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Old 12-31-2011, 02:59 AM   #11
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...and if you think about it the power/control plug was providing the ground and is probably not what you want.
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There are some coil types that need that core grounded. This is one of them.
No external grounding is required. The ECU controls the grounding.
You likely made better electrical contact with the coil pack connector or plug leads when removing/installing the coil pack and that cured whatever problem you were having.

blk/grn to ECU pin 52 switched ground /coil
blk/org to ECU pin 26 switched ground /coil
grn/blu to central junction box (power)

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Old 12-31-2011, 08:53 AM   #12
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No disrespect but... Is this actually a problem ? I have to agree the ground is through the ECU like many things on the Focus

But like and old Friend said many times "If it makes you feel better do it" Smoky Yunick

Tom
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Old 01-01-2012, 08:36 AM   #13
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Certainly!
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Old 01-05-2012, 02:38 PM   #14
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Confirmed you are correct Tom.
MSD tech support
There should be no correlation between the mounting bosses and the operation of the coil.

The coil is isolated from those bosses and there is no connection.

Paul
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Old 01-05-2012, 02:51 PM   #15
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But like and old Friend said many times "If it makes you feel better do it" Smoky Yunick

Tom

If that's true, "friend", then I see where much of what you do comes from and why it's all goofy [bootyshak.


btw, a 3/4 scale Focus would be neato ... hint hint
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Old 01-06-2012, 12:05 AM   #16
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You lost me on that one ????????????????

Tom
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Old 01-07-2012, 03:30 PM   #17
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I have the MSD coil on my zetec and it does not ground through the body of the coil.

But, no need to argue, do what you want.
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Old 07-25-2013, 12:42 PM   #18
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We ruined a race weekend because the pig-tail plug in came loose and broke the connection. We installed our used back up MSD and it's connector had a break too.
If your ignition harness connection at the coil wiggles the unit is probably shot.
On the grounding issue, just run a couple of wires from the mounting screws to the head.
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Old 07-25-2013, 12:44 PM   #19
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Confirmed you are correct Tom.
MSD tech support
There should be no correlation between the mounting bosses and the operation of the coil.

The coil is isolated from those bosses and there is no connection.

Paul
On the bottom of the coil are bare areas that appear to be for grounding?
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Old 07-25-2013, 07:46 PM   #20
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The MSD or any others for the FOCUS Zetec coils do not need to be grounded in any way

Agree stock coil is all you need , nothing out there out performs the stock coil and coil wires for that matter

Tom
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