With the key off the only stud that has power should be the big one closest to the passanger side.

You should have the same or close to the same voltage across the GPR when its on. Little tough to throw a number at it, as every truck will have differant voltage in the batterys.


BTW, Welcome to the site!!!

 

Just went out and re-checked the GPR and this is what I found....with the key off, I have no power on the two smaller studs....with the key on, I have power on ONLY ONE of the smaller studs (the stud closest to the other relay) and the stud closest to the fire wall has no power. That tells me power is not going across the relay correct? or could there be anything else that would cause the relay not to work. I don't know much about diesels so I have to ask.

 

Just check the big studs... But you should have power with key on to both smaller studs.

 

Thanks for that diagnoses, It was spot on, and yes I have power to both big studs and only one small stud "with the key on". I will be going out to get that GPR you suggested.

 

With the key on and power to both big studs then you are fine, the GPR is working. Time to dig a little deeper...

 

Well then is it normal to not have power to both small studs with the key on

 

I dont know, I would have to go test mine.

But if you have power to the drivers side of the GPR (big stud) then your GPR is working.

The small studs are controls,

 

OK.. That makes seance. I did test the voltage on the drivers side stud and I get 10 volts, I have both my batteries on charge now to see if it makes any diff when I try to start it later.
Is it possible that I am loosing fuel pressure wile the truck sits for a wile??

 

No, you have an electric fuel pump, when you turn the key on the pump starts and pressurizes the rails. All PSD's will show 0-10psi fuel pressure in the rails no more then 30 seconds after shut down.

You could have a HPO res issue, but I doubt it. Next time you cold start it, before you crank remove one of the small caps on the HPO res and see if there is oil in there. Should be within 3/4" of the top.

 

Ware do I find the HPO and what does that stand for