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This 2001 chevy impala would not
crank or it would crank and would
not stop cranking even with the key
taken out of the ignition.
The issue was a short to ground on the control circuit.
As a technician you'll encounter vehicles that were messed with before you by someone else perhaps, with less or no experience.
Do not let this catch you by surprise and handle it just like any other diagnosis. Knowing basic fundamentals can take you a long way and save you time, money and errors.
I try my best to do my diagnostics quickly and correctly. You'll see here how to troubleshoot a starter and its electrical circuits easily, without relying on a wiring diagram, a computer, a scope or scanner. Use these methods on multiple vehicles. All said and done this particular problem can take less than 10 minutes to diagnose and fix and can be done on the field saving you or your customer the high cost of a tow truck.