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Thread: Where to install engine run-on diode?

  1. #1
    Join Date
    Sep 2020
    Location
    Southern Ontario
    Posts
    8

    Default Where to install engine run-on diode?

    Hello everyone. I've got a 1972 Olds Cutlass Supreme. I've installed an MSD 6 Plus controller in the car along with MSD distributor and Blaster HVC coil. (Model numbers are in my other posts.) The question I have is where do I install the diode for engine run-on. The instructions say two things. 1) Install on alternator wire, or 2) Install it on the voltage regulator. I have both, a 2-wire alternator and a voltage regulator. So where do I put it? Any help would be greatly appreciated. Thank you.
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  2. #2
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,763

    Default

    Put it where it works. Try one or both to see what gets the job done.

  3. #3
    Join Date
    Sep 2020
    Location
    Southern Ontario
    Posts
    8

    Default

    Thanks a lot. I was going to resort to that method to be honest, but I was trying to save time by asking. Much appreciated.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,738

    Default

    Quote Originally Posted by Elite Carpentry View Post
    The instructions say two things. 1) Install on alternator wire, or 2) Install it on the voltage regulator. I have both, a 2-wire alternator and a voltage regulator. So where do I put it?
    You misunderstood the MSD wiring diagram. Think of it this way. There's only one charging lamp indicator wire ("To Charge Light" in MSD instructions). Splice the MSD diode on that wire as shown in the instructions.
    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 T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, 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, -6AN fuel system plumbing, Walbro 255 LPH pump, 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 M/T Street Comp tires.

  5. #5
    Join Date
    Sep 2020
    Location
    Southern Ontario
    Posts
    8

    Default

    Thanks Danny. I'll have to go back and check the chassis electrical diagram and find that wire. Thanks a lot.

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