I have 3 batteries to run a 36 volt trolling motor, my question is can i use these three same batteries and wire them in parallel to hook my 12 volt 1198c and 898c humminbird instead of just using one battery because they draw one battery down before a whole day of fishing and if i can use all three batteries i fink my trolling motor and fish finders will last a lot longer. Will this work????????
I don't see how you could use the 3 batteries in series for the trolling motor and in parallel for the Humminbirds while out fishing for a day. You would have to be constantly bolting and unbolting battery cables with a high likelihood of a mistake sometime.
You may be better off adding a deep-cycle house battery to your boat just to run the electronics. If you have a larger E-TEC outboard, you already have an isolator charging system that can be used to charge it separately. If no E-TEC, then you may want to investigate a Voltage Sensitive Relay (VSR) application.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.