Pro Flo 4 Timing

TurboGLH said
it's easy enough to check power at the sensor key on vs running

I'm sure it is - but I haven't done it myself as I only just had this thought as I read your post (and I'm still at the office for now...).

I know they should be isolated, and shouldn't be affected by minor voltage fluctuations, but now I want to check and see.