Ohm readings
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Senior User
Joined: Aug 2007
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From: Winnfield,La.
Ohm readings
Another question, I was sitting at my work bench and took the three coils I have and decided to do an ohms reading so I placed the red lead of my digital meter in the center and took readings from both positive and negative post this is what I got, FIST COIL 138.6 ON BOTH POLLS, second coil gave 7.15 on both and the third was 10.80, my question is, dose this mean anything? The black lead was placed on each post to obtain these readings.
Cargo Master
Joined: Mar 2008
Posts: 2,573
Likes: 207
From: Washington
To test a coil you need to check the resistance of the primary and the secondary windings. The coil negative post is the common point to both the primary and the secondary windings. You will hook up the black lead of your ohm meter to the coil negative. To test the primary touch the red lead to the coil positive post, to test the secondary windings touch the red lead to where the coil wire output connects. In an older round coil you will see about 1.5-2 ohms in the primary. In a newer style square coil you will have about .5 ohm in the primary windings. The secondary windings have high resistance due to more winding which is how the voltage is stepped up. Look for 7000-10,000 ohm in the secondary. The exact reading is not that important, just something close.
Good luck
Good luck
Cargo Master
Joined: Mar 2008
Posts: 2,573
Likes: 207
From: Washington
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Senior User
Joined: Aug 2007
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From: Winnfield,La.
well after rechecking the coils I am even more confused than before, on the two ford style coils I had this from neg post black test lead to bat one gave me 1.23 the other was 2.02 then placed the red lead to the secondary poll coil to distributor and got 8.98 and 7.23 so I guess they are bad?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The 8.98 and 7.23 were probably in the Kohm scale; did you check? What the number on the scale\display means depends on the scale you are set to; unless it is an auto-ranging in which case it will tell you.
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