Magneto

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2013: Magneto
Top of pagePrevious messageNext messageBottom of page Link to this message  By paul beedle on Tuesday, May 28, 2013 - 06:58 pm:

when I turn my key to magneto it starts missing and runs rough I put a new mag in


Top of pagePrevious messageNext messageBottom of page Link to this message  By Garnet on Tuesday, May 28, 2013 - 07:32 pm:

Are your coils expertly tuned up Paul? Plain old every day coils just won't give you the performance that a set of coils will that have been rebuilt properly. Most people think that coils are just coils, and that contacts are just contacts and there's nothing fussy or important about them ...

Garnet


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Tuesday, May 28, 2013 - 09:29 pm:

If you have a friend who has a T which runs good on magneto, borrow his coils and try them in your car. If that fixes the problem, you need to rebuild your coils.

Have you checked the output of your magneto? It should generate from 6 volts AC at idle to nearly 30 volts AC at high speed. Use an analog voltmeter. There are other posts which describes exactly how to measure with a light bulb in parallel to the volt meter.

If the voltage is low, the magnets need to be charged and or ring repaired or replaced. With the voltage low, rebuilding the coils will not help.

Another potential problem could be your ignition switch. Try reversing the wires between battery and magneto on the switch and see if the engine still runs on battery. But don't accidently connect the battery to the magneto or you will discharge the magnets. If it still runs good on battery but not on magneto, the problem is not in the switch.
Norm


Top of pagePrevious messageNext messageBottom of page Link to this message  By joe bell on Tuesday, May 28, 2013 - 09:30 pm:

Paul, was the magnets recharged and the gap set from .025-.045? if yes then I would say it is coil issues, another trick to try is after it is warmed up take your mag wire and go directly to the coil box to rule out a bad switch, I have had a couple that the switch was shorted out.


Posting is currently disabled in this topic. Contact your discussion moderator for more information.
Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration