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Thread: Commander 950 in a sand rail with Northstar.

  1. #1

    Default Commander 950 in a sand rail with Northstar.

    Hi guys. I have an old Commander 950 in a sand rail, with a 1995-1996 Northstar Vin 9, L37, 300 HP out of a Deville, Eldorado, Seville. I have a stock engine harness integrated into the 950 harness using all stock plugs. I'm using all factory ignition. The only modification is open headers, big K&N & fuel pump. It was running fine, but during a wiring upgrade I lost some wires. I need a couple wires.
    1: I need the Tach signal wire.
    2: Also I put in a override on the fan, but then I realized after putting the override in it wouldn't kick the fans on at all. I figure I would need to put a diode in to circuit to stop the current back flow. But I think I want to go back to my factory setting and get rid or my manual fan switch. Can you let me know what wire runs the fan signal. Thanks, Virgil

  2. #2
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    Quote Originally Posted by hybridtoys View Post
    1: I need the Tach signal wire.
    The C950 doesn't have a tachometer wire, it's wired into the ignition system.
    How it's done, depends on if there's a CD ignition box or just a single coil.
    http://documents.holley.com/199r10149-7.pdf (C950 Manual - Appendix 10, Wiring Diagrams)

    2: Can you let me know what wire runs the fan signal.
    It's Output 2, ECU terminal C1. Here's the C950 cooling fan relay wiring LINK.
    http://documents.holley.com/199r10149-7.pdf (C950 Manual - Input/Output, Page 81 & 82)
    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. #3

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    There are 4 coils each with two plug wires, this is a waste-spark system. It's totally stock like it's sitting in the original car. The tach is a 5 inch Auto Meter and worked, but then stopped working. I assumed it was because if a connection issue, and during the rewire I couldn't seem to find the tach signal again. There is a red, or dark orange wire that seems to be it, and has a weak ground signal like it should, but the tach doesn't move while running. I picked up a new tach just to make sure it's not something simple like that. But any other insight would be great.

    Also, I took the jump wire off the (yellow, with black tripe) going to the fan relay, but it doesn't seem to be sending a signal to turn on the fans to the relays. I have it wired to send +12V power to the relays. Does this sound correct?

    I don't have the wire connection kit to hook it up to my computer to verify the on/off temps, any thoughts on how to verify?

  4. #4
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    Quote Originally Posted by hybridtoys View Post
    Also, I took the jump wire off the (yellow, with black tripe) going to the fan relay, but it doesn't seem to be sending a signal to turn on the fans to the relays. I have it wired to send +12V power to the relays. Does this sound correct?
    It's Output 2, ECU terminal C1. Here's the C950 cooling fan relay wiring LINK.
    http://documents.holley.com/199r10149-7.pdf (C950 Manual - Input/Output, Page 81 & 82)
    Output 2 (ECU terminal C1) supplies a Ground signal to the cooling fan relay. Click & read the links!

    I don't have the wire connection kit to hook it up to my computer to verify the on/off temps, any thoughts on how to verify?
    Stop what you're doing, and purchase the data communication cable: LINK. You will need it to program & tune the EFI system.
    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.

  5. #5

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    Everything else is fine, the only thing that didn't work was the tach. The fans kicked on when I got it, but I put in an override, and then they stopped working.
    The tach just kinda sputtered out, but it runs great otherwise.

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