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test ignition coil?

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=95674
Printed Date: May 13, 2025 at 12:57 AM


Topic: test ignition coil?

Posted By: citrus3000psi
Subject: test ignition coil?
Date Posted: July 17, 2007 at 9:26 AM

Im wanting to see what the VDC output and amerage is.  Im not exactally sure how to check this.  I think I make a voltage divider with some resistors and check it but as for the current, how do I put a max load.  I guess I can short it out but not exactly sure how to...  Any help would be appreciated.




Replies:

Posted By: DYohn
Date Posted: July 17, 2007 at 11:41 AM
I recommend you do not do this at all, especially not "shorting it out!"  Go to an auto electrical shop for assistance.  What's your purpose for doing this test?

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Posted By: citrus3000psi
Date Posted: July 17, 2007 at 1:50 PM

I need to really see what the current is.  I can assume the coil puts out between 15k - 20k vdc.  I would imagine the amps are very little.

Car ignition coils are not as dangerious as they sound.   A wall socket is much more lethal then a ignition coil.

Im building a tesla coil and need to know my max amps to help me finish the rest of build.




Posted By: citrus3000psi
Date Posted: July 17, 2007 at 2:17 PM

I found some more information.   I get a pretty close measurment of the VDC if I use this equation by jumping a spark.

V = 30pd + 1.35 kV, where d is in centimeters, and pis in atmospheres.
 
But I would imagine that the inline resistors as a voltage divider will work and give a more accurate reading on the multimeter then guesing the gap distance.


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