Bill...may I suggest that you consider upgrading your battery charger to a modern 3 stage charger with an EQ feature.
Your charger is NOT rated for 1120 watts....that is the input wattage. It puts out 65 amps at 13.8 V which is a maximum of 897 watts. But that is unimportant. What is important is that it is a dumb charger that does not get maximum life from your batteries and does not take proper care of them 24x7.
In suggesting a new charger...you should (assuming wet cell batteries) get one that delivers 20-25% in AMPS what your deep cycle battery banks total amp hour rating is.
So...if you have 400amphours of batteries...you should be looking at around 80-100 amp hours of charger power in a SMART charger.
A smart charger will charge your half depleted battery bank (never take it below 50%) first at around 14.7V....then drop down to around 13.8 and finally maintain at 13.2-13.4V and less than 1% amperage indefinitely. The final step ...equalization is usually done at around 15.2V for short periods of time to "stir things up" and prevent sulfation. Some chargers do this automatically on a schedule...others require you to select it manually. Since RV's sit around so much unused...this is a BIG deal.
Suggest you look at the IOTA engineering converter/chargers ONLY with their SMART IQ 4 stage module. Their DLS90 would be ideal for a 400amphour bank like many have...and their DLS45/55 is ideal for a couple of 6V golf carts as found in a lot of smaller coaches. Both are available on Amazon.
I'd note that wet batteries cannot accept a bigger charge current than about 20% of their rated amphours. It does NO GOOD to oversize your charger. Won't hurt anything but your wallet!
May I also suggest you get an AC/CD CLAMP meter for around 60 bucks so that you can clamp your wires and know PRECISELY how much draw you are getting on your red battery wire when it is all shut off. And then trace where the draws are coming from. LIKE this: