Is it ok to run both challenger engines off one battery?

[jagilbert]

My 95 Challenger has two batteries - one for each 657 Rotax engine.
The battery for the stb engine keeps draining and I suspect that maybe its Mag isn't charging.
There is a momentary switch to "bridge" the batteries.

Would it be OK to tie the batteries together in parallel or just run both engines off one battery?

Thanks,

 

[jhjesse]

Every Sea Doo boat I have been around have one battery for both engines. Some folks add a second battery for back up with the ability to switch batteries. I have never seen a boat setup with a battery for each engine. http://www.pbsboatstore.com/Guest-2100.htm?feed=Froogle&gclid=CM_3j9787b4CFQIT7AodCT8AOw
At any rate you need to figure out why your battery is draining. I would start by getting the battery tested at a local auto parts store.

 

[Cheap Engineer]

My 96 Speedster had two jet ski batteries. I removed them and installed a single Optima blue top. I had to cut the battery trays so that it would fit and modified the rubber tie down a little. I ran both postive wires to the postive post and both negative wires to the negative post. Ran this way for five years and then sold the boat. No problems.

 

[jagilbert]

Thanks, Glad to hear I'm not gonna fry something.

 

[jhjesse]

My 96 Speedster had two jet ski batteries. I removed them and installed a single Optima blue top. I had to cut the battery trays so that it would fit and modified the rubber tie down a little. I ran both postive wires to the postive post and both negative wires to the negative post. Ran this way for five years and then sold the boat. No problems.

Cool. Learn something new everyday. I still say you need to find out why your battery is discharging.