Ok great news but youíre at that famous moment
Youíve got to find the green crusties!
That solenoid wire that is not conducting correctly has high resistance or an open somewhere that is not telling the solenoid to energize.
Time to consider isolating the diagnostics on that one wire. Inspect all connections, look for green crusties, feel wire for hard non flexible areas chase it back all the way to the ign switch if you can. Your test light AKA the ďscope on a ropeĒ is a valuable tool. I have one. But it might be time to invest in a digital meter and donít make the mistake I made in not getting the model with clamp on DC AMPS. It would be a handy tool fir starting, charging diagnostic work.
Donít stop now. Congrats on getting somewhere but find the bad wire! Thatís youíre mission.
2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Carslile Actuator, Equal-i-zer, Dill TPMS. Campfire cook.