[Alloyvert]

Thanks all.

Confirmed that prior and with the drivers side harness unplugged at the firewall there is no drain as well. But in good news, think I figured it out. Shortly after typing up the original post, it hit me that I totally forgot about the passenger side harness. So I unplugged that harness at the firewall and what do you know, the test light was not lit. Next up was reconnecting and checking the coil and temp gauge sensor... neither extinguished the test light. That only leaves the starter solenoid, which I am confident is the culprit. The starter works fine, but assume a partial short in the solenoid is still possible.

The heat wave is rolling through now, so I will confirm it later along with picking up a replacement while in town tomorrow. It will be nice to put this issue to bed as there are plenty of other areas to attack with the leaking radiator up next, followed by getting a bed installed so this truck can get put to use.