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Thread: Battery Drain From Holley Waste Spark DIS

  1. #1

    Default Battery Drain From Holley Waste Spark DIS

    I have a Holley Terminator and the 8-cyl DIS Waste Spark system with a crank trigger. Everything works good until I park my truck. The DIS coil packs are draining my battery. I can put a voltmeter on the battery, and it will show 0.5 amps with everything off. If I pull the DIS 20 amp fuse (on the 14 AWG power cable to the battery) the volt meter will go to 0.0. Put the fuse back in and the meter goes to 0.5 amps. I've checked and the trigger grounds (black/yellow) for all four coils are wired to B14 of the ECU, with a good clean soldered connection. Does anyone know what could cause these coils to drain my battery?

    I can unplug the harness from each coil pack and watch the amps drop down.
    4-coils = 0.5 amps
    3-coils = 0.4 amps (1 coil unplugged.)
    2-coils = 0.2 amps (2 coils unplugged.)
    1-coils = 0.1 amps (3 coils unplugged.)
    0-coils = 0.0 amps (4 coils unplugged.)

  2. #2
    Join Date
    Nov 2013
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    Chicago IL
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    1,952

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    The coils need to go to a Keyed Ignition source, NOT directly to the battery. The simplest solution, so you don't have to change a bunch of wiring, is to just add a relay inline with the coil power feed.

    Terminal #30 from battery.
    Terminal #87 to coils.
    Terminal #85 to ground.
    Terminal #86 to keyed ignition source.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

  3. #3
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    Quote Originally Posted by S2H View Post
    The coils need to go to a Keyed Ignition source, NOT directly to the battery. The simplest solution, so you don't have to change a bunch of wiring, is to just add a relay inline with the coil power feed.
    That's fine, although that's not how it's wired in the Holley waste-spark DIS manual. (LINK - Figure 3/4, Page 6/7) Excerpt from Holley DIS instruction manual: "Main DIS Power Cable – The main power is a fused 14 ga. cable that should go directly to battery power. It then splices into the individual coil harnesses."

    Quote Originally Posted by Dan LeBlanc View Post
    I have a Holley Terminator and the 8-cyl DIS Waste Spark system with a crank trigger. Everything works good until I park my truck. The DIS coil packs are draining my battery. I can put a voltmeter on the battery, and it will show 0.5 amps with everything off. If I pull the DIS 20 amp fuse (on the 14 AWG power cable to the battery) the volt meter will go to 0.0. Put the fuse back in and the meter goes to 0.5 amps.
    I also have the Holley waste-spark DIS kit (no relay). I have a 0.43 amp draw at key-off, but removing the DIS coil pack fuse doesn't eliminate it. In your case, I'd install the relay.
    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.

  4. #4

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    Can I tie into the existing relay that's on the wiring harness, or do I need to build a new relay with a new Tyco 12VDC plug?

  5. #5
    Join Date
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    I wouldn't add the ignition coil pack load to the system relay (fuel pump & fuel injector power).
    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.

  6. #6

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    Installed a new relay for the DIS coil packs, and it seemed to solve the problem. Battery drain is not registering on voltmeter. Truck can sit for a week and will start right up. Thanks for the help.

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