New solenoid - no click, new batteries, new tow/run switch

[b_zazzi]

Have old cart, G22, that sat for a few years but ran when parked in garage. Replaced batteries last week and thought I heard solenoid click when first turned tow/run to run. But when tried to run cart, nothing happened - no run, no buzzer when in reverse, and no more clicks on solenoid. Tried to clean contacts on tow run switch which promptly broke due to heavy corrosion. Replaced switch, also replaced solenoid. Still no click. Checked 3 amp fuse and replaced. Getting voltage to top/ big posts on solenoid (about 55 V). But have no voltage but also very little resistance (0.1 ohms +/-) on bottom terminals with “gas pedal” depressed. Could I have corrosion on gas pedal switch? But what about the buzzer? Any troubleshooting guidance would be greatly appreciated. I hate to be the millionth person asking the same question, but I am at a loss. Am I looking at new controller or can I still test something - I.e. I saw a relay in the wiring diagram for g19. Is there another switch somewhere on g22?