Not sure what the chance is, but it looks like the GM sold me bad relays. Got a cheap one for 20 bucks from a part store and they both start up now. This is what i dont get. I hear a click when i turn the key on and no other ones after that. 12v at the top and then out the bottom, but it never cycles down. I thought that 12v in the top cycle down and 0 out the bottom to know that the glow plugs are off. From what the metter said 12v out the bottom all the time. So i think my gp are staying on. So now what the heck could it be? this must be my 100th post about my starting problems. i think i am getting closer..... as aways any help would be great. thx!!