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Thread: Trying to figure out how to hook up 558-312/558-307.

  1. Default

    OK, so I had the chance to sit down with the information given to me and managed to draw out what I think is what I need to do. I attached it to this post.
    I just have a couple questions just to clear things up for me.
    1. 558-312: Pin C ground to cylinder head.
    Can I just cut it at the connector and ground to head and not connect it to 558-307 harness? This would allow me to keep the wire short & neat.

    2. 558-312: Pin D Ground to Battery/Stud.
    I have a 0 gauge welding cable ran from trunk mounted battery to a spot on the block. Would this be an acceptable spot to ground Pin D? Also allowing me to avoid connecting it to 558-307 harness plug, and keeping the wire short & neat.

    3. 558-312: Pin E connect to +12V switched source using 40 amp relay inline.
    Can I avoid plugging this in to 558-307 as well and, upgrade the wire size, and find a +12V switched source under my dash to wire it to? It's a 1984 Mustang and maybe you have a suggestion for +12V switched source before I go searching.

    If anything seems off let me know, but I think I got it. Fingers crossed.
    Attachment 2065

  2. #12
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,067

    Default

    Quote Originally Posted by Throw'n $$ away View Post
    1. 558-312: Pin C ground to cylinder head.
    Can I just cut it at the connector and ground to head and not connect it to 558-307 harness?
    Yes, you don't have to run that wire through the Holley 558-307 CNP Main Harness connector.

    2. 558-312: Pin D Ground to Battery/Stud.
    I have a 0 gauge welding cable ran from trunk mounted battery to a spot on the block. Would this be an acceptable spot to ground Pin D?
    Yes: http://documents.holley.com/199r10698rev1.pdf (Holley 558-312 CNP Coil Harness Instructions - See "Coil Connectors - Pins A-E", Page 2)

    3. 558-312: Pin E connect to +12V switched source using 40 amp relay inline.
    Can I avoid plugging this into 558-307 as well, and upgrade the wire size, and find a +12V switched source under my dash to wire it to?
    Yes: http://documents.holley.com/199r10515rev3.pdf (Holley 558-307 Main CNP Harness Instructions - See Wiring Diagrams "Relay +12V", Page 1 & 2)
    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.

  3. Default

    Thank you, thank you, thank you. Clears my head and makes it cleaner! You're the man!

  4. #14
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    23,067

    Default

    You're welcome.
    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.

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