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Date: Mon, 07 Jan 2008 15:51:15 -0500
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Subject: Re: [LML] Battery tender
References: <list-2633920@logan.com> <op.t4kpp1xaoo3lez@john-study-2> <op.t4kp7iemoo3lez@john-study-2>
From: "John Schroeder" <jschroeder@perigee.net>
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Jim -

Do you happen to have a schematic of the main power circuitry of your system? If you do and could email me a copy, I can take a look at it.

Something like Marv did in his posting would work, if you wired the feed lines directly to your batteries. As i understand his fix, he did it this way and uses the timer and relay to switch the output from the tender to each battery on a four-hour-per-battery cycle. It is a little complex, but very elegant.

We have one tender and two jacks. We manually switch the plug to the jack of the battery we want  "tended" Usually, it is to the #1 battery (bobatteries are 20 AH batteries) because it is the one we use to start the engine.

John


On Mon, 07 Jan 2008 00:29:54 -0500, Jim Scales <joscales98@hotmail.com> wrote:

> I want to install wiring to my batteries so that a Battery Tender can keep them topped and ready during cold weather.
>
> I have a dual battery 12-volt system with the batteries charged by one alternator through an isolator.  There is a master toggle that allows me to choose one or the other to be the battery used by the plane at any particular time.  The system works very well.
>
> I want to be able to keep both batteries topped without having to change the tender from one to the other.
>
> It would seem that hooking the tender to the center pole (alternator input post) of the isolator along with the common ground would accomplish this purpose.  However, I do not pretend to have even a rudimentary understanding of the electrical system, so I would like some input from the list members as to what would be the proper wiring plan.
>
> Thanks,
>
> Jim Scales
>