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  • Harness Extensions

    Does anybody out there make an extension harness for: J1A, J1B, J3, J4? Tried searching but couldn't find any so maybe they don't?
    LS SWAPPED 66 MUSTANG

  • #2
    No, but it shouldn't be necessary if you mount the ECU in place of the OEM Ford ECU. I can provide a link for more detail if you'd like. (It's where I mounted my Dominator ECU, I don't like under the passenger seat.)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232-244 duration/.623" lift/114 LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, 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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    • #3
      I think my username is a little misleading. It's actually going into an LSx swapped '66 Mustang, so no ECU location.
      LS SWAPPED 66 MUSTANG

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      • #4
        OK, thanks for the clarification.
        May God's grace bless you in the Lord Jesus Christ.
        '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232-244 duration/.623" lift/114 LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio AOD, 3000 RPM C6 converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, 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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        • #5
          I built my own harness and mounted my ECU in the trunk, using a 15" Flying Lead Harness. https://www.holley.com/products/fuel.../parts/558-126. It was a little time consuming with all the soldering.

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          • #6
            In my '67 Cougar I mounted the ECU in the glovebox. I do not recommend extending any of your harness wires, especially the cam & crank sensor leads.

            If you position the big break out behind the intake, all of the engine connectors will reach nicely and you should have plenty of length to mount the ECU under the dash. Andrew
            Instagram: @projectgattago
            Offering remote Holley EFI tuning.
            I deliver what EFI promises.
            Please get in touch if I can be of service.

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            • #7
              I have not had any issues with the cam & crank sensors. The flying lead harness has the shielded wires for the cam & crank sensors for the entire 15' length.

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              • #8
                I went ahead and cut out a 2" hole behind the intake and mounted the ECU where the heater & A/C box used to be. Originally wanted to mount it in the trunk, will look into that in the future when I add A/C to the car.
                LS SWAPPED 66 MUSTANG

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                • #9
                  Earl's has a grommet for the 2 inch hole. It's a little expensive for what it is, but it would seal it.

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