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Test ignition coil

  • Thread starter Thread starter D.Harrison
  • Start date Start date
D

D.Harrison

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How do you do a funtional test on a coil to see if it is good or bad?
 
Last edited:
Connect a multimeter between the two terminals on the coil setting the meter to the ohms scale. A 3 ohm coil is ok if it shows between 3 and 5 ohms.
Points type ignitions used 5 ohm coils and electronic ignitions used 3 ohm.
I have not had any problems using either system with coils showing 3 to 5 ohms resistance across the terminals. Resistance between the spark plug caps should be 30 to 50K ohms if you have the stock 5k resistor caps on each spark plug wire.

E.


D.Harrison said:
How do you do a funtional test on a coil to see if it is good or bad?
Click to expand...
 
I checked the coilsand I got 3.13 ohms on both coils. I read 104ohms on 1-4 and 96 ohms on 2-3. I did the test out of the Climer book by hooking up the voltmeter to the pickup coil leads into the CDI box. Still no spark. I have voltage present when key on none when key off. Do I rip it all apart and buy dyna s?
 
To get a 104/96 ohm reading, it sounds like you're set to the wrong scale on your meter. You want a scale that covers 30,000 to 50,000 ohms.

E.


D.Harrison said:
I checked the coilsand I got 3.13 ohms on both coils. I read 104ohms on 1-4 and 96 ohms on 2-3. I did the test out of the Climer book by hooking up the voltmeter to the pickup coil leads into the CDI box. Still no spark. I have voltage present when key on none when key off. Do I rip it all apart and buy dyna s?
Click to expand...
 
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