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Ken McGregor 
Bronze Level
Joined: 11 Sep 2009
Location: Strathroy, Ont
Points: 142
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 Topic: WD 45 coil grounding?
Posted: 10 Aug 2016 at 9:05am |
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I recently read something about a WD45 having power losses when opened-up but would idle not too bad. There were a couple of postings advising an inspection of the coil grounding. I need more information on this. Is it just the clamp-around holder that fastens into the distributor housing or what exactly are we talking about here. I only have the one wire (6V) to the coil and the high test wire coming out of course.
Just showing my ignorance but someone has to ask;>((
regards,
Ken McGregor
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CAL(KS)
Orange Level
Joined: 18 Sep 2009
Location: Chapman, KS
Points: 3789
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Posted: 10 Aug 2016 at 9:23am |
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the circuit is completed through the points whether positive or negative with the feed wire on the other side of the coil. maby they were referring to the coil grounding internally, and to check with a ohm meter
Edited by CAL(KS) - 10 Aug 2016 at 9:24am
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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DougS
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Joined: 03 Nov 2011
Location: Iowa
Points: 2490
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Posted: 10 Aug 2016 at 9:28am |
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No, the other end of the high voltage circuit is grounded through the coil case. That's different from the primary (points) circuit. Check the case of the coil and ensure that it has a low resistence to the engine block.
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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
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Posted: 10 Aug 2016 at 10:09am |
 DougS wrote:
No, the other end of the high voltage circuit is grounded through the coil case. That's different from the primary (points) circuit. Check the case of the coil and ensure that it has a low resistence to the engine block.
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No, that's not how it works. There was discussion on the Facebook A-C page. I posted some pics from a text book I saved from when I went to trade school. The coil secondary and primary negative terminals are tied together. The coil case is insulated from the windings. There is one exception to this which is GM HEI with the coil in cap systems. In 74 when it was first offered, the coil secondary was tied to the negative. In 76 they were changed to a separate ground. Otherwise the only time when you see a coil grounded is because there is a condenser or radio noise suppressor attached to the coil bracket. You can take the coil loose while the engine is running (not GM HEI) and it will not bite you. If you do facebook, find my page Brian Watson. I put a few pics of the old text book that was compiled by Sun Electric.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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DougS
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Joined: 03 Nov 2011
Location: Iowa
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Posted: 10 Aug 2016 at 10:30am |
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Then kindly point out the high voltage (spark) return path to me when the points are open, as they are when the plug fires.
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Brian Jasper co. Ia
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Posted: 10 Aug 2016 at 10:32am |
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Through the condenser.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Brian Jasper co. Ia
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Location: Prairie City Ia
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Posted: 10 Aug 2016 at 10:36am |
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Remember, the condenser does two jobs. It reduces arcing at the points. It also assists in charging the coil primary.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Brian Jasper co. Ia
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Posted: 10 Aug 2016 at 1:47pm |
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Brian Jasper co. Ia
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Location: Prairie City Ia
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Posted: 10 Aug 2016 at 1:50pm |
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The preceding pics come from Sun Electric Electronic Ignition Diagnosis and Testing 1985 Edition.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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