my one buddy has a cub cadet tractor that has a 3 cylinder diesel engine. [i can't see anything on any tags who made this engine]
the problem is the starter will not crank over. battery is good, and all wiring from the key to starter/glow plug relay checks good, plus all grounds, starter, and starter battery cables check out as well with no voltage drop.
attached, is a diagram showing the glow plug timer preheat module. it has 12v on the outer top row terminals in run and start.
the center terminal shows zero volts in run, but only 5.22v in the start position. if 12 volts is applied to the center terminal, which goes to the starter solenoid [almost identical to a mini-starter], the starter spins over as it should, and the engine starts.
is this module bad ?
the wire going to the glow plugs [from the relay] has 12v when key is turned on, and after xx seconds, the relay kicks, voltage to the plugs turns to zero, and the dash light for the plugs goes out [as it should ?].
i know nothing about diesel starting systems. TIA !