Posted 6/19/2012 10:54 PM (#566385)
Subject: batteries

Posts: 39

hey guys I just wanted to pick your brains.
I might need a new set of batteries but here goes. I have a terrova 80pound. I use my trolling motor for about 2 hours and then it goes down from 4 bars to 3. i put a voltage meter on the 2 batteries and it says 24.9 or 25.3 (moves). I notice that the power goes way down and then 10 min later it could read 4 bars and have tons of power.
do you think i need a new set of batteries? one is a year old and other is new. they are different batteries.
also i was looking at the DC31DT batteries. what do you guys think of these?
ESOX Maniac
Posted 6/20/2012 5:54 AM (#566396 - in reply to #566385)
Subject: RE: batteries

Posts: 2743

Location: Mauston, Wisconsin
It sounds like you have a connection problem or one of the batteries has a cracked inter-cell weld. That can happen because of vibration from running in rough water or the weld was faulty from the factory.

FIRST: Carefully check each connection, starting from the batteries moving toward the trolling motor. A simple visual inspection is not good enough. Take off the battery/cable connections and make sure there is absolutely no corrosion, then reattach and tighten them properly as you go forward. Be sure to leave one of the battery connection's disconnected, preferably one of the ends of the jumper that connects the two batteries together.

Check the connector pins, both on the receptacle and on the plug. Then take off the TM cover, and check the connections there w/ TM unplugged.

If its a intercell weld problem you may only need one battery. The way to find the bad battery is to check each battery's voltage when its under load, i.e., when the TM is acting up. Obviously its hard to do w/o a partner. The bad battery's voltage reading will be much lower than the other good battery.

How old are the batteries? If you have access to a good battery. You could also replace them one at a time w/ the spare - known good battery.

Good luck.