Received last night. My trailer is 50 amps and uses the 555 series Parrallex 500 mode. I unplugged the old one which has 5 wires, 1 small black and 1 small white connected to the switch. Then 2 big red wires for plus and 1 big white wire for ground. This new one I brought came with 6 wires, the difference was that instead of red wires they were blue and came with 2 big white ground wires. So stay tuned for changes. Although it is also a 500 series charger/converter it is much smaller than the original and does not fit in the case screw holes so I had to modify it by making new screw holes for the mounting plates. I made sure the power was disconnected from the entire trailer and unhooked the battery. Pulled out the old ones, put in the new ones. Power turned on and I believe it works. My batteries now hold a charge. The only problem is that now the inverter/charger fan runs all the time. i know i work I just hope my batteries don't boil over. I'll update if there are any issues over the next few months so far so good. Nice that I don't have to connect the battery to the charger in the garage. By the way, I am constantly connected to shore power, and have been for 2 ½ years. Update: A year and a half later: still works great. The fan runs all the time, which is normal, it's not loud enough for us to hear. Batteries stay charged, never had a problem. Just make sure you take your time to install it properly.
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