Glow plugs always getting power!?

[rammertide07]

Originally Posted by cleatus12r

So that was between the ground terminal of the battery and the post of the GPR that has the yellow and brown wires?

Normal. You're measuring voltage drop across a resistance (glow plugs).

After I hooked everything back up, I measure the relay output again. The volt meter was reading 0v on the second go-around....first time it was measuring .7v.

I appreciate all your help and time. I know some mechanically inclined people that can give me some hands on explanation. Just talked to an ASE mechanic, now he's confused

The way I'm looking at it, the glow plug side of the "tree" is a dead branch...not connected to any type of power source, since the negative cables are not connected. The "glow plug feed" side of the circuit is not suppose to have continuity with the + side of the batteries until the GPR is engaged. Thats the way I look at it...

I'm going to do some research on automotive 12v systems and relays.