Turning on my Lowrance LCX 111HD fish locator...

Question

I have moved my antenna to the opposite side of my boat from the Fish finder. I ran a dedicated power feed to the radio as it had been showing low battery. I have two different Lowrance fish finders. Both transducer cables run on the same side of the 16ft aluminum boat along with the power feed for the Lowrqnce LCX-15mt locator/GPS. The power feed for the LCX 111HR fish finder/GPS run down the other side of the boat. When I turn on the LCX 111 the marine radio picks up a lot of static.With the LCX 111 on and I turn squelch out the static and then turn on the heater fan the static appears on the radio. When I turn off the LCX 111 and turn on the LCX 15mt it does not pick up static. If I then turn on the heater fan there is no static. If I pull off the tranducer cable intended for the L 111 and connect the transducer for the LCX 15 to the LCX 111 there is still static. Knowing that the power feed for the radio and the LCX 111 are running along beside each other I unhooked the power cord at the radio and supplied power to it by an independet jump start battery near the radio. When I turn on the radio and reduce the squelch to a normal position and then turn on the LCX 111 the radio again picks up the static. Do you have aby suggestions for me to try to reduce the static as I would prefer to use the LCX 111HD locator/gps. I originally had the LCX 15mt on the right side of the boat with the marine radion antenna mounted on that side about three feet away and the radio mounteds on the left side of the boat and didn't have a problem. The LCX 111HD is a much larger unit. Thanks, Leon