Posts: 2754
Location: Mauston, Wisconsin | Uzi - I would not recommend putting your sonar on the trolling motor battery. I'm assuming your rig doesn't have a starting battery. If so I would get a smaller battery to run the sonar.
The problem with using the trolling motor battery is that your sonar may be sensitive to voltage drop or electrical interference. Voltage drop is one of those little electrical gremlin's that can drive you crazy.
f. ex. If you are fishing and hit full power on the TM, the sonar may shut off or lock up, and have to be reset. This would likely happen later in the day as the TM batteries are getting lower in available power.
There is also a very good chance of the TM causing electrical interference with your sonar. However, you could try it and see. If either happens, you need a separate battery for the sonar.
If you are going to try it, hook your sonar to battery number 2, the one with the negative lead running to the trolling motor.
Good luck,
Al
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