Connect a jumper wire (12-14 gauge) between the large battery terminal on the starter solenoid and the positive terminal (+) of the coil.
Connecting this jumper wire is the same as turning on the ignition switch and it will by-pass any problem that might exist in the "starting circuit", including the ignition switch itself.
If that alleviates the intermittent issue, then as the guys have said, you've got some wire to replace.
DON'T leave the jumper wire installed very long unless the engine is running or you'll pretty likely burn out the coil.
It's the same as leaving the ignition ON.
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-Jerry
'Lone Ranger'
1978 RANGER 30
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