'57 with a stomp starter. The stomp switch has a terminal on the side that is wired directly to coil +. That provides 12volts directly to the coil when the stomp occurs. Once you let off the stomp (and assuming they key is on) 12volts from the ignition switch passes through a "ballast resistor" (usually mounted on the engine side of the firewall and on to coil +.
With the key on and the engine not running you should see the following at coil +.
12 volts if the points are open.
Somewhere around 8 volts if the points are closed.
By the way, your engine is capable of starting with the key off, but should die as soon as you get off the stomper.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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