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It is sounding like the solenoid, but can't be totally sure. Could be the yellow wire circuit, Ign barrel, etc. But a sticky solenoid, and or dirty contacts inside would seem the likely issue.
So one thing you could do to try and test this is as follows. Undo the nut on the output side of the solenoid and remove the elec tab from the stud. This feed goes to the starter motor. So the starter is now disabled. It seems the starter is probably not the culprit - but no confirmation right now. But to put the solenoid to some more scrutiny you can do one of 2 things. Turn the Ign key to start multiple times. Can you hear the solenoid engaging - clunk. The starter won't fire - you have disconnected it.
If that is not definitive, jump the solenoid terminal with the battery feed on it to the appropriate yellow wire terminal. That will engage the solenoid - if it is able to engage. If it is sticking, there will be no clunk. You can do this test multiple times until you get a defintive answer as to what is going on.
Or, if you feel adventurous - just do as Bob suggests, and while you are in there, clean the inner terminals.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
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