| flatheadfan | -- 07-01-2020 @ 11:37 PM |
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I have a new 6 volt coil (can type), clearly marked on top with a "+" terminal on one side and a "-" on the other side. As we know Ford's are postive ground whereas many 6 volt GM cars were negative ground. How can the same coil work in different ground circumstances? Or, does it matter? Thanks Tom
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| 40 Coupe | -- 07-02-2020 @ 4:28 AM |
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The can type coils will work with battery - on the + terminal BUT expect poor performance from the coil output. So putting battery + to the coil + terminal is best for peak coil performance. It does not matter if + is connected to the vehicle frame and engine block (ground) or if + is coming off the ignition switch (isolated from ground). Connect + to + The original ford coils that are mounted on top of the distributor only have one input terminal and depend upon mounting screws (ground) for their second battery input polarity. So connecting the battery + to ground is important to get the proper battery polarity to the proper coil input.
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| TomO | -- 07-02-2020 @ 6:26 AM |
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Coils are transformers and do not care about polarity. Spark plugs need the negative polarity at the center electrode, so it is important to connect the coil so that it reflects the markings on the top. Here is a more detailed description: http://www.mossmotoring.com/coil-polarity/ Tom
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