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Thread: Where do I wire Output #2 to control fans?

  1. #1

    Default Where do I wire Output #2 to control fans?

    Hey everyone. I'd like to use Output #2 light green to control both of my electric fans. I'd like them to both come on at once. Which terminal on my relay am I wiring it to?
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  2. #2
    Join Date
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    https://forums.holley.com/showthread...8779#post98779 (Sniper EFI A/C IAC Kick, Electric Fan #1/#2 Wiring & A/C Shutdown Info)
    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

    Default

    I'm sorry, I'm confused. Forgive me but... My relay has the ground as #86 and fused 12V from the switch as #85. Am I wiring it to the fused 12V terminal? Or the ground?

  4. #4
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    From the link in post #2:
    The Sniper EFI electric fan ground wires (pin C, light blue - Fan #1 & pin D, light green - Fan #2) trigger the relay coil − (terminal #85). Yes, terminal #85/Ground is the industry standard for good quality relays, with or without a diode. Sniper EFI instruction manual: LINK - page 17 & 50.
    Electric Fan #1/#2 relay terminals (ECU ground signal scenario):
    #85 - Ground signal from ECU Output.
    #86 - Fused +12V power to relay coil.
    #30 - Fused +12V power to relay contact.
    #87 - +12V power to electric fan.
    #87A - Not used in this application.
    Terminals #30 & #87 can be reversed.
    http://www.autoshop101.com/forms/hweb2.pdf (Understanding Relays)
    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

    Default

    So light green/output #2 goes to both grounds on the fan relays? It simply allows the relay to ground itself, correct?

  6. #6
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    Yes, to relay terminals #85. See post #4.
    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.

  7. #7

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    Thanks for your patience! Relay terminal #85 on my relay is green (override circuit)/yellow from the 12V ignition source. That's what's confusing me. I've read those instructions literally 100 times, but it has #85 as ground and #86 as fused 12V. My relay has #86 as ground and #85 as a 12V fused from ignition switch. My relay seems backwards from those instructions? Does that make sense? They're Derale relays.

  8. #8
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    The main reason for the now industry standard as 85 for ground is if the relay has a diode across 86/85, when connected as 85 grounded, albeit fixed or switched ground, the relay functions normally.
    If this diode relay is connected backwards, it will be a dead short, diode in the forward biased direction in relation the supply potential difference, battery 12 volts. Gary
    Regards, Gary

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