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I think I found the trouble - had a no start about 2 weeks ago. Tried to start it about 5 times and no firing at all. Swapped the fuel pump relay with the rear dome relay next to it and it started immediately. Has started every time since, even this morning at 0 degrees. We will see what...

There probably was no spark either, I will clean and grease (dielectric) those connectors too and wait for -15 degrees again. I will keep you posted, thanks again

I'll try plugging it in when it gets cold again but the fuel pump should still run when cranking and since its not getting voltage I was wondering if it could be ice in a connector or relay? Hopefully I will have time to check connectors and maybe swap relays during this warm spell we are having.

Isuzu question: Just bought a 2009 npr-hd 6.0 gas. Starts right away except if it is -15 degrees overnight, then it cranks but no fire. Checked voltage to fuel pump at pump when cranking and had no voltage. Ecm is getting power though. Will start when it warms up to 15 above. ?? Thanks for being...