GordonThree wrote:
Sometimes I'm tempted to beef-up the charge line running to my trailer, but that's next to pointless because of the computer controlled regulator.
Upgrading the charge line
(to say 10 or 8 gauge) would help SOME, but not a lot !
As you stated, any US vehicle built after about 2000 has a "smart" charging system that will cut back the charging voltage to 13.6-13.8. By the time that gets to your trailer batteries it will keep them from discharging further, assuming there are NO LOADS in the trailer.
The bottom line Joe is, it is not the amps at the alternator it is the volts
AT the trailer battery.