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07-30-2015, 01:48 PM
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Join Date: Jun 2013
Location: Lemoore
Posts: 187
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And this is why I use this form!! I would have never known about the mag needing to be off, or the fact that the switches have to be wired opposite. I decided to go with a double pol switch to manage this. Toggle switches with guards.
Thanks for all the help!
Wingnut
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08-11-2015, 06:03 PM
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Join Date: Jun 2013
Location: Lemoore
Posts: 187
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wire diagram
OK guys,
I have the switches in hand and I just want to run it by a couple eyes to make sure I'm wiring these up correctly. Keep in mind I am not an EE and have limited electrical experience, so I am looking for a QA. Reference the photo attached. Top is the traditional switch I have, and below is how I am thinking of wiring it. Note, the two mag switches are single POL. So what I did was run the power for the starter through the R Mag switch. Seeing as the mag only works when the switch is in the OFF position, this would kill two birds with one stone: switch in ON(DOWN) position = starter button is "hot" and R mag is off (grounded). After start I switch it UP (switch apparent OFF) which turns on the mag and prevents the starter from being used. Is there an issue with this thinking? Primarily making a dual use out of a single POL switch in this instance?
Finally, please check over the rest of the diagram. I figured I'll connect the two grounds for each mag together to the ground wire that I take off the original switch. The numbers are associated with the numbers on the keyed switch diagram.
Any QA is appreciated before I move forward! Thank you!!!
-Wingnut
PS: I am wanting to use a single pol vice double pol on the R mag switch simply because the switch I want to use is single pol only.

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08-11-2015, 07:17 PM
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Join Date: Mar 2013
Location: El Dorado Hills, CA
Posts: 696
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Buy a DPST switch. They are cheap. Your diagram has B+ going to the mag. You can isolate the starter and mag grounding with another pole (DPST)
__________________
Blain
R-22 sold.
RV-8 AW Cert 02-09-17
N82 Sierra Tango
Avatar courtesy of AircraftStickers.com!
Dues gladly paid thru Nov. 2020(my reminder ).
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08-11-2015, 07:26 PM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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Quote:
Originally Posted by Blain
Buy a DPST switch. They are cheap. Your diagram has B+ going to the mag. You can isolate the starter and mag grounding with another pole (DPST)
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I think that's what he's showing... black on one side, red on the other. It took me a minute or two to figure that out - otherwise the bigger problem would be the battery being grounded. 
__________________
Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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08-11-2015, 09:01 PM
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Join Date: Oct 2009
Location: Victoria, BC, Canada
Posts: 3,932
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Quote:
Originally Posted by WingnutWick
PS: I am wanting to use a single pol vice double pol on the R mag switch simply because the switch I want to use is single pol only.
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You can't. In your circuit, if you use a single pole switch for the Right mag, when you turn the mag on you will short the Battery to Ground. That'll melt the wiring right out of the cockpit.
You have to have a double pole switch for the Right mag switch. Red circuit as you drew it on one side, black circuit as you drew it on the other.
__________________
Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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08-11-2015, 09:17 PM
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Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,251
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Quote:
Originally Posted by Canadian_JOY
Some suggestions...
One other big note here. With a magneto, the engine runs when the P-lead circuit is not grounded. In terms of "switch-ology" this means the switch is open circuit "open" to make the engine run. We close the switch contacts to connect ground to the P-lead. This means we have to install the switch upside down in the panel. Keep in mind the normal orientation of a switch is "up = on = closed circuit"... in this case we want "up = engine run = OPEN circuit". This means we have to drill the small hole for the anti-rotation tab opposite the normal orientation for our ignition switches.
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Or just use SPDT switches and use the opposite terminal.
__________________
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V e r n. ====
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RV-9A complete
Harmon Rocket complete
S-21 wings complete
Victoria, BC (Summer)
Chandler, Az (Winter)
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08-11-2015, 10:38 PM
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Join Date: Jun 2013
Location: Lemoore
Posts: 187
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I see what you're saying though (purely for my own understanding) I think you mean when the switch is ON, to mean the R MAG is off, then the batt would be connected to the ground. Looks like I am stuck with the double pole or the SPDT method. Thanks a bunch for the help and please pardon my lack of electrical expertise.
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08-11-2015, 11:55 PM
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Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,251
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Quote:
Originally Posted by WingnutWick
I see what you're saying though (purely for my own understanding) I think you mean when the switch is ON, to mean the R MAG is off, then the batt would be connected to the ground. Looks like I am stuck with the double pole or the SPDT method. Thanks a bunch for the help and please pardon my lack of electrical expertise.
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This is all covered in detail on Bob Nuckoll's Aeroelectric.com web site. Here is just one example... The site has many more... http://www.aeroelectric.com/PPS/Adob..._Pdfs/Z11N.pdf
__________________
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V e r n. ====
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RV-9A complete
Harmon Rocket complete
S-21 wings complete
Victoria, BC (Summer)
Chandler, Az (Winter)
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08-12-2015, 06:39 AM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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I put my simple B&C pushbutton switch way over on the left of the instrument panel and up high, allowing me to use the right hand on the throttle. There's NO way you can accidentally brush up against the switch in that configuration (and if you could, why is your master on in the first place?)
The two toggle switches -- on to ground for the mag, and one to the CB for the Lightspeed -- are grouped together AWAY FROM ALL OTHER TOGGLES .
A lovely, and simple configuration and solution that costs about $25 tops.
I'm not the smartest guy in the world, but I'm glad I did it this way. ( More info)

Last edited by LettersFromFlyoverCountry : 08-12-2015 at 06:41 AM.
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08-12-2015, 07:19 AM
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Join Date: Oct 2009
Location: Victoria, BC, Canada
Posts: 3,932
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Quote:
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Originally Posted by Canadian_Joy
This means we have to drill the small hole for the anti-rotation tab opposite the normal orientation for our ignition switches.
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Is it just me or do others just snip the anti-rotation tab off their switches as well? I don't find my switches rotating after installation. I have a socket that fits over the locking nut on the switch, that was ground flush so it would grab all the way into position flush against the panel. With that, i've always been able to lock the switch in place so it wouldn't turn.
I think the bodies are too close together behind the panel to allow one to turn more than 20 degrees or so... So I wouldn't lose any indication of which way the switch is turned, even if it did come loose.
__________________
Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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