The original "transformer" in your trailer had output voltages of
12V and 19V, both AC. The
12V line was for the lights and the 19V line was for the fans. How they figured out that 19V AC would operate a 12 DC motor is more than I know, but it worked. All lights and fans will operate fine on
12V DC from the battery. Turn the switches to "BATTERY", connect the Intellipower unit to the positive and negative terminals of the battery along with the positive and negative lines to the fuse block. Plug the Intellipower unit into 120V AC. Anytime you are connected to 120V AC, the charger will keep the battery at the proper level of charge AND power the 12V systems in the trailer. As soon as you disconnect from 120V AC, the battery takes over. If you have the "WIZARD" feature with the Intellipower unit, the flashing green light will tell you if the system is being charged, fully charged and in use, or in "storage" mode. Be sure to ground the base of the Intellipower unit to the body of the trailer as the instructions state. These are great units. All you have to do is check the water level in the battery occasionally (unless you have a gel-cell battery) and keep the unit plugged in to 120V AC and you should have all the power you need. Darol