Most newer vehicles have a smart alternator. What that means is the ECM controls the alternator as load demand for the vehicles main battery is needed or not, off or on. Therefore your trailer battery may never really get much of any recharging from vehicle alternator. I have a Redarc BC to...
They are out of stock on them also. Go Westy sells them in a complete kit form with digital thermostat. Sure Marine you have to buy the installation kit separate and it appears comes with a manual thermostat. Go West is out of stock on them also.
I have a redarc bcdc charger on my trailer. I have the smaller one 25 amp (I believe). I did not do a separate negative wire from my tow vehicle battery, just the positive. I did run it in 8 gauge wire as recommended from camper dealer prior to redarc install. BCDC charger in my opinion is a...