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Jonah D'Avella
Topic author - Posts: 700
- Joined: Mon Jul 27, 2020 8:00 am
- First Name: Jonah
- Last Name: D'Avella
- * REQUIRED* Type and Year of Model Ts owned: 1926 Touring
- Location: Kingsport TN
- Board Member Since: 2020
Help!
Okay, so I am completely baffled. A few weeks ago my Magneto completely stopped working even though it is still out putting power. I think somehow it is grounded but I don't know why it is still out putting power then. Any thoughts? I have tested everything I know to do with a voltmeter.
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Humblej
- Posts: 1957
- Joined: Sun Jan 06, 2019 12:23 pm
- First Name: Jeff
- Last Name: Humble
- * REQUIRED* Type and Year of Model Ts owned: 1926 Canadian coupe, 1924 TT C-cab, 1924 runabout
- Location: Charlevoix, Mi
- Board Member Since: 2006
Re: Help!
If your mag is producing power, your problem is not your mag, it is your wiring or ignition switch.
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John iaccino
- Posts: 818
- Joined: Mon Jan 07, 2019 5:25 am
- First Name: John
- Last Name: Iaccino
- * REQUIRED* Type and Year of Model Ts owned: 1911 Roadster, Open Runnabout
- Location: Rhinebeck, NY
Re: Help!
Check your mag plug on top of the hogs head. It may have a lot of 'fuzz' on it, blocking the electrical connection.
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Rich Eagle
- Posts: 6895
- Joined: Fri Jan 04, 2019 10:51 am
- First Name: Richard
- Last Name: Eagle
- * REQUIRED* Type and Year of Model Ts owned: 1909 TR 1914 TR 1915 Rd 1920 Spdstr 1922 Coupe 1925 Tudor
- Location: Idaho Falls, ID
Re: Help!
I found that caused by a loose wire at the terminal block. It's easy to check.
Just a possibility.
Rich
Just a possibility.
Rich
When did I do that?
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Scott_Conger
- Posts: 6523
- Joined: Sun Jan 06, 2019 11:18 am
- First Name: Scott
- Last Name: Conger
- * REQUIRED* Type and Year of Model Ts owned: 1919
- Location: not near anywhere, WY
- Board Member Since: 2005
Re: Help!
Jonah
unless you are using an analog meter and a load, you really don't know what your mag is doing.
do the test here: http://www.mtfca.com/discus/messages/70 ... 760271.pdf starting with the mag post output.
If no go, then pull the mag post and test directly to the solder blob on the top of the mag
if no go, then it is dead, and if it went dead suddenly, you may have inadvertantly demagenetized the magnets and you may well need the magnets recharged.
Do the test first, though.
unless you are using an analog meter and a load, you really don't know what your mag is doing.
do the test here: http://www.mtfca.com/discus/messages/70 ... 760271.pdf starting with the mag post output.
If no go, then pull the mag post and test directly to the solder blob on the top of the mag
if no go, then it is dead, and if it went dead suddenly, you may have inadvertantly demagenetized the magnets and you may well need the magnets recharged.
Do the test first, though.
Last edited by Scott_Conger on Fri Dec 31, 2021 5:35 pm, edited 1 time in total.
Scott Conger
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
Tyranny under the guise of law is still Tyranny
NH Full Flow Float Valves™
Obsolete carburetor parts manufactured
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Norman Kling
- Posts: 4634
- Joined: Tue Jan 08, 2019 1:39 pm
- First Name: Norman
- Last Name: Kling
- Location: Alpine California
Re: Help!
Do these things first. Check the wire between the magneto post and the terminal block. Then check the wire between the terminal block and the ignition switch. You should have continuity between all these points, however, there should be no connection between the magneto and the battery. Be sure that the switch either connects to the magneto or the battery, but not both at the same time. With the engine off, press the clutch lever into the low position and then let it out into the high position. Then go to the front of the engine and gently pry the pulley forward. If the crankshaft moves noticeably you have too much end play. This must be addressed before the magneto will work correctly.
Next step start the engine on battery and take an analog AC voltmeter between the ground and the magneto post. At idle, you should have 6 V AC or more. And it should increase with the speed of the engine. If you don't have the 6 V but the end play is OK, you might be able to recharge the magnets. If not, you might need to pull the engine and transmission to repair the magneto.
Norm
Next step start the engine on battery and take an analog AC voltmeter between the ground and the magneto post. At idle, you should have 6 V AC or more. And it should increase with the speed of the engine. If you don't have the 6 V but the end play is OK, you might be able to recharge the magnets. If not, you might need to pull the engine and transmission to repair the magneto.
Norm