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Thread: Questions about installing GM HEI Distributor

  1. #1
    Join Date
    Feb 2014
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    Northern Ohio
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    Default Questions about installing GM HEI Distributor

    Hi, I've been running my Terminator EFI system without timing control since installing back in 2014 and decided to take the leap into having timing control setup done. I have the parts to make the switch, but before I get to far into this I've been reading all of the posts concerning doing this. Should I bring my old distributor up to TDC before pulling? The optional harness for the small cap HEI, 558-304 from Holley, has the coil to distributor harness included, but I'm a little confused as the diagram in option 3 of the install manual shows the white and red wire going to the coil, but the harness only has the white wire loose, the red is pinned into main connector for the main wire harness. Do I not have to worry about the red wire shown in diagram going to the coil. Do I only connect the white? Is the red wire getting it's power from the main harness? Do I still hook my factory tach to the negative side of the coil and since there are two plugs on the coil, which plug do I tap into or does it matter? I know I will have more questions as I go and I hope you bear with me as try & learn. Thanks in advance for any input and advice.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
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    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, BBK 80mm TB, 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, B&M Hammer shifter, 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
    Join Date
    Feb 2014
    Location
    Northern Ohio
    Posts
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    Default

    Thank you Danny. Page 12 showing the option 3 wiring, shows what I was concerned about, my manual is different so this one is the most current diagram. So, I figure I'll be tapping into the white wire to hook my factory tach and shift light that I use, so that's good. I have the factory coil connectors that I bought from RockAuto and they came with pigtails so all I need to do is hook to the pigtails for my connections. I have my old distributor at TDC, so all I need to do is drop the new distributor in place, once I figure what direction the distributor plugs need to face to hook the coil up once I figure where I mount the coil. Thanks again, you're a wealth of knowledge and May God Bless you as well.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
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    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, 232°-244° duration/.623" lift/114° LSA camshaft, 11.8:1 comp, TFS R-Series FTI ported intake, BBK 80mm TB, 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, B&M Hammer shifter, 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
    Join Date
    Feb 2014
    Location
    Northern Ohio
    Posts
    29

    Default

    Hi Danny, have one more question for you concerning coil wire plugs. I have both new connectors with pigtails for the coil and I see that the one plug has the heavy gauge pink wire which would hook for the +12V ignition source in option 3 of the installation manual. I thought I saw in that other post that another member asked if it made any difference which + wire plug to use and I think you said the plugs probably connected as one inside the coil, which to me makes sense since other style coils have just one + and one - to hook wires to. The reason for my asking is that the diagram on page 12, option 3 shows the coil plug wire tower connection for the distributor is at the top with coil plug connectors are on the bottom, but I would be installing coil with coil plug wire tower facing opposite of what the diagram shows, that's the reason for my question. Otherwise, I'm getting close, just have to make my coil bracket to hold the coil which will be mounted to the firewall close to the distributor. Again thanks for your time and help, much appreciated.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    24,252

    Default

    I don't know which "installation manual", or "page 12", or "option 3", or "other thread" you're referring to.
    See the Holley EFI Wiring Manual below: http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Figure 3 & 4, Page 13)
    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, BBK 80mm TB, 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, B&M Hammer shifter, 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.

  7. #7
    Join Date
    Feb 2014
    Location
    Northern Ohio
    Posts
    29

    Default

    I have two different full versions of the installation manual for the system. The original when I bought the Terminator system back in 2014 and then the next version when I bought the 3.5" touchscreen late in 2015. There was some differences when it came to the wiring schematics of the GM small cap HEI, and then when I went to the Holley website and looked at the current version of the install manual, I found that wiring diagrams for the GM distributor had a clearer/better diagram which helped me get the wiring correctly done. I finished it up and car is a completely different car now. It started right up, I synced the timing to the ECU, set my idle and that's been it, it runs the best it ever has, starts right up, idles down, and runs better every time I start it and run it. I didn't do anything, but use the 3.5" touchscreen with the mildest tune and I'm letting it Learn as I go, but I'm thoroughly impressed, I guess I should of done it back when I installed this system back in 2014. Anyway, sorry if I asked a lot stupid questions but I really just wanted to understand how properly install and set this up. Now I can hopefully enjoy the car as I have not been able to before due to continued issues only using the Terminator for fuel only and not timing. Thanks for putting up with me and my questions. I've always said that the only stupid question is the one you don't ask. Again, thanks.

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