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Thread: 558-401 to add 2nd WBO2 sensor.

  1. #1

    Default 558-401 to add 2nd WBO2 sensor.

    I recently purchased a 558-401 to add a 2nd WBO2 sensor to my Dominator, but it did not come with any wiring instructions? I searched Holley's website, but did not come up with anything. Does anyone have any experience with this?

  2. #2
    Join Date
    Dec 2009
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    It's a Holley J2A Auxiliary Harness. It connects to the J2A ECU connector, and the 2nd WBO2 sensor is plug & play into it.
    The Holley 558-401 J2A Auxiliary Harness has the 2nd WBO2 sensor harness already wired into it (for dual WBO2 sensors).
    However, it also provides 23 Inputs of all types (no Outputs), Sensor +5V power & Sensor Ground. It's very useful.
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - J2A Pin-Out/Inputs, Pages 7 & 27)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #3

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    Hi everybody. I have the same question about the Holley 558-401. The wiring manual does not say anything about the three loose wires in the 2nd WBO2 sensor harness. The orange, black & black/white wires, where do they go? Any Holley reference?

  4. #4
    Join Date
    Dec 2009
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    Connecticut
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    18,687

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    Quote Originally Posted by Joystick View Post
    The orange, black & black/white wires, where do they go? Any Holley reference?
    http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - J2A Pin-Out, Page 7)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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