fuel pump relay?

9-12volts? Peter, explain this one please. Could it be the dreaded oil pressure switch scenario?

howie ll wrote: ... the dreaded oil pressure switch scenario?

You mean... no!!... not people that use oil-pressure to control f..ff.fff.fuelpumps?       Thou art cruel! But no, I'm merely responding. Earlier I was thinking some high-impedance voltage may be being measured (ie, the 9V) - not that charging system variation has been discounted - but I thought KIS. Or, not yet... at least. And using a relay-coil's pull-in and drop-out behavior as a voltage window sensor has worked often for many. (IE - drop the voltage. A resistor may be ok, but diodes have a essentially a constant voltage drop that is more current independent.) In some cases that easier than diatribe. Besides, if the 9V output becomes a "normal" 0 (off or low or 0V), then just remove the add-ons above.