Next time I'll definitely be checking for the relay to click. I've also brought the multimeter home, so I can have an easier time troubleshooting.
If the relay doesn't fix the issue, I'll be looking at the ignition switch in very close detail. Last summer I had an issue with no response from turning the key (no lights, no clicks, no cranking). It was very, very seldom - perhaps 3 times overall.
Are there separate wires for the ignition switch based on what position the key is at (accessories, glow, crank)?
I don't really want to confuse the issue with my prior summertime issues. That was no-response from the ignition switch. This is a definite response from the ignition switch in all three positions, just nothing from the glow plugs.
I may be finding that I have two issues that complement each other but are separate, independent processes. Is rewiring the ignition switch an invasive procedure? I can replace the switch itself (and maybe take apart the switch as a curiosity), but, if it's a problem with the wiring harness, I'd rather just get it over with. Intermittent problems really bug me
