2 Battery System With a Perko Selector Switch

[Sjetter]

Hello Guys, new Yamaha boat owner here. I have a 2009 SX230 with a 2 battery system & Perko selector installed. I am an aircraft jet mechanic and it is killing me not having a service manual or wiring diagram to be able to determine how things really operate on this boat. I have called 5 different Yamaha boat dealers in Texas and received 5 relatively different answers.

Can anyone in tech land tell me if the motors have a charging system that are able to charge both batteries when they are running with the selector on "both" ?

Thanks

 

[David Analog]

Quote, (.....able to charge both batteries when they are running with the selector on "both" ?).

In the switch 'Both' position #1 post, #2 post, and the 'C' output post are all paralleled.
If the dual battery switch is wired correctly then 'Both' banks will get charged while the engine is running.
There is only one correct way to wire a conventional dual battery Perko switch.
Nothing battery-direct (the only exception would be the bilge pump/float switch if you moor the boat, which is rare).
Battery #1 to switch position #1. Battery #2 to switch position #2.
Starter feed, stators feed, helm buss, and all other electrical accessories to the 'C' output of the switch.
All grounds, to engine block, both batteries, etc., are common.

'Both' or 'All' selection when running.
Select one bank only, whether #1 or #2, when at rest, engines off, and using electrical accessories.
Select 'Off' when placed on the trailer, in the slip, or when AC shore charging with a dual bank charger.

 

[Sjetter]

Quote, (.....able to charge both batteries when they are running with the selector on "both" ?).

In the switch 'Both' position #1 post, #2 post, and the 'C' output post are all paralleled.
If the dual battery switch is wired correctly then 'Both' banks will get charged while the engine is running.
There is only one correct way to wire a conventional dual battery Perko switch.
Nothing battery-direct (the only exception would be the bilge pump/float switch if you moor the boat, which is rare).
Battery #1 to switch position #1. Battery #2 to switch position #2.
Starter feed, stators feed, helm buss, and all other electrical accessories to the 'C' output of the switch.
All grounds, to engine block, both batteries, etc., are common.

'Both' or 'All' selection when running.
Select one bank only, whether #1 or #2, when at rest, engines off, and using electrical accessories.
Select 'Off' when placed on the trailer, in the slip, or when AC shore charging with a dual bank charger.

Thanks, much appreciated!

 

[Ronnie]

Yeah, what David said. Actually, that is a much more technical answer than I would ever provide.

I had a similar setup in my old Yamaha (an 06 sx230ho). As I recall, the electrical system doesn't produce enough electricity to charge two batteries efficiently simultaneously. I was told by several people including my installer to alternate the use of the batteries (e.g. Battery 1 on the 1st and 3rd weekend of a month and battery 2 on the 2nd and 4th weekends) unless or until I installed a dual bank charger maintainer.

 

[Island Jay]

Cannot go wrong with a dual battery charger setup to keep things topped off.
(Just saying)

 

[Sjetter]

Cannot go wrong with a dual battery charger setup to keep things topped off.
(Just saying)

Understand. ....can you recommend a good one? Thanks

 

[Island Jay]

No problem.
I would suggest this XPS 2 bank 20 amp.
http://www.ebay.com/itm/161332883624
Charges, maintains, and can deal with the batteries if in parallel. Good amps to if you ever go with AGM.
For a direct sale it would be $90 + $15 for shipping.
Let me know if I can help more.
thanks!
Jason

 

[Sjetter]

No problem.
I would suggest this XPS 2 bank 20 amp.
http://www.ebay.com/itm/161332883624
Charges, maintains, and can deal with the batteries if in parallel. Good amps to if you ever go with AGM.
For a direct sale it would be $90 + $15 for shipping.
Let me know if I can help more.
thanks!
Jason

Will do.......thanks

 

[Trevor Shipman]

Probably a silly question but... If you switch the battery to "off" will the stereo loose all of its settings? How do you avoid this?

 

[Island Jay]

Get a stereo that has a memory or button battery in it to keep that info intact. I believe marine radios may have this built in since power can get cut frequently.

 

[David Analog]

Probably a silly question but... If you switch the battery to "off" will the stereo loose all of its settings? How do you avoid this?

With some radios where it impacts the clock and radio stations only and radio is rarely used it doesn't much matter. On other radios it impacts equalization and a host of other critical settings and those are important to not have to re-set every day. So if you want a complete safety shut-off with zero chance of a parasitic or memory drain, but you want to also maintain memory functions weekend to weekend, you can do this. Run a small 15 amp type fused bypass switch. Keep the memory engaged short term and shut it down over winter storage.

 

[Island Jay]

@davidanalog
I forgot you were over here, too.