Sounds like a problem in the ignition bypass circuit. Take a look at the
wiring at the starter and see if one is broken or disconnected. It runs
when you have the key in the start position it allows full power to the
coil and it will run. Could also be a burned out ballast resistor
element. The external version is a ceramic unit usually bolted to the
firewall and one wire will connect to the + side of the coil. It may
also have a resistance wire inline. It will be between the + side of the
coil and the ignition switch. It gets bypassed when you turn the key.
If you cannot find it inline you could make a new circuit by using an
external resistor and connecting it to a 12 volt switched source.
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