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There are several possibilities, it could be the solenoid, starter, ignition switch, ground connections, or wiring. The first thing to understand is that the cold start valve is powered every time you turn the key to start and fuel is spraying into the engine flooding it. The thermotime switch is not quick enough to shut it off in multiple attempts to solve the starter issue, so remove the fuel pump relay until you get it cranking. The first thing I do is disconnect the battery ground, charge to battery and check the voltage. Clean the ground strap to the engine while it is charging, clean the battery ground and hook up a voltmeter to the small yellow wire at terminal 50 on the starter. When the battery is above 12.6 standing volts, make all the connections, turn the key to start and determine if you are getting 12 volts at the starter. If so, the ignition switch and wiring is OK. If the starter is still not cranking, try running a heavy jumper cable directly from the ground terminal to the engine. The starter must come out next, you can try cleaning and lubing the solenoid. There is a fault in the ground wiring on the Bosch starter which is never touched in a rebuild and unfortunately you can get a rebuild that does the same thing after a year or so. The new rebuilds have solenoids that are made in Mexico and cannot be serviced.
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Paul
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