Spark from one of the coils.

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Model T Ford Forum: Forum 2016: Spark from one of the coils.
Top of pagePrevious messageNext messageBottom of page Link to this message  By Jonathan Delancey on Sunday, September 18, 2016 - 11:43 pm:

When I run the T in the dark, I see one of the coils throwing a spark from the top! What does this mean?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Steven Thum on Monday, September 19, 2016 - 12:36 am:

All the coils should have a little bit of spark at the points. This is normal. If the spark is big and blue it usually means the capacitor is failing.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Chris Barker, Somerset, England on Monday, September 19, 2016 - 04:34 am:

Steven's answer is correct if the spark is at and across the points. If the spark is coming from anywhere else there is a fault. Damp could have entered and allowed a 'leak'. This can result in the wood becoming carbonised and the leak then continues even when dry. Or there is an open circuit somewhere in the secondary coil and the HT finds another route.


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