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Old 05-12-2013, 06:16 PM
albertaflyer albertaflyer is offline
Join Date: Oct 2010
Location: Red Deer, Alberta
Posts: 71
Default Right slick mag problem


Just got back from a flight and before shutdown I check the mags. Anyways, when I switched to the right mag the engine was going to quit. It did this to me about 2 months ago. At that time I pulled the mag and had it checked. Everything was good. Checked the wiring and the ACS mag switch and it was fine. Put it back together and it was fine until... Fast forward to today. Pulled the ACS switch out and cleaned the contacts, but to no avail. Any ideas? When I did my run up before the flight, the left mag dropped about 50 and the right about 75 rpm. Im guessing it has to be the switch because if it was the mag wouldn't it run a little rougher even when switched to both because your only actually running on one mag. Or could it be a grounding issue? It didn't even run rough it was killing the engine when switched to the right mag.
Thanks for any ideas
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Old 05-12-2013, 07:14 PM
DanBaier's Avatar
DanBaier DanBaier is offline
Join Date: Mar 2009
Location: Rochester NY
Posts: 638

You might want to see if you haven't inadvertently grounded the mag with the p-lead (some stray part of the p-lead is grounding to the case). It's a little tricky to find, but I've had this happen.

(You shouldn't try starting with the p-lead disconnected, the engine might kick back and cause some damage. You want the right mag off line when you try to start.)

RV7A (N7101) - Flying 10/2008
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Old 05-13-2013, 07:33 PM
scottmillhouse's Avatar
scottmillhouse scottmillhouse is offline
Join Date: Apr 2007
Location: Madison, AL
Posts: 189

I had a similar problem with a right slick mag that turned out to be the coil. It worked fine when cool but once shut down for a short while it would heat soak and short out and then be fine once again when cooled. It was a challenge since it would cool down by the time the tools were out and the cowl was off. With high coil and rebuilt cost- a call to Aircraft Spruce and then back flying in a day with a new mag.
Scott- 2018 dues paid
Got medical back, now building a 7A.
RV-12 #120515, 319RV over 225 hours.
1st flight 12/08/15, flew SNF, Oshkosh, Triple Tree & SERFI in year 1!
RV-9A, 536 hours, sold, RV-7 sold, Kitfox sold
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Old 05-13-2013, 08:30 PM
albertaflyer albertaflyer is offline
Join Date: Oct 2010
Location: Red Deer, Alberta
Posts: 71

Thats interesting! So through expansion it would make contact then Im guessing.
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Old 05-13-2013, 08:47 PM
bhester's Avatar
bhester bhester is offline
Join Date: Jan 2005
Location: Hopkinsville, KY
Posts: 801
Default Tempest Replacement Coil

Tempest makes a replacement coil
Bobby Hester - Builder/Pilot/A&P
Surfing the web from Hopkinsville, KY
N857BH RV7A XP-O360 - Garmin G3X ADS-B IN/OUT 2020 Compliant
Web site:
Dec. 2017 VAF donator - alot better than any magazine subscription
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