[AJD] Wico Coil and Condensor testing with Multimeters

[Bill Brueck]

A meter can verify a bad coil or condensor, but it can't verify that one is 
good.

Different coils will have different resistances, but I do have specs for a 
Wico C coil, I expect the X will be similar.  The primary winding is rated 
at .3 ohms.  Something more than 0 but not much.  The secondary winding is 
rated at 7000 ohms.   And the coil can still fail under load, the current 
from the meter isn't much of a test.

For the condensor, with the meter on high ohm range (x 10,000 or x 100,000) 
the meter should deflect upon first contact but settle down quickly to 
infinite or very high resistance: several meg.  Then put it aside for a 
minute and do this again.  If the condensor holds a charge it will pick 
right up with the same high resistance.  If it deflects again, it is 
leaking.  Be sure to hook the leads up in the same polarity both times.

Hope that helps.

B²
Bill Brueck (brick)
Chatfield, MN, USA

----- Original Message ----- 
From: "Chris C" <jdnutinwa at yahoo.com>
To: "ATIS LIST" <antique-johndeere at lists.antique-tractor.com>
Sent: Tuesday, January 25, 2005 1:24 AM
Subject: [AJD] Wico Coil and Condensor testing with Multimeters


>
>
>   Can anyone help me out with this?  My Electrical
> System service manual is just about useless.  I want
> to test a condensor and Coil on an XH mag I am working
> on,  but I don't happen to own the special 3 lead JD
> tester the book mentions and I don't have the charts
> and tables they refer to either.
>
>     Can you test the condensor and coil with a two
> lead multi meter?  If so can someone guide me through
> it?
>
>                Chris
>
>
>
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