Will hooping battery charger up backwards on boat damage motor?

Yes, connecting a battery charger backwards on a boat can potentially damage the motor and other electrical components. Reverse polarity can lead to short circuits, blown fuses, or damage to sensitive electronics. It’s crucial to always connect the charger with the correct polarity to avoid these risks. If the charger has a built-in protection feature, it may prevent damage, but it’s best to check the manufacturer's guidelines.