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Author Topic:   Dual batteries - what is the correct setup?
newt posted 07-26-2002 04:58 PM ET (US)   Profile for newt   Send Email to newt  
I have been reading past posts on batteries, and now question if mine are set up correctly.

I have two batteries with a 1,2,both,off switch. The engine is wired to the selector switch, while everything else (lights, electronics,etc) is wired directly to one of the batteries. So, to start the engine, I can use #1, #2 or both, but the house loads are either off of Bat #1, or both (if the switch is set to both.

Is this a prudent setup? Or should the house loads be wired to the selector switch also?

DJS posted 07-27-2002 02:24 PM ET (US)     Profile for DJS  Send Email to DJS     

Try this:

Hope this helps

jimh posted 07-28-2002 08:59 AM ET (US)     Profile for jimh  Send Email to jimh     
There is no "correct" setup. There are many ways to interconnect all these batteries and loads.

The situation you describe is a bit unusual. Generally if the "Master" switch is OFF, you'd expect everything to be disconnected from the battery. In your case it sounds like just the engines are disconnected.

It is fairly typical that some circuits bypass the master switch and go directly to a battery. A bilge pump is on example. To have everything connected directly to the battery is unusual.

newt posted 07-29-2002 08:37 AM ET (US)     Profile for newt  Send Email to newt     
Great reference article, I dont know why I didnt see it before. My setup is slightly different from the article recomended, but not much.

Thanks for the responses

JimU posted 07-29-2002 09:54 AM ET (US)     Profile for JimU  Send Email to JimU     
If your switch is a Blue Sea product, go to their web site
where2 posted 07-29-2002 01:16 PM ET (US)     Profile for where2  Send Email to where2     
I always like to keep the lights wired to the battery switch rather than straight for the simple fact that it's easy to forget to turn the lights off, but if you are in the habit of turning off the battery switch it turns the lights off and saves the battery. Same goes for the electronics. If you turn the VHF volume down (so your deck hands can hear your comments as you approach the dock), but not off, the battery switch takes care of turning off the VHF.

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