I am thinking of adding two electric scotties to my boat as I have the manual hand crankers right now. I have a '79 9.9 johnson elec start with a 6 amp alternator built into it. I also have a two position switch hooked to the batteries. ON/OFF, with one battery. My question is would I need to add another battery if I added the downriggers??? I see lots of guys that don't and seem to be fine but just curious if running the kicker would take care of keeping the battery topped up. I kinda think not as 6 amp is at WOT. I am thinking of adding the second battery and running everything but the main off of it?? All electronics and downriggers off of second battery with kicker wired to that battery...
Any advice would be great on this one!!!