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AaronSEIA 
Orange Level
Joined: 11 Sep 2009
Location: Mt Pleasant, IA
Points: 2584
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 Topic: FMJ Mag Help
Posted: 04 Nov 2019 at 4:02pm |
Working on getting my WC back running and have hit a snag. Mags are magic as far as I'm concerned and I need some help. Should I have continuity across the points when closed? I don't know
if it's my multi tester or what, but I'm not getting any. Plug wires show infinite ohms which would mean open circuit. I get about 4800 ohms resistance
between the condenser side wire of the coil and the center lug. About
1.2 ohms between the 2 wires of the coil. Can't seem to test the
condenser with a digital multi tester. Short of sending this thing to
someone and spending a lot of money, what's the best course of action?
Point/condenser and plugs/wires? Coil seems to test OK I think. Not a lot of run time on the mag, but it's been 20 years since it went together. AaronSEIA
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Gerald J.
Orange Level
Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 04 Nov 2019 at 5:04pm |
Sounds like there are several wires disconnected in the magneto. The resistance at the points should be the primary coil resistance with the points open and zero with the points closed. Might be a sign that the points need a thorough cleaning. I have a shop manual for FMJ at: http://geraldj.networkiowa.com/Trees/FM-Xmagneto.pdf Might not be the perfect match to your magneto but the findamentals should be similar. Gerald J.
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Steve in NJ
Orange Level Access
Joined: 12 Sep 2009
Location: Andover, NJ
Points: 12071
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Posted: 04 Nov 2019 at 5:34pm |
Take some TV tuner cleaner or Brakekleen and give a spritz to the points and run a rag through the contacts. Do this a couple times. Sounds like there's ozone or a film or corrosion on the contacts. Don't use a file, cause all that will do is remove the cadium plating from the contacts. The Cadium helps keep corrosion down. When they sit for a long time, they'll get a film on them and boom, no spark...... Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Dave Richards (WV)
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Joined: 14 Sep 2009
Location: Fairmont, WV
Points: 881
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Posted: 05 Nov 2019 at 8:41am |
You are showing your age Obiwan. Do they still call it tuner cleaner in your area or do you just have a very old can? Sorry, no pun intended.
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chaskaduo
Orange Level
Joined: 26 Nov 2016
Location: Twin Cities
Points: 5200
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Posted: 05 Nov 2019 at 8:57am |
How about Variable Pot, say that and you'll have every millennials attention within ear shot. 
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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22825
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Posted: 06 Nov 2019 at 9:37pm |
An old timer told me once, he used a dollar bill to drag thru the points. Said there was enough dirt and grit built up on an older bill to polish them just enough. Then drag a piece of white paper thru to clean up any leftovers. With a digital meter, check ohms, then switch to voltage. The ohm meter should charge the condenser and when you check voltage, it should slowly drop off.
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Steve in NJ
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 12071
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Posted: 07 Nov 2019 at 1:14pm |
Guess I'm showin' ma' age Dave. They don't make TV tuner cleaner anymore?.....Still have a can of that on the shelf. Still works! LOL!! Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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chaskaduo
Orange Level
Joined: 26 Nov 2016
Location: Twin Cities
Points: 5200
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Posted: 07 Nov 2019 at 1:20pm |
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Charlie when you say, "With a digital meter, check ohms", where are you using the test leads, and are the points open or closed?
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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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