When your boat's engine won't turn over you may need to jump start the boat battery. Jump starting a boat battery is actually much easier than you might imagine and is very similar to jump starting your car.
Step 1 - Check the Battery
If you are having trouble with your boat starting, you may think of the battery as being the culprit. First, check that there isn't anything which could stop the battery from working properly. Check that nothing is blocking the connections, and that all of the wires are intact and in good condition.
Step 2 - Safety Check
Before you jump start your boat you need to make sure that every single electrical appliance on your boat is switched off.
Turn off all of these electrical appliances so that nothing is using the battery.
To jump start your boat you can either use a car battery or another boat.
Step 3 - Jump Starting
Connect the terminals of the boat battery and jump battery together, but make sure you connect positive to positive and negative to negative.
Wait a few minutes to allow the battery to get some charge again. Turn the key in your boat as normal and the engine should start. Disconnect the leads and the battery should charge up as normal.