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1971 Datsun P510 SR20DET 276 rwkW
2005 Mercedes AMG E55 350 kW
1969 Datsun P510 L20B EFI 95 rwkW
1975 Ford XB Fairmont GS Wagon 179rwhp
1980 Escort Van SR20DET unfinished
2002 Suzuki GSX1300R Hayabusa 185hp