Coil died ???

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Model T Ford Forum: Forum 2012: Coil died ???
Top of pagePrevious messageNext messageBottom of page Link to this message  By Keith Townsend ; ^ ) Gresham, Orygun on Monday, August 27, 2012 - 06:48 pm:

A friend of mine called the other day with a coil problem. I grabbed a freshly rebuilt coil and slipped it in place. Problem solved.

I took the coil home to fix it. It had been rebuilt with the proper capacitor at one point, but the rebuilder filled it up with some sort of rubbery-blubbery silicone calk stuff. I dug it all out and re-soldered the bad looking solder joints, checked the point gap, did all the standards checks for continuity, etc. The coil beeps with the Regan coil beeper.

I put it on the Strobospark, and it buzzes just fine, draws 1.3 amps, but there is NO spark on the scope!

Does this coil have a break somewhere inside, where it is arcing, and not delivering the spark where it belongs?

Is this coil now junk?

: ^ (

Keith


Top of pagePrevious messageNext messageBottom of page Link to this message  By John F. Regan on Monday, August 27, 2012 - 07:09 pm:

It either has an internal arc that you cannot see or perhaps some shorted turns in the secondary that are killing the energy. It only takes continuity in the primary to make the coil buzz assuming the points are OK but the secondary can be arcing and the coil beeper would not be able to test for that. It is a fairly rare event as are shorted turns since they would not have a large impact on the secondary DC resistance measured.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Doug Money - Braidwood, IL on Monday, August 27, 2012 - 09:40 pm:

That's why one is supposed to use tar. Tar doesn't let moisture in.


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