Re: Do I need a keyed ignition switch on M for 12 volt conversion?

Posted by Bob M on February 26, 2003 at 11:49:49 from (165.170.128.68):

In Reply to: Do I need a keyed ignition switch on M for 12 volt conversion? posted by Bob G on February 26, 2003 at 10:57:59:

Bob - You don't need a keyed ignition switch! However unless you have a self-exciting (the so-called "single wire") alternator, you will need to replace the existing ignition switch with a DPDT switch. You use one set of the DPDT switch contacts to send voltage to the alternator control terminal with the ignition "on", and the other set of switch contacts to ground the magneto when "off".

You could probably find a DPDT push-pull switch to replace existing ign switch, but it may be tough to find one. However a toggle type DPDT switch can be purchased at any Radio Shack for about $5.

Another option is to install a normally open oil pressure switch on the engine (one whose contacts CLOSE on sensing oil pressure) and use that to control the alternator. A little more complex, but lets you use the existing ignition switch.

Punch below for a diagram of the DPDT switch setup...

• alternator conversion w/magneto ignition

Follow Ups:

• Re: Re: Do I need a keyed ignition switch on M for 12 volt conversion? Bob G 11:16:02 02/27/03 (0)

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