P-Mag switches - Page 2

Ken · #11 09-20-2009, 07:16 PM

Mike,

The wiring diagrams are at the back of the Installation and Operating Guide. I just checked the current download and it is page 24.

You need the p-lead(kill switch) and you need a switch to test the internal alternator.

As I mentioned in the earlier post I used a push button but you can use a toggle switch or a breaker.

Ken

RV7Guy · #12 09-20-2009, 07:35 PM

Wire per the instructions. I used two switched breakers and the on/off/both mag start switch. Ground wires to engine block. Avoid any in-line connectors.

They are simple to wire. Keep it that way.

RVG8tor · #13 09-20-2009, 07:37 PM

Quote:

Originally Posted by Ken

Mike,

The wiring diagrams are at the back of the Installation and Operating Guide. I just checked the current download and it is page 24.

You need the p-lead(kill switch) and you need a switch to test the internal alternator.

As I mentioned in the earlier post I used a push button but you can use a toggle switch or a breaker.

Ken

Ken,

Sorry I thought you were using a different type of switch, the 4 in "4 SPST" had me confused which is easy to do. What you have is your basic on/off swatch for the mag check.

With respect to the other switch (push button) when I talked to Brad the other day he agreed that the 12V power check was not needed every flight, hence my thought to use the CB (pulling) to make the check rather than installing a switch, be that toggle or push button. What are your feelings on this setup and frequency of this check?

Ken · #14 09-20-2009, 08:14 PM

Mike,

I used the push button because it fit better into my wiring and panel. Also can't leave it off inadvertently. See no problem using the breaker as a switch.

Ken

RVG8tor · #15 09-21-2009, 09:59 AM

Do you guys flying with P-Mags do the 12v power check each flight (low rps)? Brad seemed to agree this was not needed each flight. It occurred to me that what would be nice to know is when the P-Mag is using ships power, my vision is a P-Mag annunciator light that would come on this telling you that the mag is no longer generating internal power. Even if you had a good check on the ground, wouldn't it be nice to know it stopped working in flight. I no electrical whiz but maybe there is an easy way to hook up a light to do this. Continuity of the lights would be checked on the ground since at low RPM the internal alternator is not producing power, these lights would come on and off as you taxi out, if the blinking lights are a problem, "on the ground" switch could be wired in to inhibit the lights while on the ground. Hmmm any electro smart guys know how to do this?

Steve Sampson · #16 09-21-2009, 10:18 AM

I did it like this. It has worked well for me. It reduces the number of switches to two in total and is ergonomically simple.

I don't test the self generation every flight, but when the mood takes me. Similarly the low running speed.

RVG8tor · #17 09-21-2009, 10:39 AM

Thanks, that is a great write up with illustrations even. I can't tell you how much it helps to see pictures with the words. Your system seems very clean and simple. I like the reduced switch count. I was thinking along the same lines, but I was going to use a switch to control the p-lead and just pull the CB to do the check that your momentary switch position does. I kind of like your set up, it just means more wire.

Steve Sampson · #18 09-22-2009, 01:30 AM

Quote:

Originally Posted by RVG8tor

T........ I kind of like your set up, it just means more wire.

I cant see it means more wire, in fact less surely. Also less joints to fail.

loopfuzz · #19 09-22-2009, 11:30 AM

Quote:

Originally Posted by RVG8tor

my vision is a P-Mag annunciator light that would come on this telling you that the mag is no longer generating internal power.

Good idea Mike. I haven't started wiring the p-mag up yet. But when I do, I'm going to look into doing something like this.

Chris.

MCA · #20 09-22-2009, 12:31 PM

Quote:

Originally Posted by RVG8tor

With respect to the other switch (push button) when I talked to Brad the other day he agreed that the 12V power check was not needed every flight, hence my thought to use the CB (pulling) to make the check rather than installing a switch, be that toggle or push button. What are your feelings on this setup and frequency of this check?

Hard to say the frequency. I check it "randomly" but not every every flight. Checks are more thorough before a x-country than a local flight.

Would not recommend using the CB as a switch, that's not what it is designed for.