Technical > Spud Miller's Cave

How to ground your magneto with a standard two post master switch.

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ricci32:
Is there an easy way to ground your mag with a standard two post cut off switch.

Spud Miller:

 Hmm. Not sure what you mean exactly by a two post switch. Do you mean a regular make/break type of switch with two terminals?

 If so, then you'd just hook the + coil terminal to one post and the - terminal to the other. When they're connected, the mag is defeated/grounded. Of course, you'd need the negative terminal of the coil grounded to something good too.

 Lots of folks run the hot wire from the coil to the switch, but then just run the ground side of the switch to the chassis or something. The best ground is the other terminal of the coil. You have to run two wires to the coil instead of just one, but it really is the best way to go.

 If you're referring to a different type of switch, let me know and we'll figure it out!

 Spud

ricci32:
Let me explain I have a master cut off switch I wish to install at the rear of my front engine dragster which uses a standard battery and starter and has a internal coil joe hunt mag when the switch is in the off position the circuit is open and I need to ground the magneto how do I achieve this using that two terminal cut off switch. I still have a on off toggle switch to ground mag on the dash .

BK:
  Because a Mag makes its own power your only looking to ground it to the chassis to shut the engine down. Nothing from the main switch should go to ground. You might be able to do it with a relay.
  If your battery is up front you may want to consider moving your master switch up near the battery and controlling it from the back with a cable. That way you don't have a live cable going from front to back looking for a place to short out. It gives you a chance to put a lever in the cockpit to control the battery power. Also the control cable is probably lighter than your battery cable.

George:
I use the Flaming River Combination Magneto & Battery Kill Switch. http://www.flamingriver.com/index.php/products/c0015/s0002/FR1010                                                                                                                           
It is mounted to the rear of the Powerglide dipstick area and is operated from the rear of the car. It is indexed to  "Push Off".   A SPST toggle switch is in the drivers compartment. Its main function is to light the engine off.

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