Gryphon not operating under ambient temp of 40 deg.

[Longshot270]

When was the last time you had your battery and alternator checked?

You could either find a set of those needle testers that poke through the insulation and say hot or cold. Wherever resistance is absolute when it shouldn't be, check connections on that wire. One of the multimeters would be more useful. The needle testers usually use an LED so even .1V can easily light it up.

I'm not sure how to check the injector.