No power after changing alternator

At the point where you state "my original alternator is a 3 prong, the one I installed is a 2 prong" - you just need to stop. You can't "tweak the prongs" and expect to "retrofit" your alternator! You may have done some serious damage to the charging system, electrical system, components throughout the vehicle or even the engine's processor. Stop, look for blown fuses, put a proper alternator in the vehicle, recheck and cross your fingers you don't have to go further.

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