So, I found and fixed the problem. I've added this response to benefit others that might have a similar issue.
Using a volt/ohm meter, I saw that there was a partial short to ground. Traced that to a 10-wire plug under the hood that handles the generator remote start switch. Water had gotten inside, corroded and shorted the ground-to-remote-start circuit (couldn't add pics for some reason).
Cut out the plug and hard wired everything with waterproof heat shrink connectors.