There is no grid heater in the LB7, just a coil heater in the intake. Having said that, it should start at -45*F. I've done it with good glow plugs. She will not like you....It will come up on 3 cylinders and you can count they cylinders when they come up....
It sounds like you have a couple of bad glow plugs.
I've talked to Rok, and he is a good guy, but he is just learning about D'maxes. He is mostly a Ford and Cummins guy, but he is learning about our rigs. He is about the best I have seen in this area.
The best bet is to plug her in.....
Thanks. I got her plugged in for the night hopefully have better luck in the morning. I'm going to give Rok's a call tomorrow see if he can get me in to give it a going over. Glow plugs hard to do yourself? I have access to a full shop and consider myself decent when it comes to working on stuff but never touched a diesel before.