Just for information....the starter spinning is a good sign, however keep in mind the situation is different when it's cranking the engine, in the following way: Unloaded, the starter motor draws a lot less current than when cranking the engine.
Assume the purple wire works. Once the bendix drive pulls in, the solenoid internals connect the battery wire to the starter motor, and the starter starts to draw, say 400 amps. if there is a bad connection in the battery-to-starter, or a weak battery, the poor connection cannot sustain 400 amps and the voltage to the starter drops to a low value. The lower voltage causes the solenoid to drop out, the voltage rises, and the cycle repeats. Again this most likely happens with a weak battery or poor battery connections. Several hundred amps will show a weak spot if it exists.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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