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How do I bench test a coil #777998 08/19/10 10:12 AM 08/19/10 10:12 AM
Joined: May 2010 Posts: 219 Southwest way2fast OP enthusiast
way2fast OP enthusiast Joined: May 2010 Posts: 219 Southwest	Can someone tell me how to bench test a coil?? Go Fast and Swerve!

Re: How do I bench test a coil [Re: way2fast] #777999 08/19/10 10:34 AM 08/19/10 10:34 AM
Joined: Dec 2009 Posts: 580 PA Moparzrule mopar
Moparzrule mopar Joined: Dec 2009 Posts: 580 PA	http://www.mymopar.com/coiltest.htm My Own Personal Adrenaline Rush

Re: How do I bench test a coil [Re: Moparzrule] #778000 08/19/10 11:12 AM 08/19/10 11:12 AM
Joined: May 2010 Posts: 219 Southwest way2fast OP enthusiast
way2fast OP enthusiast Joined: May 2010 Posts: 219 Southwest	Perfect... Thanks!!!!!!!!!!!!!!!!! Go Fast and Swerve!

Re: How do I bench test a coil [Re: way2fast] #778001 08/19/10 07:20 PM 08/19/10 07:20 PM
Joined: Jan 2008 Posts: 199 douglasville,ga R ramrod member
ramrod member R Joined: Jan 2008 Posts: 199 douglasville,ga	You might want to check it when its hot too. Throw it in the oven for awhile at 150 degrees and then check it. I had a coil that checked fine when it was cold but was shorting internally when it got hot! "That Plymouth had a Hemi with a Torqueflite." -Driver

Re: How do I bench test a coil [Re: Moparzrule] #778002 08/20/10 10:31 AM 08/20/10 10:31 AM
Joined: Feb 2003 Posts: 8,020 Pangaea B5 Bee master
B5 Bee master Joined: Feb 2003 Posts: 8,020 Pangaea	I have a coil that checks .80 primary, 13,500 secondary. Will a secondary reading over 11,000 trend to burnt out ballasts and ECUs? I went thru 4 ballasts and 2 ECUs within 4 months until I changed this coil out. I now have a MP chrome ECU, Accel 8145 coil and a 1.2ohm balast, 4 years with no failures.

Re: How do I bench test a coil [Re: Moparzrule] #778003 08/20/10 10:56 AM 08/20/10 10:56 AM
Joined: Jan 2003 Posts: 17,892 S.E. Michigan ZIPPY I Live Here
ZIPPY I Live Here Joined: Jan 2003 Posts: 17,892 S.E. Michigan	Quote: http://www.mymopar.com/coiltest.htm Also ohm out coil tower to case, + to case, and - to case. Any reading other than zero = junk, windings are shorted to the case. Rich H. Esse Quam Videri

Re: How do I bench test a coil [Re: ZIPPY] #778004 08/20/10 01:18 PM 08/20/10 01:18 PM
Joined: Feb 2003 Posts: 913 C CrazyD super stock
CrazyD super stock C Joined: Feb 2003 Posts: 913	FYI, ohm values spec'd in 69/70 FSM are as follows at 70-80 degrees F: 2444241 Primary 1.41-1.55 ohms Secondary 9200-10700 ohms 2444242 Primary 1.65-1.79 ohms Secondary 9400-11700 ohms

Re: How do I bench test a coil [Re: way2fast] #778005 08/21/10 10:06 AM 08/21/10 10:06 AM
Joined: Jan 2006 Posts: 8,162 USA 3 360view Moparts resident spammer
360view Moparts resident spammer 3 Joined: Jan 2006 Posts: 8,162 USA	When I was fooling around checking out the stock Magnum V8 ignition coil, and the after-market alternatives, I found in my junk pile a small 'wall wart' transformer that put out 5 volts AC, cut off the cord plug, and connected the wire ends to the low side terminals of the coil, then measured the AC output voltage of high side of the coil by measuring with an AC voltmeter from the center high voltage connector to ground. This allows you to measure the 'turns ratio' of the internal wiring of the ignition coil. The turns ratios of stock ignition coils usually lie in the 60 to 100 range. The turns ratio can also be used to find the 'inductance' of the coil. This online web app from the 'MegaSquirt Guys' allows simulating how a ignition system 'might' perform if you know some of these measurements: http://www.bgsoflex.com/igncoil.html

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