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Thread: New Holley EFI Terminator on Ford FE 390.

  1. #1

    Default New Holley EFI Terminator on Ford FE 390.

    Hi there. I purchased a Holley EFI system (Terminator 4BBL) to go on my '63 Ford Thunderbird. I've wired up a Holley HP EFI in a previous car and that all worked, so I have some experience with it. This is the second car I want to convert. The car currently runs a MSD 8595 Ready-To-Run distributor. It's wired with a 6AL ignition box:
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    This distributor has a gray wire that provides a 12 volt square wave, 20° duty cycle tachometer signal. I'd like the ECU to control ignition timing. Unfortunately, I cannot find any conclusive information with respect to the following solution:
    1) Run the gray tachometer signal from the MSD 8595 straight into the EFI system using the ignition adapter "271R1012A REL 11125".
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    2) Disconnect the orange wire from the MSD 8595 that's currently connected with the white wire from the 6AL ignition box, leave that orange wire disconnected.
    3) Connect that white wire from the 6AL ignition box with the loose white wire in the main harness of the Terminator EFI

    Is this all I need to do wiring-wise to get the ECU to control timing? Really appreciate your time for reading through this - Thank you!

    P.S. I've read through this post. Fantastic read. It'd be really awesome if somebody could leave a message here that covers my particular application! Love Holley EFI! It totally transformed my truck and I'll never drive a carburetor again. First things first, swap in a Holley EFI!
    Last edited by 3R1SC; 05-15-2021 at 08:41 AM.

  2. #2


    Hey there, anyone who is familiar with this? Thanks, SB
    Bump! Got to be somebody here who can help with a hint!
    20 Euro per PayPal if somebody can resolve this!

  3. #3


    Not sure how you need to wire yours up, but when I did my Dual Sync setup, my HP ECU harness didn't have the white wire as it was an early setup. I had to pin that in. Here's a link Danny posted: Cheers

  4. #4


    I have the white wire in the harness, thanks for the reply. But the distributor setup and wiring of the Hall-Effect sensor? Does that work?

  5. #5
    Join Date
    Dec 2009


    The Hall-Effect crank & cam sensors are wired as shown in the Holley EFI Wiring Manual: (Holley EFI Wiring Manual - Figure 11/12, Page 20/21) (Crank & Cam Sensor Setup) (Crank Reference Angle Importance) (Ignition Timing Synchronization)
    CNP/COP/DIS & single coil/distributor ignition synchronization verification & troubleshooting information at the end of post #1.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, R134a A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

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