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The Studes, (and many other cars) had stepdown resistors in line with the coil that knocked the voltage down to 6 V for normal running. The starter switch had a 12V line to the coil that was only hot while the starter was cranking, and when the key returned to normal, the circuit using the resistor was hot. The symptoms if the resistor was burned out was that it would run as long as the starter was engaged, but then die in Normal. The resistor is usually mounted on the firewall behind the distributor, and is a 4 in ceramic piece. (at least on the 59 and older).
Hope this helps.
Jack
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Jack
'70 914/6
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