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Username Post: 12v coil test        (Topic#357781)
995jim 
Contributor
Posts: 540
995jim
Loc: Ohio
Reg: 12-17-06
08-24-19 05:47 PM - Post#2773974    

Hello, Can someone tell what device do I want to use to test output of a 12v coil ?
thanks jim

Jim

65' Impala SS, 65' Belair, 89' Silverado Z71, 95' Silverado Z71, 12' Silverado, 15' Silverado LTZ, 16' Tahoe LTZ


 


Shepherd 
Frequent Contributor
Posts: 2116

Loc: Lake George, NY
Reg: 11-11-15
08-25-19 01:30 PM - Post#2774017    
    In response to 995jim

An ignition scope can display maximum voltage by disconnecting one plug wire. Is this your target?



 
995jim 
Contributor
Posts: 540
995jim
Loc: Ohio
Reg: 12-17-06
08-28-19 09:29 AM - Post#2774295    
    In response to Shepherd

Well im going to replace pounts, condenser but was going to check coil just to eliminate problem of no spark at the plug. There is 12v to the coil
Thanks jim

Jim

65' Impala SS, 65' Belair, 89' Silverado Z71, 95' Silverado Z71, 12' Silverado, 15' Silverado LTZ, 16' Tahoe LTZ


 
IgnitionMan 
Valued Contributor
Posts: 3771

Reg: 04-15-05
09-19-19 07:46 AM - Post#2775879    
    In response to 995jim

You are already aware resistance tests are no longer valid in almost every instance, as they only work on a cool, or cold coil. The methods above are excellent, but not all have access.

A good auto parts store might well have an off vehicle electrical tester that will,run a coil,all the way to its operating temperature with an active spark test. They work well to test a coil.



 
drummertom 
Member
Posts: 1932
drummertom
Age: 67
Loc: Durham NC
Reg: 09-03-06
10-15-19 04:46 AM - Post#2777924    
    In response to Shepherd

Is it a standard old can coil? If so you can use a spark plug or better, a spark tester. Put +12V to the pos side, plug in a plug wire and a spark plug to the coil. Make sure the body of the spark plug is grounded. then momentarily touch a wire between the - terminal on the coil and a ground. This causes the coil to fire and should cause the light in the spark tester to come on. It will flash, not stay on, but it should flash every time you touch the - terminal. What points in a distributor do is complete a circuit to ground which causes the coil to fire, which is what you do in the test above. Hope this helps.


www.picturetrail.com/drummertom

"Well my time went so quickly. I went lickety spickley out to my ol' 55"


 
IgnitionMan 
Valued Contributor
Posts: 3771

Reg: 04-15-05
10-15-19 09:01 AM - Post#2777939    
    In response to IgnitionMan

I am adding that to properly test a coil, it needs to be at operating temperatures, NOT cold, warm.

To do that, it needs to b run enough to get it up to temperature, and that makes the parts store run tester the best option.



 


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