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Burning up coils On my AC-b
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LBOW View Drop Down
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Joined: 25 Apr 2023
Location: Spokane
Points: 16 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LBOW Quote  Post ReplyReply Direct Link To This Post Topic: Burning up coils On my AC-b
    Posted: 02 Aug 2023 at 3:22pm

Just wondering what would make 2 wico x coils go bad in a short amount of time, I wasn't running it very hard, but I was starting and stopping a lot. Second coil didn't even last a day. I have a distributor setup from a CA, I think I'll try running that instead but I'm curious why a coil would fail so quickly... Thanks
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Ken Mn View Drop Down
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Joined: 10 Nov 2021
Location: Zumbrota Mn.
Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken Mn Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2023 at 3:32pm
LBOW: Using Wico coils, does that mean you are running a magneto?
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LBOW View Drop Down
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Joined: 25 Apr 2023
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Points: 16 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LBOW Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2023 at 3:49pm
Yes, wico x magneto... ran great for a long time, now I'm afraid to order another coil... (Actually a prestolite)

Edited by LBOW - 02 Aug 2023 at 3:51pm
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Ken Mn View Drop Down
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Joined: 10 Nov 2021
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Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken Mn Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2023 at 4:48pm
As long as you do not have any battery power connected to your magneto you are not burning up the coil. I have heard though that resistor spark plug wires are bad. They must be wire type and do not gap the spark plugs wider than spec. Doing so requires the coil to have to build up the voltage higher than normal before the plugs fire and that can cause the insulation in the coil to break down and short out ruining the coil.
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LBOW View Drop Down
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Joined: 25 Apr 2023
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Points: 16 		Post Options Post Options   Thanks (0) Thanks(0)   Quote LBOW Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2023 at 5:10pm
Thanks.
The wires and plugs are correct but could it have anything to do with the condenser spiking the voltage...? I never did change it out. And as I was working on the hydraulics I was crank starting it a lot... No battery
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Ken Mn View Drop Down
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Joined: 10 Nov 2021
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Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken Mn Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2023 at 6:49pm
The condenser won't cause a coil to fail.
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HudCo View Drop Down
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3954 		Post Options Post Options   Thanks (0) Thanks(0)   Quote HudCo Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2023 at 10:56pm
make sure your kill wire is not getting battery voltage some how
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JC-WI View Drop Down
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Joined: 11 Sep 2009
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Points: 34380 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JC-WI Quote  Post ReplyReply Direct Link To This Post Posted: 02 Aug 2023 at 11:45pm
Same thought I had...
"make sure your kill wire is not getting battery voltage some how "

 Or shorting out before the kill switch. Disconnecting the grounding wire and still no spark, that is a puzzle unless there's dirt or corrosion in the points... or bad grounding of the points... or of the coil.
Magnets strong?
He who says there is no evil has already deceived himself
The truth is the truth, sugar coated or not. Trawler II says, "Remember that."
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