Re: 12v trolling motor on 24v?Yes or no
Yes, it would hurt the motor. As Silvertip said, it will run for a very short time on 24 volts. It may also result in a fire when you overload the wires. Here are a couple of ideas to try. Are the conections all clean? If not, clean them up. Do any of the crimps get hot? If so, re-do them. How long are the wires and how large? Check the recomendations. If the wire is too long or too small, that will result in a problem. Check the archives and someone should have some recomendations. Better yet, what are the manufacturers recomendations? Follow them. Finally, is the battery really a good battery? A shorted cell or a generally bad battery will result in poor performance. Fix the real problem. If the motor is really the issue (not bad, just too small), then sell it on Craigslist and get a more powerful motor.
TerryMSU