I strongly recommend that anyone who thinks the "ammeter bypass" actually accomplishes anything should watch several of the youtube video's made by @72RoadRunnerGTX regarding the ammeter bypass. He explains why the bypass has practically no value and introduces new vulnerabilities to the electrical system, and he explains the likely reasons why this bypass originated (ie when and for what vehicles, which are not our cars).
I think he's made about 6 videos on this topic, covering this topic from every angle.
I haven't watched the video but the ammeter bypass can possibly help because 1. Ammeter's themselves have been known to burn up. When that happens you lose power to the dash. 2. Connections at the bulkhead commonly burn up also causing all power to everything to drop out. This is especially a problem when someone replaces a lower output alternator with a high amperage alternator. Practically every bulkhead I've seen in an older Mopar was burned/toasted to some degree