I thought I could figure out DC automotive electrics Kenneth, but this one has me baffled.

What is the purpose of the normally open contacts that connect the points side of the coil ( #18 Red-White stripe) to a set of normally open contacts of the overdrive solenoid ( #18 Blue-Orange stripe)? Looks to me like it would short points to ground when the overdrive solenoid was activated and the kickdown switch was pressed, causing the engine to stall momentarily .
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'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.