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12-10-2023, 05:34 PM | #1 |
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Location: Washington Cty., ME or Flagler Cty., FL
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Changing the Ignition Coil
I should have paid attention to the connections on the coil before I took it off the car. The old and new coils do not have the spot welded bracket.
The coil is screwed tightly to the bracket. The new coil is marked Positive (+) and Negative (-). Which terminal on the coil should the red wire coming from the ignition switch out of the terminal box be connected to on the coil? Thanks for your help, Ed |
12-10-2023, 06:01 PM | #2 |
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Re: Changing the Ignition Coil
Ed, if your car is a 6 volt, positive + ground at the battery to frame connection, then the red wire to the switch and on to the points is attached to the + positive side of the coil.
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12-10-2023, 06:12 PM | #3 |
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Re: Changing the Ignition Coil
There is a tool available to make sure you have the polarity right. See https://www.snydersantiqueauto.com/p...6303&cat=41753. Snyders is out of stock today. Check with the other vendors.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
12-10-2023, 06:22 PM | #4 |
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Re: Changing the Ignition Coil
As was said above, if car is stock + to distributor.
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12-10-2023, 06:28 PM | #5 |
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Re: Changing the Ignition Coil
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12-11-2023, 07:01 AM | #6 |
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Re: Changing the Ignition Coil
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Lightening works the same way. You have probably seen this. Once the air is ionized multiple discharges of the static electricity can occur, causing multiple flashes along the same path as the initial discharge.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
12-11-2023, 08:51 AM | #7 |
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Location: Washington Cty., ME or Flagler Cty., FL
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Re: Changing the Ignition Coil
Thank you for your answers, Ed
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12-11-2023, 10:04 AM | #8 |
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Re: Changing the Ignition Coil
You can check your coil polarity with a analog volt meter.
1. Connect the negative lead to the coil secondary terminal and the positive lead to the engine block. 2. Set the meter on the highest volt range (these connections are the same whether you have a positive ground or negative ground electrical system). 3. Crank the engine over (do not start it) and the needle of the voltmeter should show an upward swing to the plus or positive side (don’t worry about taking a reading). 4. If the needle swings down to the negative side and gives a negative reading, your coil is hooked up backward. To correct the polarity, simply reverse the coil primary leads. Last edited by Y-Blockhead; 12-11-2023 at 10:17 AM. |
12-11-2023, 12:28 PM | #9 |
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Re: Changing the Ignition Coil
This slide may help you.
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12-14-2023, 03:37 PM | #10 |
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Re: Changing the Ignition Coil
Here is a pretty good article - https://mossmotoring.com/coil-polarity/
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12-16-2023, 07:59 AM | #11 |
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Re: Changing the Ignition Coil
I just got a Pertronix 1.5 ohm epoxy filled coil. Before installing it on my '31 pickup, I made a short video testing it on my vintage Herbrand coil tester.
https://youtu.be/TfK88Jt3DrQ?si=XeTLjVWjrHHMe3LT |
12-16-2023, 08:16 AM | #12 |
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Re: Changing the Ignition Coil
Maybe more info: https://www.chicagolandmgclub.com/te...neral/574.html
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12-17-2023, 10:34 PM | #13 | |
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Re: Changing the Ignition Coil
Quote:
They will work either way but this is most efficient. For lightning, the leader bolt comes down and ionizes the path, The main bolt /charge goes up. |
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