Posted by Mark - IN. on April 26, 2014 at 23:41:58 from (50.121.20.98):
In Reply to: Starter Problem posted by Stephen Newell on April 26, 2014 at 13:55:18:
Gosh, its been a long time since I've dealt with a Chevy stater and solenoid. Decades.
If you take a 12 volt battery and a set of jumper cables, and go from the negative terminal of the battery to somewhere on the starter, like the nose that sticks out on the front cover, thats your ground. Then take the positive from the battery straight to Terminal C, the moter will run because you've completed the circuit by bypassing the solenoid completely, but without the solenoid, the bendix won't engage...which is ok for the first test. Now, if you move the positive cable from the C Terminal to the B Terminal, nothing will happen because the circuit has not been closed (completed) yet. If you then take a screw driver and touch from Terminal A to Terminal B, it will act like your ignition switch and complete the circuit through the solenoid that will A) momentarily connect the 12 volts from Terminal B to Terminal C to spin the starter, and B) will cause the plunger within the solenoid to pull inward, pivoting the spinning bendix outward into the flywheel, turning your engine over.
If the starter spins when you go directly to Terminal C with 12 volts, the starter is good. If it doesn't, the starter is bad. If the starter is good, but fails to spin when you connect 12 volts to Terminal B and short Terminal A to Terminal B as an ignition switch does, chances are that the solenoid is bad. However, it could be the movement of the bendix that is preventing the solenoid from engaging it. The shaft that the bendix rides on in the starter could have a burr on it, or inside the bendix that is preventing the solenoid from engaging it...but regardless, the starter motor should still spin because when you short from Terminal A to Terminal B as an ignition switch would do, that should still apply voltage internally within the solenoid to Terminal C, that should cause the starter to spin, regardless.
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