MAG pushes 10 volts only - went all of a sudden- Time to pull the engine out!!---- Doooooh !

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Model T Ford Forum: Forum 2014: MAG pushes 10 volts only - went all of a sudden- Time to pull the engine out!!---- Doooooh !
Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dare - Just a little South West . on Friday, November 14, 2014 - 01:53 am:

Thank you previously for the many ideas on how to check and test, l have done all of those and put the meter on just now,10 volts only at reasonably high revs... the globe glows, but not anywhere near as bright as the two other T's.
wire inside ??I don't know, but its about to come out for a good look see and check.
Hmmmmmmm.
David.


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Chantrell - Adelaide, Australia on Friday, November 14, 2014 - 01:59 am:

Why take it out David? Leave it in there until you need to do something major, unless you have other plans.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Warwick Landy on Friday, November 14, 2014 - 04:11 am:

David,

Before you pull the engine you might like to try my E timer for awhile??? Just check that the mag coil is not unwinding itself anywhere first! The E Timer is a good solution for running on battery with excellent performance. It is here if you want to try it!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Georgetown TX on Friday, November 14, 2014 - 05:55 am:

You should be able to do an in - car recharge with the symptoms you describe David.
All you need is three 12V batteries and two pair of jumper cables.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Jablonski on Friday, November 14, 2014 - 07:15 am:

David:

Sorry to admit, but the same event happened to our '26. Found a bearing shim jammed between the mag coil frame that cut into the winding insulation that shorted part of the magneto..... that was before the engine rebuild.

Most likely there is some debris at the magneto post. Check, clean, reinstall, take readings.... may have to do recharge procedure.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Jablonski on Friday, November 14, 2014 - 07:16 am:

Wouldn't hurt to take advantage of Warwick's offer either.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Hal Davis-SE Georgia on Friday, November 14, 2014 - 07:20 am:

If it happened all of a sudden, my money is on one of the field coils being grounded. It is still generating electricity on the portion of the circuit between the grounded coil and the mag post, but the portion between the grounded coil and the intended ground is not contributing. Those who know more than I can verify, but assuming the relationship is linear, I'm betting your ground is in the neighborhood of the 5th or 6th coil from the mag post.


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dare - Just a little South West . on Friday, November 14, 2014 - 01:41 pm:

Warwick, OK l will try the E timer, l would prefer the mag working properly, but as an interim measure, why not.
My guess is that l will know within minutes if it works significantly better.
Although its a band aid to the real problem, which l have yet to locate.

David.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Jablonski on Saturday, November 15, 2014 - 07:48 am:

David:

Please keep us updated on your progress. Thanks !!

Bob J.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Gregush Portland Oregon on Saturday, November 15, 2014 - 11:26 am:

So why not just run the coils on a 12 volt battery? Even a small motorcycle one will give you many miles. If it has a 6 volt system, you know that it will go and drive running on 6 volts.


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