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The alternator ground has nothing to do with the starter. It has probably helped resolve starter problems for you in the past, just because you were working in the area of the starter wires.
There should be a yellow wire with a female spade connector that connects to the solenoid at the back, towards the outside. Positive directly from the battery connects to the upper bolt-on terminal on the back of the solenoid. The lower bolt-on terminal supplies power to the starter motor when the solenoid is engergized. The starter is grounded to the engine by physical contact and the engine is grounded by a cable from the battery to the trans primary cover.
A couple of things happen when you turn the key. Power is sent though the yellow wire, this energizes the solenoid. This does two things, shoves the starter drive forward, which engages with the flywheel teeth and it sends power to the starter motor.
If I understand you correctly, you are bridging the two large terminals, which will send power to the starter and in your case it does spin.
When you turn the key to start, you hear a click. This is probably the solenoid shoving the starter drive forward, but it is not going far enough or hitting the contact hard enough to send the power to the starter. The contact could be burn pretty bad, the rod inside the solenoid may be hanging up, it's hard to say.
What you really need to try, is bridging from the top bolt-on terminal to the spade connector. This will send power dirctly to the solenoid, by passing the key, make sure it is out of gear.
This could be as simple as a bad connection at the spade connector or a voltage drop between the ignition switch and the spade connector. Sometimes a hammer tap or two helps. Solenoids should be available separately, although I've never bought one.
Good luck.
posted by 216.128.13...
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