Technical > Spud Miller's Cave

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

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H.G. Wells:

--- Quote from: Spud Miller on January 19, 2014, 08:39:23 AM ---
 The bummer about the flaming River switch, is that you have to run your primary mag hot wire the length of the car. Not a very good deal. Over time, the chances of it getting rubbed raw and leaving your mag dead are too great in my opinion.

 Using a relay is what I suggest. When you cut the power to the car, the relay relaxes and grounds the mag.

 Just be sure to use one that is impervious to vibration and can handle the voltage and current. We offer this one:
 http://fuelinjectionent.com/webstore/product_info.php?products_id=350

 It's really two separate relays in one unit. You can double up and use both sides together to double it's capacity, leave the other side for a spare, or kill two mags with it.

 Spud

--- End quote ---


I wish I had pics, but I mounted my flaming river relay under the cowl and the master disconnect where the stock fuel pump would have gone.  Ran a morse cable from the chute pack to the master.  Very little wiring that way.

Geri:
let me add a little to this, I have two mag switches on my car-  (blown fuel) one for the driver and one mounted in front of the engine next to the fuel shutoff, in case I need to shut it down I can turn off the mag from either location.   as long as both switches are open, the magneto will run, with either mag switchs grounded it will shut off the engine. this for me is a safety issue. the switch only requires one wire to the mag the other to chassis ground. a normally on toggle switch  will kill the magneto as it completes the circuit to ground. that only means what appears to be off is actually run position for a toggle switch.
I have never bought the notion that shutting off an engine with the mag switch will blow up the engine or lift the blower- you cannot take the flame source away from the potential and cause a flame. others are free to believe what they may,I have used the mag switch to shut down the engine for as long as I  can remember (after first turning off the fuel)

ricci32:
thanks im going to install a master cut off switch at the rear of the car I also use a marine push pull switch in the cockpit to ground the mag the relay that spud sells will allow me to kill the  fuelpump ,mag from the master at the rear of the car . this is on my nostalgia fed.
 

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