Ammeter Maxed

First off, you need a real alternator that can generate the necessary amps to run your fans. The crappy mopar alternators aren’t capable of doing this properly. Even the high amp ones don’t supply clean, ample current at idle.
Once you install a proper unit, add a good size charge cable to go from the alternator to the starter relay. This creates a path of less resistance for current to travel. Doing this eliminates the need to hack out your ammeter.
Depending on your engine the Nippondenso or GM cs130s are good choices.