Battery Switch - SailNet Community
LinkBack Thread Tools
post #1 of 5 Old 03-31-2003
Posts: n/a
Battery Switch

So after reading most of the discussion threads on batteries on this site, I still don''t quite understand how the whole 1-2-Both-Off Battery switch works. I have a 12V Starting Battery (#1), and 2 6V Batteries in series for my House bank (#2). I also have a dual output alternator. Now...if I set the battery switch to "1" before cranking the engine, does that mean my House Bank is off and I''m only using my starting battery? So am I then (after engine successfully started) supposed to put the switch on "2" so that my Starting Battery is off and isolated from the House bank which is now powering all my electronics? And then, given the dual output alternator, should I have the switch set to both when the engine is running so both are charging, or do both batteries always charge with the dual output alternator regardless of the switch setting. Am I making this harder than it needs to be?

I hope my rambling questions makes some sense, and I would really appreciate any help with this. Thanks.
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 5 Old 03-31-2003
Senior Member
Join Date: Oct 2000
Posts: 629
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 17
Battery Switch

I believe the correct answers are
fair winds,
kimberlite is offline  
Quote Quick Reply Share with Facebook
post #3 of 5 Old 04-01-2003
Junior Member
Join Date: Dec 2002
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Battery Switch

Have just got a new to me outboard with a charging system on it but no starter how should I wire it into my battery system? I want to be able to charge both batteries at different times I have a Perko 9603 Series with Alternator Field Disconnect. Two Battery Switch 1-2-Both. I am running 2 12 volt batteries for my system. What posts do I connect the output from the motor to on the Perko switch
Thanks for any help
Scott Johnson
> C&C 25 MK2
> Cole Sere
skyamsen is offline  
Quote Quick Reply Share with Facebook
post #4 of 5 Old 04-01-2003
Join Date: Nov 2002
Posts: 84
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 15
Battery Switch

To the original question. I think "eric" is right but here is a suggestion. Take a pad and pencil and sketch what you can see. I think you will find three red cables off of the back of the Battery Switch.

One should go to the starter or thereabouts. That post should also have a wire to the DC bus behind the panel. This is the 12V for your boat''s electronics, pumps, and lights.

Another red cable should go from the back of the switch to your starter battery. The third red cable to one of the 6V house batteries. So in switch pos. #1 there is only 12V from the starter battery to the starter(and everything else). In pos. #2 there is 12V from the house batteries to the starter and everything else.

Now draw the wiring from the alternator. If you find two wires can you trace them? On a single-wire alternator the one wire goes to the starter since the wire to the battery switch is already there. But with a 2-wire alternator you probably have a wire directly to each battery bank. If so then the battery switch position does not matter, if the engine is running then both banks are being charged.
h37skipper is offline  
Quote Quick Reply Share with Facebook
post #5 of 5 Old 04-08-2003
fer@fer's Avatar
Join Date: Mar 2000
Posts: 98
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 18
Battery Switch

You need first to understand how the wiring of the batteries and the switch was made.

The fact is you know to start your engine, know how to sail your boat, and you do not understand how your battery switch works.

Same happened to me.

If I were to ask a crew mate to switch one, two or both batteries, he would probably need to read a manual to understand what he was doing. This is the main reason why I swiched from a 1,2,both switch, to two tiny and ridiculous non good looking on-off switches. I get another on-off switch to paralel both banks.

I do also have alternator supplying current directly to the bank, bypassing the on-off switch.
fer@fer is offline  
Quote Quick Reply Share with Facebook

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Solar Power for Battery Charge KnotaClew23 Gear & Maintenance 1 09-23-2005 03:40 PM
battery isolator with starter/generator? owenmccall Gear & Maintenance 1 07-21-2004 07:58 AM
Battery combiner vs battery isolator prelude General Discussion (sailing related) 2 07-09-2003 08:31 AM
Blown Balmar? z1nonlyone General Discussion (sailing related) 3 01-30-2003 12:25 AM
Wiring set-up for battery switch. pehrst Gear & Maintenance 6 06-18-2002 05:51 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome