Are you talking about the step on button that pushes and connects solenoid on starter Not the button you put your foot on, the button on the top of the starter that the other end of that linkage presses on. You didn't say what year your truck is, but if it is 6 volt it didn't come with a solenoid.
'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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