These circuits are about as simple as starting circuits can get.
Check battery for static voltage. 12.5v +-.5v
Load test battery.
Clean and check connections:
Battery 12v+
Battery 12v-
Solenoid 12v+
Solenoid Switched 12v+ Signal
Solenoid 12v+ Load
Starter 12v+
Engine 12v-
If you check voltage and clean all these connections you should have an almost definitive solution to your problem.
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