Dead Battery after 60 minutes

[ckleiman]

Any thoughts on why my battery dies after about 60 minutes on the water. Suppose the battery is totally fine (took to auto shop and tested multiple times). Also, suppose there are no major accessory draws on the battery. Why would my battery go from full charge to zero charge after 60 minutes of running. I did however, turn the ignition on/off probably a dozen times. What is the system on the 240EFI that charges the battery while the boat is running? I understand there is no alternator on this boat. Thanks all!

 

[Tim75]

Any thoughts on why my battery dies after about 60 minutes on the water. Suppose the battery is totally fine (took to auto shop and tested multiple times). Also, suppose there are no major accessory draws on the battery. Why would my battery go from full charge to zero charge after 60 minutes of running. I did however, turn the ignition on/off probably a dozen times. What is the system on the 240EFI that charges the battery while the boat is running? I understand there is no alternator on this boat. Thanks all!

Since you said the engine does not have an alternator, I surmise you have a Gen 1 engine.

It DOES have an alt. just not like a car. It basically 4 parts- stator (under the flywheel), flywheel magnets, wires, voltage regulators.

Your regs may be toasted. If your battery has an internal short. it can toast the regs.

 

[Dr Honda]

Yep... what he said. You probably have bad regulators... and it's actually draining your battery.

The gen 1 240efi has two 20A output stator sections. You can split them off to 2 batteries... but from the factory, they are tied together to give you a 40a system. It's pretty simple.

1) Check the fuses. Probably not the issue since it's draining.
2) disconnected the regulators, and use a meter to check the stator. If it's good...
3) Replace both regulators.

 

[ckleiman]

Since you said the engine does not have an alternator, I surmise you have a Gen 1 engine.

It DOES have an alt. just not like a car. It basically 4 parts- stator (under the flywheel), flywheel magnets, wires, voltage regulators.

Your regs may be toasted. If your battery has an internal short. it can toast the regs.

Thank you!!!

 

[ckleiman]

Since you said the engine does not have an alternator, I surmise you have a Gen 1 engine.

It DOES have an alt. just not like a car. It basically 4 parts- stator (under the flywheel), flywheel magnets, wires, voltage regulators.

Your regs may be toasted. If your battery has an internal short. it can toast the regs.

Thank you!!!

 

[ckleiman]

Yep... what he said. You probably have bad regulators... and it's actually draining your battery.

The gen 1 240efi has two 20A output stator sections. You can split them off to 2 batteries... but from the factory, they are tied together to give you a 40a system. It's pretty simple.

1) Check the fuses. Probably not the issue since it's draining.
2) disconnected the regulators, and use a meter to check the stator. If it's good...
3) Replace both regulators.

Dr Honda, thank you again! Can you elaborate a little bit more on which wires to use when testing with a meter?

 

[Dr Honda]

The wires that go back up into the stator. As I recall... it should be the yellow wires. Make sure they aren't shorted or open.

 

[nenikol23]

@ckleiman Were you able to solve your battery draining issue? If so, What was it?

 

[ckleiman]

@ckleiman Were you able to solve your battery draining issue? If so, What was it?

Still working on it actually. In the middle of trying to get the flywheel off so I can test the stator.

 

[Tim75]

Still working on it actually. In the middle of trying to get the flywheel off so I can test the stator.

Don't need to remove. Testing is done by the wires coming from the stator.

 

[ckleiman]

Don't need to remove. Testing is done by the wires coming from the stator.

Thanks Tim!!!! Shows you how much I know!