To answer various questions:
The purpose of this board is to integrate various safety switches (seat, PTO, neutral positions) and either supply or deny 12 volts to a fuel shut off solenoid. There is a separate voltage regulator elsewhere.
Didn稚 know the low DC voltage (either 9VDC or 1.5VDC) of the ohm meter could damage the simple 3 legged transistors populating the board and designed to have 12VDC pass through them.
The theory of operating part of the shop manual says the circuit that痴 behaving sporadically (provides 12v for 1 second to a solenoid coil) does so by providing a path to ground for one second. Any ideas on what component to look for that would perform this task?
Possibly a simple R/C time constant (resistor capacitor) to trigger the control of the transistor driving the solenoid coil. as others have said- speculation without a schematic.
That board is burned pretty bad in places, probably been hot enough to separate and burn open some traces too...
