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Thread: Terminator/Dual Sync Setup

  1. #11
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,064

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    Just wire the switched +12V red/white wire as instructed to a clean keyed +12V source.
    Also, ensure the Switched +12V red/white wire (pink wire - Sniper EFI) is powered in the "Run" and "Crank" key positions.
    The ignition switch must have a wire that's powered in "run" and "crank" key positions leading to the ignition system.
    The ignition switch can't start the engine, if there isn't a circuit that's powered in the "Run" and "Crank" key positions.
    The easiest way to find this wire, is to look at the wiring schematics in a factory shop manual or even a Haynes manual.
    https://www.msdperformance.com/suppo...s/#EngineRunOn (MSD Troubleshooting - Engine Run-On)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, 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.

  2. #12

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    The wire/wires that I've had it wired to (now three different sources) are clean 12V in on & crank and off without the engine running, but something must be backfeeding into that circuit with the engine running is my only guess. ItÂ’s a stock wired car with even the factory radio, so not sure what it could be, but there's definitely 6-8 volts there with the key off and the engine continues to run even with the handheld screen shut off (but flickers occasionally).

    I guess I should ask though. Is there anyway the ECU itself could be causing this, because it seems to be the only thing left in the circuit besides normal car stuff.

  3. #13

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    The stray voltage appears to be from the charging system as disconnecting either the regulator, or alternator makes the stray voltage disappear and the engine shuts down immediately. Not sure how or why, if anyone has any idea I’m open to suggestions. If not, I'll switch to a one wire system next weekend and that should solve any stray voltage problems.

  4. #14
    Join Date
    Oct 2016
    Location
    Buenos Aires, Argentina.
    Posts
    67

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    The MSD box needs a diode connected in the alternator port:
    "If your engine continues to run even when the ignition is turned Off you are experiencing engine Run-On. This usually only occurs on older vehicles with an external voltage regulator. Because the MSD receives power directly from the battery, it does not require much current to keep the unit energized. If you are experiencing run-on, it is due to a small amount of voltage going through the charging lamp indicator and feeding the small Red wire even if the key is turned off.

    Early Ford and GM: To solve the Run-On problem, a Diode is supplied with the MSD in the parts bag. By installing this Diode in-line of the wire that goes to the Charging indicator, the voltage is kept from entering the MSD. The diagram below shows the proper installation for early Ford and GM vehicles."


    Click image for larger version. 

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    1970 Dodge GTX - Small Block Mopar 418ci - HP EFI Terminator TBI

  5. #15

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    Excellent! I'll be doing that for sure. Who would've thought to read the instructions!?!?! I don't get lost either, I know where I'm going. Thanks! I'll let you know, but sure sounds like the fix.
    UPDATE: The diode did the trick, just like the instructions showed. Thanks for the help madmax2 & Danny. The ECU is Learning and the burnouts are getting longer.

  6. #16

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    Where did you find the diagram? I've looked without success. I have the Dual Sync & MSD 64253. My Terminator is a few years old and been sitting patiently while my build progressed. I'm just about ready to install the engine and wiring now. Does anyone have the adapter harness number for this 6AL? Thanks.

  7. #17
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,064

    Default

    See the link in post #11.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, 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.

  8. #18
    Join Date
    Feb 2017
    Location
    St Chuck, MO, USA
    Posts
    10

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    I found out the hard way that if you're going to use the Terminator EFI with a Dual Sync distributor & MSD box, you have to have a laptop. There's no option in the handheld to tell the ECU to trigger the MSD to fire. When you load the HEFI software to a laptop, it needs to update the ECU firmware to match so it can communicate. This firmware update overwrites the original firmware and you then have an HP system with none of the "plug & play" abilities advertised for the Terminator EFI.

    It seems like this would be an easy R&D firmware fix. Just add the spark box Points Output option to the menu in the handheld firmware, download the update on any computer to the SD card in the handheld and pop it back in, Ka-za!

    In my case, I installed the HEFI V4 software & firmware and wound up spending many, many hours learning way more than I originally bargained for about EFI, but I'm more smarter now because of it.
    "New" 1979 Trans Am, 400 Pontiac, Super T-10, Chassisworks front end, DSE Quadlink rear end, Wilwood 13in discs with Hydratech hyd brake booster, HP TBI EFI, HP Dual Sync, Comp Cams Hydraulic roller, MSD 6AL (6420) & Blaster 2, dual Spall 13" Elec fans, 150amp Alt, Compustar/DroneMobile alarm...and a lot of other new stuff I'm trying to get put together...

  9. #19

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    Quote Originally Posted by Mike67 View Post
    Where did you find the diagram? I've looked without success. I have the Dual Sync & MSD 64253. My Terminator is a few years old and been sitting patiently while my build progressed. I'm just about ready to install the engine and wiring now. Does anyone have the adapter harness number for this 6AL? Thanks.
    I'm sorry, but I do not see a link in post #11. I saw one in another post but it was for the HP/ Dominator install and the other link was just the Dual Sync instructions. It mentioned having to use a CDI, but nothing on the wiring. I also have a MSD 8546 Pro Billet that I can run off the DS is too difficult to install and setup. I'm just getting into this EGO thing. This is a 95% street car. Thanks for the help.

  10. #20

    Default

    Quote Originally Posted by Dan Morrison View Post
    I found out the hard way that if you're going to use the Terminator EFI with a Dual Sync distributor & MSD box, you have to have a laptop. There's no option in the handheld to tell the ECU to trigger the MSD to fire. When you load the HEFI software to a laptop, it needs to update the ECU firmware to match so it can communicate. This firmware update overwrites the original firmware and you then have an HP system with none of the "plug & play" abilities advertised for the Terminator EFI.
    It seems like this would be an easy R&D firmware fix. Just add the spark box Points Output option to the menu in the handheld firmware, download the update on any computer to the SD card in the handheld and pop it back in, Ka-za!
    In my case, I installed the HEFI V4 software & firmware and wound up spending many, many hours learning way more than I originally bargained for about EFI, but I'm more smarter now because of it.
    I just bought a Terminator Stealth, the dual-sync distributor, and the MSD 6EFI CD box. I plan on making sure they are all on the latest V5 firmware version and hopefully will be plug & play. The 6EFI box is specifically advertised as working with the EFI systems, so hopefully those options are in the handheld. Otherwise, I'll be using the USB cable. Which MSD CD box are you using, the 6EFI?
    http://www.TheFOAT.com/92GTA
    1969 Pontiac Firebird w/BP 461ci stroker kit, 670 heads & XE274H cam. Primer black w/black interior.
    1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.

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