Mustang TFI Dedicated Ground?

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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amrcnv8
MegaSquirt Newbie
Posts: 14
Joined: Thu Oct 14, 2010 7:48 pm

Mustang TFI Dedicated Ground?

Post by amrcnv8 »

For a 91 5.0 Mustang with TFI w/ MSD 6A and MS2 V3, should I run the 'dedicated ground TFI' wire from the EECIV harness to the #2 pin on the MS2 wiring harness? Or is this not needed since the MSD is grounded?
91 5.0 Mustang, TFI w/ MSD 6A, MS2 V3, LC-1, Custom twin Garrett T3s
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: Mustang TFI Dedicated Ground?

Post by Matt Cramer »

That would work; I believe this is a logical ground wire and grounding it to the MS should make for a clearer signal.
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amrcnv8
MegaSquirt Newbie
Posts: 14
Joined: Thu Oct 14, 2010 7:48 pm

Re: Mustang TFI Dedicated Ground?

Post by amrcnv8 »

Matt Cramer wrote:That would work; I believe this is a logical ground wire and grounding it to the MS should make for a clearer signal.
Thanks for the quick response. You've been very helpful.
91 5.0 Mustang, TFI w/ MSD 6A, MS2 V3, LC-1, Custom twin Garrett T3s
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my0wn3ds
Helpful Squirter
Posts: 37
Joined: Fri Dec 03, 2010 4:10 am

Re: Mustang TFI Dedicated Ground?

Post by my0wn3ds »

I have the same question.
1987 Ford 302 with Procomp CDI, MS-II v3.0.

What exactly wire I need to connect to the #2 pin on DB-37 connector?
is it ground on Ford TFI module?
94'Mustang 302 swap/4BBL, 87'Cougar XR-7 289 swap/turbo project
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Matt Cramer
Super Squirter
Posts: 2951
Joined: Sat Jul 03, 2004 11:35 am

Re: Mustang TFI Dedicated Ground?

Post by Matt Cramer »

Pin 2 is a ground that on our harness is simply used for the shield on the PIP signal. The other end isn't connected with TFI.
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my0wn3ds
Helpful Squirter
Posts: 37
Joined: Fri Dec 03, 2010 4:10 am

Re: Mustang TFI Dedicated Ground?

Post by my0wn3ds »

Matt Cramer

Thank you
94'Mustang 302 swap/4BBL, 87'Cougar XR-7 289 swap/turbo project
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