Fought this damn problem for over 6 years and I (think) that I may have stumbled onto the solution: Loose connections on that fuse holder in the dash. All power for everything in the dash, along with the solenoid and ignition power, goes through that fuse so if it's got bad connections...
I removed the holder, lubed the connections with electrolytic grease, and crimped them tight.
Jeff
Mysterious low voltage at engine(s)
Mysterious low voltage at engine(s)
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington