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Thread: Main Harness Question for 550-937F

  1. #1

    Default Main Harness Question for 550-937F

    I pulled my main harness through today and started to lay out the harness in the engine bay. The issue I have is that the harness breakouts for the Holley connectors to the fuel pressure sensor and the oil pressure sensor appear to be reversed. Right after the CTS breakout is the oil pressure connector and after the IAT there is the breakout for the fuel pressure connector. All of the wire color coding checks out so there's definitely a problem with the basic layout of the harness, and the IAT breakout is on the short side also, it needs to be at least 6" longer. Do I have the wrong harness?

  2. #2
    Join Date
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    Connecticut
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    Contact Holley Tech Service (LINK).
    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, 232°-244° duration/.623" lift/114° LSA camshaft, 11.8:1 comp, TFS R-Series FTI ported intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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/3000 RPM converter, 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 MT tires.

  3. #3

    Default

    Thanks Danny. I did that and didn't get help other than that's the way they're made. Isn't this a Fox specific setup? Short of crossing the two leads in the front of the engine what are my options? Also, the IAT lead length needs attention regardless. Regards.

  4. #4
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    Connecticut
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    I'm not aware of this issue, nor am I involved with the design of the harness. I have the Dominator EFI and the main harness fit fine. This is how I installed it: https://forums.holley.com/showthread...464#post100464 (Related Fox Mustang/Holley EFI Forum Post)
    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, 232°-244° duration/.623" lift/114° LSA camshaft, 11.8:1 comp, TFS R-Series FTI ported intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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/3000 RPM converter, 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 MT tires.

  5. #5

    Default

    Thanks again, your writeup is outstanding and I learned a lot. Is it a sticky on other forums?

  6. #6
    Join Date
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    Location
    Connecticut
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    You're welcome, and thanks for the compliment. It's not currently a "sticky" on any Holley EFI forum, although it's been requested before. I suppose I'll "sticky" it in the Holley EFI Tech Articles forum (LINK).
    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, 232°-244° duration/.623" lift/114° LSA camshaft, 11.8:1 comp, TFS R-Series FTI ported intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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/3000 RPM converter, 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 MT tires.

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