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12-10-2017, 09:46 AM
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Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 829
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Ignition Switch and Mags
I have found that my O-360-A1A usually starts As soon as I release the starter switch. If I keep cranking it does not typically start. I have a standard Vans ignition keyed switch. Does this sound like a bad contact position in the switch?
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12-10-2017, 10:31 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by pa38112
Does this sound like a bad contact position in the switch?
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Is this a new installation, if so, sounds more like you have it wired wrong.
If this is something new on a plane that has been flying and starting normally, it could be a bad contact or something else in the wiring.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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12-10-2017, 10:46 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by Mike S
Is this a new installation, if so, sounds more like you have it wired wrong.
If this is something new on a plane that has been flying and starting normally, it could be a bad contact or something else in the wiring.
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Perhaps L and R mag wires swapped if there is only one impulse mag?
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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12-10-2017, 10:50 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,769
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It could also indicate a weak impulse mag. Normally the non-impulse mag is disabled in the start position. When you release the switch the non-impulse mag is on.
This is a pretty common indication of a weak mag. Been there, Done that, Got the t-shirt. Now I have 2 impulse mags. Turn both switches on, hit the start button, and go!
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Last edited by Mel : 12-10-2017 at 11:54 AM.
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12-10-2017, 11:16 AM
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Join Date: Mar 2006
Location: Edmond, OK
Posts: 194
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Had the same symptoms. Difficulty in starting became worse. Mag check was ok, when I could get it started. Checked fuel flow, spark plugs, mag timing, ignition switch, and mag grounding. Turned out to be a bad left mag. Overhaul shop tested it both hot and cold. Coil was bad and points were not set properly. I had the mag rebuilt and solved the starting problem. Mag only had about 310 hours.
Check all the easy stuff first before pulling the mag. Mag overhaul will cost $$$.
__________________
Dan Burdette
Skyview, ADS-B, Garmin 420W, TT Gemini AP
RV-9A, IO-320, E-Mag
Guthrie-Edmond Rgnl, OK (KGOK)
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12-10-2017, 11:36 AM
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Join Date: Jan 2005
Location: Charlottesville, Virginia
Posts: 1,230
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agree
Agree with Mel and Dan on this one. Happened to me too.
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Bob Martin
RV-6, 0-360 Hartzell C/S, Tip up, 1200+TT
James extended cowl/plenum, induction, -8VS and Rudder. TSFlightline hoses. Oregon Aero leather seats.
D100-KMD150-660-TT ADI2- AS air/oil seperator. Vetterman exhaust with turndown tips.
Louisa, Virginia KLKU N94TB
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