This works great. Keeps starting battery charged, and when you use your dash radio it supplies the current for it, and other things dash related, and charges the battery up font. Plus when you put it up for winter just plug in. Your three stage converter will keep the house batteries charged and your starter battery. It is an AMP-L-Start. Wires up under the hood and connects back to your converter. Look it up online. I replaced my dash radio with a do-everything radio with satellite receiver. Never ran down the battery when plugged in.