Ford EFI wiring confusion TFI Coil - FPM - Vintage Mustang Forums
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post #1 of 11 (permalink) Old 07-15-2019, 02:58 AM Thread Starter
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Ford EFI wiring confusion TFI Coil - FPM

Hello VMF,

I’m installing a stock 5.0HO/AOD into my ‘67. Somewhere along the way I’ve acquired an aftermarket harness, it’s from Hypertech and looks like it was intended for a SD to MAF conversion. It’s nice and tidy and mostly useable.

I had to move the injectors to the 5.0 HO firing order and am splicing in the MAF harness.

I’m trying to finish tracing down all the wires/connectors and need some help figuring a few things out to wrap this up.

Referencing TMOSS’ wiring diagram:
http://www.veryuseful.com/mustang/te...ng_Diagram.gif

TFI connector port 4
I cannot find the other end of the red/ green run wire in the TFI connector. What should I be looking for? I’ve run a continuity test to all points in the 60 pin connector and the other connectors in the harness, nothing rang out. Maybe there is a resistor inline messing me up?

Coil Connector (not in diagram)
I can’t trace the Green/Yellow wire either. Where should I be looking?

Fuel Pump Monitor
This harness doesn’t have a wire going to in 19 for FPM. Should I add this wire in?

Any help is much appreciated.
I will create a second post regarding the relays.

Last edited by DonP; 07-15-2019 at 02:58 AM. Reason: formatting
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post #2 of 11 (permalink) Old 07-15-2019, 03:43 AM Thread Starter
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Ford EFI wiring confusion EEC Relay

Hello VMF,

I’m installing a stock 5.0HO/AOD into my ‘67. I’m using an aftermarket harness, it looks like it’s from Hypertech and was intended for a SD to MAF conversion. It’s nice and tidy and mostly useable.

Referencing TMOSS’ wiring diagram the relays are mostly wired correctly, I think.
http://www.veryuseful.com/mustang/te...ng_Diagram.gif

If I’m reading the diagram correctly and all the other wires are connected properly, that one red wire with the black heat shrink should be going to GROUND. But it doesn’t.
Instead, The red wire in the coil connector is spliced, it goes to this red wire with black heat shrink there’s a resistor in line, the other end goes to a fuse box with a 15 AMP fuse.
The resistance measures 0.123 with the multi-meter set a 2M

What I want to do is remove this wire from the relay and run a new wire to the 40/60 ground wires. Is that what needs to be done?

Are these even the correct relays?

Any help is much appreciated.
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post #3 of 11 (permalink) Old 07-15-2019, 06:34 AM
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Red with the long heat shrink attached should be ignition on and the black is ground from what I can determine. The EEC power relay puts power on all the red wires in your diagram as well as power to the fuel pump relay coil control thats grounded (by pin 22 your brown wire) upon initial key on for a second or when the ECM see's crankshaft sensor's revolution input.

1969 Mach 1 S code...2nd owner
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post #4 of 11 (permalink) Old 07-15-2019, 06:57 AM
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Green/yellow in your diagram should have a tie point going to the negative side of the Ignition coil coming from the TFI module. You need another diagram to read. What year is harness. Im seeing early and late EEC systems possibly being mixed in your project.

1969 Mach 1 S code...2nd owner
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post #5 of 11 (permalink) Old 07-15-2019, 01:02 PM
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The red/grn wire on the TFI goes to your ignition switch run side.

'68 coupe 289 C4 (featured in Mustangs & Fords July 2003)
'67 convertible 5.0L EFI conversion (appeared in Mustang Monthly Feb 2017)
'90 LX 5.0L
Www.ccrestorations.com
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post #6 of 11 (permalink) Old 07-15-2019, 05:53 PM Thread Starter
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Quote:
Originally Posted by gordonr View Post
Red with the long heat shrink attached should be ignition on and the black is ground from what I can determine. The EEC power relay puts power on all the red wires in your diagram as well as power to the fuel pump relay coil control thats grounded (by pin 22 your brown wire) upon initial key on for a second or when the ECM see's crankshaft sensor's revolution input.

Thanks I think that makes sense.

The black wire goes to a ring connector. I thought that went to the ign switch, but it is the ground.


Now this Red wire with heat shrink also goes to the coil connector and has a resistor in line.

Should I leave that as is?
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post #7 of 11 (permalink) Old 07-15-2019, 07:48 PM Thread Starter
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It's an 87 speed density harness that I'm adapting to MAF.


I think I've got this straight:
TFI red/green ties to the coil connector and the ignition run circuit
TFI green/yellow ties to the coil connector and EEC pin 4


And I will go ahead and run a wire to EEC pin 19 for the Fuel Pressure Monitor.


Thank you both for your help.
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post #8 of 11 (permalink) Old 07-15-2019, 09:07 PM
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There should be no resistor.

1969 Mach 1 S code...2nd owner
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post #9 of 11 (permalink) Old 07-15-2019, 09:31 PM
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Quote:
Originally Posted by DonP View Post
It's an 87 speed density harness that I'm adapting to MAF.


I think I've got this straight:
TFI red/green ties to the coil connector and the ignition run circuit
TFI green/yellow ties to the coil connector and EEC pin 4


And I will go ahead and run a wire to EEC pin 19 for the Fuel Pressure Monitor.


Thank you both for your help.

That 22k resistor needs to stay in place between the coil negative and pin 4 at the ECM though. It keeps out the high inductive kick that the ECM wasn't designed to handle from the ignition coil.
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1969 Mach 1 S code...2nd owner
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post #10 of 11 (permalink) Old 07-16-2019, 01:17 AM Thread Starter
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Quote:
Originally Posted by gordonr View Post
There should be no resistor.



Thanks. I'll go ahead and replace that section with a new wire.
I also noticed that same circuit connects to the red/green Ignition Run wire in the TFI connector (4th port)
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post #11 of 11 (permalink) Old 07-16-2019, 07:00 AM
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Yes Red/green (ignition on power) is going to feed the TFI module for turn on. Insure the Red/Lt Blue starter/crank power is attached too. As I mentioned that diagram is lacking. Find another one that's either a Mitchell redraw or an Oem diagram. That diagram's focus is the on ECM's wiring not on the primary chassis wiring attachments to the system. Good luck on your project!

1969 Mach 1 S code...2nd owner
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