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Thread: Relay for fuel injector & coil driver power?

  1. #1

    Default Relay for fuel injector & coil driver power?

    I have a question about the EST 12V (B20 Pin). I'm using it to power a GS100102 Hall-Effect sensor after reading one of Danny's threads. I cannot seem to find that thread right now. Based on that thread, I understand that using 12V is much better than 5V for this sensor. Before I changed to the GS100102 for my crank sensor, I was planning on using EST12V to turn on relays for the fuel injector & coil driver (P/N 554-112) power. The reason I'm including relays for these two circuits is the OEM wiring harness I'm adapting to the Holley ECU has the relays. Would it be unwise to use EST12V to power the relays AND the crank sensor?

  2. #2
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    Quote Originally Posted by Jeep4.7 View Post
    Would it be unwise to use EST12V to power the relays AND the crank sensor?
    Yes, it's not intended to power anything that draws amperage. Use the green fuel pump wire to power
    the fuel injectors & ignition coils/coil driver, as it does anyway. See Holley Wiring Manual schematics.
    It has a 20 amp fuse and it also feeds power to the fuel injectors (& ignition coils - LSx, MOD & HEMI).
    Simply use the green fuel pump wire (+12V) to trigger your additional relay's coil (+) at terminal #86.
    http://forums.holley.com/showthread....9623#post69623 (System Relay & Injector Wiring Troubleshooting)
    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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    Use the green fuel pump wire to power the fuel injectors & ignition coils/coil driver, as it does anyway.
    I completely missed that terminal 86 was also routed to the fuel injectors. Doh! New plan is to use Fuel Pump Out (A2) to turn on my fuel pump relay, injector relay, and coil driver relay. Any issue with driving three relays from one ECU pin?

  4. #4
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    Quote Originally Posted by Jeep4.7 View Post
    Any issue with driving three relays from one ECU pin?
    No, that's fine. As long as it's only energizing the coil of each relay (not the load terminals).
    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

  5. #5

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    Quote Originally Posted by Danny Cabral View Post
    No, that's fine. As long as it's only energizing the coil of each relay (not the load terminals).
    Thanks.

  6. #6
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    You're welcome.
    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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