In my post, if I said red/purple was ground, I mis-spoke. I'm aware the red/purp is feed. Red/brown is ground, provided by the ECU. --- In dmcnews@xxxxxxxxxxxxxxx, "David Teitelbaum" <jtrealty@xxxx> wrote: > I think you are a little confused, The red/purple wire from the ECU is > a feed (not a ground). > You could put a 12 > volt bulb across the wires at the plug for the frequency valve, it > should light dimly and fluctuate in brightness. > David Teitelbaum > vin 10757 I have an icepick probe that would do the same thing. The bulb fails to light.