[Farmall] Turning on the magneto switch on Farmall "H"

[Tim Savelle]

Ok.  Thanks for the info.  How difficult it is to install the diode (or how
easy would it be for me to install it wrong), and where can I get the
correct diode of the correct type and size?

On Thu, Mar 11, 2010 at 7:30 PM, DBigdog <DBigdog at columbus.rr.com> wrote:

> Tim,
>    Some 12 volt conversions require alternator speeds higher than normally
> seen in the older tractor engines to get the alternator charging unless
> they
> are manually excited..  The previous owner apparently set up the toggle
> switch to temporarily apply voltage to the alternator to excite it so it
> would start charging.  This is often done with a diode or small lamp bulb
> which will allow the alternator to start charging but not bleed back
> through
> the component to drain the battery when not running.  I have also seen this
> done with a pushbutton to prevent leaving the switch in the on position.
>    The switch actually has nothing to do with the magneto at all.  As long
> as you don't forget to switch it off after exciting the alternator you will
> be OK.  If it were me I'd replace it with a diode to eliminate the need for
> the switch altogether or at the minimum I'd replace it with a small
> momentary contact pushbutton.
>
> ----- Original Message -----
> From: Tim Savelle
> To: Farmall/IHC mailing list
> Sent: Thursday, March 11, 2010 7:03 PM
> Subject: [Farmall] Turning on the magneto switch on Farmall "H"
>
>
> One more question (for today, that is)....
>
> Ref: the switch on the side of the amp meter box beneath the steering
> wheel.  The guy I bought the tractor from told me to flip what he called
> the
> magneto toggle switch up and then immediately back down to start current
> flowing to the battery for recharging when the tractor is running.  It has
> a
> 12 volt system.  Does this sound correct, that you would flip the switch up
> and then back down?  Just out of curiosity, why is it necessary to do this?
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