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Thread: Running existing electric fan with the 950

  1. #1
    MTCK Guest

    Default Running existing electric fan with the 950

    I've got an existing electric fan that is already wired with a relay and I have just installed the 700cfm TBI commander 950 system on my truck. I was wondering if I could tap into position C1 on the wiring harness and use my existing wiring and relay to let the C950 control the fan. Does that pin send 12v + when the computer calls for the fan? Also are there adjustable on and off temp settings?

    Thanks in advance.


  2. #2
    Join Date
    Dec 2009


    Yes, wire it according to this diagram:

    The electric fan on-off settings are in the Input/Output screen (Output 2-C1), under Hdwr Settings.
    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
    MTCK Guest


    Thanks, Danny. I'm sure this is just the beginning of my questions.


  4. #4
    MTCK Guest


    Works like a champ - thank you. The one problem I had is I was looking for the C950 to provide 12v+ to the relay, when in fact it gives ground. The multimeter figured that out after a few minutes and it works flawlessly now. Thanks again.


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