my 72 has a big purple 10 gauge wire from the switch to the starter "S" terminal....i had a problem that it wouldn't start with the switch, so I cut the wire, and jumped it to the battery, and it cranked and started fine.......I found the starter bolts were just a little loose and a bunch of oil and crap was keeping it from getting a good ground. Evidently the bad ground in combination with the voltage drop across the switch was enough to keep it from doing anything.........
I cleaned up the starter, tightened the bolts, hooked the switch back up and haven't had a problem since.
BTW...this is after I fried a 15A push button switch that i hooked up until i had a chance to find the real problem
the moral of the story is.........bad grounds are a PITA
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option
00 Dodge 2500 4x4, 24V cummins, 5 speed
Chad
South Central Nebraska
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