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Thread: Sticky for updated or linked file database?

  1. #1

    Default Sticky for updated or linked file database?

    I'm on my third successful Terminator EFI install. Nowhere in the basic instructions does it point to the Pin Mapping needed to use the included I/O wiring. Also why doesn't the instructions include the pin-out of the ECU? I have to Google for all these items and dig up old threads with bad links. I have in time found out all the info, but seems wise on Holley's side to help the customer out with this. I have set up three engines with Holley Dual Sync distributors and the info to wire it correctly with a MSD 6AL box is on another site. I've spent over an hour on hold to verify info. I'm trying to get people to buy these EFI systems because they have so much potential, but the instructions and info is scattered everywhere. @DannyCabral

    I/O Pin Mapping AND color codes for wires for the HP EFI unit. Basic Holley Dual Sync instructions with MSD Pin-Out diagram:
    This has the basic info, but has outdated info. Still on V2 V3 firmware updating. No mention the 3.5" TSLCD screen will still say V4 after upgrading firmware to V5.
    This is outdated and to someone looking for "Terminator" related info looks like an incorrect linked file. Not to mention the page 20 Fig11, Hall-Effect sensor section should state this is similar to the Dual Sync distributor:
    This should also include the wire color pin numbers for the included I/O cable to control fans and A/C.

    Pin-out for Holley Terminator with I/O plug 3-pin Metri-Pack 150 connector 12110293? Needs to be verified: Page 68,
    B10 Grey/black Fan#1 Trigger Connector J1 Output #3
    B3 Grey/green Fan #2 Trigger Connector J1 Output #4
    B12 Grey/yellow A/C Shutdown trigger Connector J1 Output#1
    *NOTE* must be assigned in V5 software in Pin Map.

    Holley Terminator harness 558-100 diagram with colors is 271R961A Holley EFI 4BBL Harness Page 33 Figure 20:
    Hope this helps others!

    Delphi- Aptiv factory connector catalog for reference:
    Last edited by GriffithMetal; 07-25-2020 at 04:13 PM.

  2. #2


    IG @projectgattago
    I offer remote Holley EFI tuning.
    I deliver what EFI promises.
    Please get in touch if I can be of service.

  3. #3


    Thanks. That's what I came up with also. Seems most info for the Terminator is in the general forum.

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