Coil Testing - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 6 (permalink) Old 11-07-2009, 05:09 PM Thread Starter
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Coil Testing

I just picked up a set of used 12volt 650 Triumph coils from a guy. They came off a '69 T120 that's been sitting. I'll also be using them on a '69 T120.I am a long way away from needing coils on my project, But I'm short on cash an the price was right(free). I'm not sure how old these things are. they are stamped Made In Germany. I was just wondering if there is a way to test the coils off the bike to see if there any good. Also how often will you have a problem with coils. Do they ever ware out? If so about how many miles can you get out of em before you start to have problems?
..Thanks Guys any input helps..
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post #2 of 6 (permalink) Old 11-07-2009, 06:05 PM
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Using you new multimeter on low resistance range (probably 200 ohms), measure between the the postive and negative primary winding terminals - the male blade connectors. You should see around 4-6 ohms.

Next, using the 20K resistance range on the meter, measure between either of the blades and the output high-tension connector (where the plug lead goes in on the top), and you should see between 5-6 Kohms.

Next, on highest resitance range (probably 20Mohms) measure between either blade terminal and the outer metal casing. You should see infinite resistance (1 followed by blanks on the meter screen). Don't have your fingers touching the metal probe ends during this test, as your body resistance will affect the reading.

If any of theses tests show abnormal readings, come back to us with the readings and we'll advise from there.

Coils can break down with internal shorted windings, overheating due to loss of oil (used to cool the internals in some coils), and dents in the casing causing shorts.
HTH

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post #3 of 6 (permalink) Old 11-07-2009, 07:11 PM Thread Starter
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Ok I've got 04.3 between the the postive and negative primary winding terminals on both.

Ive got 6.63 on one and 7.07 on the other, between either of the blades and the output high-tension connector

between either blade terminal and the outer metal casing it shows 1. so there are no shorts on the case.

I think this means I'm good. Please let me know if I'm wrong

Thanks for the input Guys

Last edited by sjw867; 11-07-2009 at 07:14 PM.
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post #4 of 6 (permalink) Old 11-07-2009, 07:43 PM
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I'd say you be pretty good to go. Make sure all the connectors are clean, and that there is no crud around the top of the HT terminal area - clean with methylated spirits or alcohol.

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post #5 of 6 (permalink) Old 11-08-2009, 12:38 PM
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"Made in Germany" possibly made by PVL? I have a couple on my Bonnie and haven't had a problem with in the 8-10 year they've been on there.
Good tip on the coil testing.
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post #6 of 6 (permalink) Old 06-12-2012, 09:53 AM
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I think this may have helped solve my problems. Is there any difference between the readings in older coils and the coils that come with a Boyer electric ignition? Both coils have readings on the primary windings of 2.1. Between the high-tension connector and a blade, the coils had readings of 7.03 and 7.31. The last was correct, as mentioned above.

Oh yeah, I have a 65' Triumph TR6. Should have mentioned that first.
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