Ranger does not run a dedicated 6 gauge wire to the front. It's a 12 gauge wire as depicted on schematic posted by grhodes674. I would suggest you have a loose connection on your console unit. I would also suggest you remove your bow panel and examine the wires to the terminal strip. If you have the 12 gauge wires as shown on schematic, you have issues. The Ranger OEM 12 gauge wires are sized for 1 bow unit, grossly undersize for 2 units. Garmin requires 8 Gauge wire on 20 ft. run.
You are 100 % wrong I just got done rigging a 2021 521L for a tour pro and it is already wired with 6 gauge wire as a matter a fact it is in the picture on post 10 and that is run on it's own 30 amp breaker.