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Thread: Holley Dual Sync Wiring

  1. #1
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    Default Holley Dual Sync Wiring

    Before you flail my butt, I've searched this forum on how to wire (not install) the Holley Dual Sync Distributor on the chassis. I've read & looked at Figure 11 on Page 20 of the Wiring Manual and know it's pretty close, but not complete. Before I dive into my newly wired chassis, I'd like some verification on the attached diagram. Sometimes two or more eyes are better. This is going in my Terminator EFI system and my "white" loose wire is really "yellow". I've added that along with the red/white powered key-on wire. Using a MSD 6AL-2 CD Ignition. OK, flail away.
    If you can't view this let me know: https://www.dropbox.com/s/pzqliy4f4i...nator.png?dl=0

    EDIT: I put the file in Dropbox and corrected wiring diagram. Note: I'm currently running a MSD Ready-To-Run distributor, and will be installing the Holley Dual Sync distributor.
    Last edited by weendoggy; 02-03-2018 at 02:41 PM.

  2. #2
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    The Holley Dual Sync Distributor should be "plug & play" into your Terminator EFI ignition connector on the main harness.

    The Hall-Effect crank & cam sensors are wired as shown in the Holley EFI Wiring Manual:
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Figure 11/12, Page 20/21)

    The MSD CD ignition box is wired as shown in the Holley EFI Wiring Manual:
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Figure 11, Page 20)
    https://www.youtube.com/watch?v=AM7r-DauCak (Holley EFI Dual Sync Distributor - YouTube Tech Video)

    FYI: Holley EFI now sells their own Dual Sync Hall-Effect distributors (LINK).
    They're a small cap design, "plug & play" with Holley EFI, and no need for a modified Firing Order.
    The crank & cam sensor signals also provide sequential injection capability (MPFI applications).
    It's "plug & play" (into the 10-pin ignition connector on the EFI Main Harness) and requires a CD
    ignition box (Instructions). The MSD 6201 Digital 6A CDI box & 8253 HVC-2 coil are a great match.
    The MSD CD ignition box is wired as shown in the Holley EFI Wiring Manual:
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Figure 11, Page 20)
    https://www.youtube.com/watch?v=AM7r-DauCak (Holley EFI Dual Sync Distributor - YouTube Tech Video)
    A blank cap (LINK) is available, if the user decides to convert to Coil-Near-Plug/DIS later (no CDI box).
    Of course, this component can also be used as a crank and/or cam sync/oil pump drive unit.

    The Custom Ignition Parameters (in System Parameters) for the Holley EFI Dual Sync Distributor:
    Ignition Type ............. ― "Custom"
    Crank Sensor Type ..... ― "1 Pulse/Fire"
    Sensor Type .............. ― "Digital Falling"
    Inductive Delay .......... ― "100.0 usec" ( Synchronization info, adjusted per application.)
    Ignition Reference Angle ― "50°" ( Inherent rotor-phasing of this unit.)
    Cam Sensor Type ........ ― "Single Pulse" ( "Not Used" for TBI, unless CNP ignition.)
    Sensor Type .............. ― "Digital Falling"
    Output Setup Type ..... ― "Points Output" ( CDI box ground trigger.)
    Dwell Time ................. ― "2.0 msec" ( Do not set this to 1.5 msec!)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  3. #3
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    Danny, I understand the Holley Dual Sync Distributor is "plug-n-play" for my harness. I'm also aware and have read both of the wiring documents mentioned. The Holley video is good, but doesn't deal with wiring (I've watched that several times) in the past. My simple concern is the CD box diagram you mention. Yes, it has a "white" wire from the CD box, but it also says to connect to the loose "white" wire in the Holley main harness. If that wire is coming from Pin A1 on P1A (coil in), mine is "yellow" as noted on my diagram (moved to Dropbox). I just want to make sure of connections, so I don't fry several hundreds of dollars. Thanks.

  4. #4
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    Quote Originally Posted by weendoggy View Post
    My simple concern is the CD box diagram you mention. Yes, it has a "white" wire from the CD box, but it also says to connect to the loose "white" wire in the Holley main harness.
    Yes, the loose "Points Output" white wire always triggers the CD ignition box.

    If that wire is coming from Pin A1 on P1A (coil in), mine is "yellow" as noted on my diagram (moved to Dropbox).
    That's the wrong wire! Nowhere does it refer to the yellow "Coil In" wire at pin A1 on the J1A ECU connector.
    The correct wire, is the loose "Points Output" white wire off the main harness, which connects to pin A6 on the J1A ECU connector.
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Section 6.0 "Loose Wires", Page 11)
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Section 2.1 "Pin-Outs", Page 6)
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Section 13.0 "Wiring Appendix", Page 31)
    https://forums.holley.com/showthread...ts-Output-Wire (Terminator EFI "Points Output" Wire Information - Read This!)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  5. #5
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    Ah ha! We have confirmation. I don't have the white wire on A6 of P1A, so I'll be adding that (along with Oil Pressure A20) in, and then install the distributor. The last "thread" explained it all. My Terminator EFI system is three years old. Thanks.
    I've also updated my document to reflect this information for others:
    Quote Originally Posted by Danny Cabral
    The early Terminator EFI wiring harnesses didn't have the loose Points Output white wire. It does now.
    If yours doesn't have it, you'll have to add it into the main harness (cavity A6-P1A ECU Connector).
    The loose Points Output white wire isn't on the Holley Dual Sync Distributor, it's on the Main Harness.
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - "13.0 Wiring Appendix", Page 31)
    http://forums.holley.com/showthread....7509#post77509 (Alternative Points Output/White Wire Method - Posts #18-#21)
    Last edited by weendoggy; 02-03-2018 at 03:56 PM.

  6. #6
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    You're welcome, I'm glad we got to the bottom of this.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  7. #7

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    Surprised that didn't turn up in a search. I had to add that same wire when I installed the Holley dual sync distributor a couple years ago. Rather than run a new wire I moved the yellow wire, which is a little smaller gauge, but Holley tech confirmed it would be fine, and it has been.

  8. #8
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    http://forums.holley.com/showthread....7509#post77509 (Alternative Points Output/White Wire Method - Posts #18-#21)
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - "13.0 Wiring Appendix", Page 31)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 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 tires.

  9. #9
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    Quote Originally Posted by JWMcCrary View Post
    Surprised that didn't turn up in a search. I had to add that same wire when I installed the Holley dual sync distributor a couple years ago. Rather than run a new wire I moved the yellow wire, which is a little smaller gauge, but Holley tech confirmed it would be fine, and it has been.
    I guess I didn't search hard enough. Thought I found information, but not enough. Just to make it even better, I call Holley to find out "why" the purple wire for Cam Input Signal (A22) is beige/black, even though the wiring diagram for my Terminator shows it as purple. Well, he (Woody) informed me that Terminators are beige/black and all others are purple. I haven't traced this out just yet, but I will before finalizing my wiring.

    Note: the wiring diagram in EFI Wiring Manual 13.0, Page 31, shows A22 as purple. As I stated above, Holley says the Terminator harness is beige/black (all others are purple). That diagram could confuse some Terminator owners.
    Last edited by weendoggy; 02-23-2018 at 09:07 AM.

  10. #10
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    Finally finished the Dual Sync install on my Terminator. I did add the white wire to A6 and also a gray wire A20 for oil pressure transducer as well as tied into the respective sensor signal and ground. I also moved the 12V signal from B20 for the CAN to the 12V signal (ignition) wire A10, and the ground B14 to the chassis ground. I then added a red/white from B20 to my ignition plug for a clean signal. I verified the beige/black wire from A22 to the ignition plug and all is good.

    Installation of the distributor wasn't bad. Located #1 compression, picked my terminal spot, engine to 50° BTDC, positioned the rotor to the black tab, checked LED operation and went though the setup. Fired right up. My only snag was my timing light needing to have more revs for some reason to work. It just won't register at cranking. Other than that, not bad. Glad I returned the 1st generation distributor and got the 2nd generation. Much nicer unit, IMO.

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