Thanks...I hit think you hit it on the head...according to Cannon, they have a 30a reset switch under the unit, therefore the guys that installed my units when I bought the boat only put in 15a fuses...I would think that would blow them every time.... the one still sounds rough though and it won't do an automatic raise that Cannon says is the result of bad grounding of the boat...BUT, why does the other work so well...more research (and more experience) is needed!