The bow in the selector may not be allowing the finger contacts to make via the selector in full-auto. If you install it and move it between full and safe while carefully observing the contacts, this should be evident. The selector may also be making contact with the metal body, and if the tear is in the black (-) wire, then a short from - to + would occur via the mechbox and metal body. This would explain your previous over-current problem.
A fuse in your system would have revealed this fault, as it would have blown, or shown thermal damage at the very least. Mini-ATO fuses are very small, smaller than even a mini connector. Install one to protect the system, and to be a diagnostic aid as well.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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