Slow or intermittent ground leak, diagnosis tips?
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This is a discussion on Slow or intermittent ground leak, diagnosis tips? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi all, got an '04 WRX that's leaking charge off the battery either intermittently or just consistently but very slowly. ...

  1. #1
    Registered User
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    Nov 2009

    Red face Slow or intermittent ground leak, diagnosis tips?

    Hi all, got an '04 WRX that's leaking charge off the battery either intermittently or just consistently but very slowly. Most of the time, it's not an issue since it doesn't leak enough overnight to prevent it from cranking. Leaving it off for a day or two drains the battery to ~7V (accessory lights come on but not enough juice to start) and anything past there and the battery is totally dead.

    What I've done so far:

    (1) Checked the alternator, it's providing a good 14.5V when the engine is going. The battery is charged up to 13-14V right after shutoff (naturally, since starting the next morning works).

    (2) Had the guys at Autozone check the battery, their little machine reports it is in good health.

    (3) Checked the connection from the battery post to the wires, cleaned it off and tightened it back down. Virtually no resistance from the battery terminal to a check point upstream.

    At this point, I have no idea what has changed. I know for sure that last March I left it at the airport for 8 days without issue, and I've done nothing but change the oil since then. It does have a turbo timer (Apexi), which is a natural suspect, but again, haven't touched it or its wiring for a year now.

    Thanks for the suggestions.

    PS. If this is over my head, suggestions for a good Boston-Metro-West (Waltham/Newton/Lexington) mechanic competent to work this out would be a good bet.

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  3. #2
    Registered User fortunesk89's Avatar
    Join Date
    Aug 2007
    kenosha wi
    sounds like a draw, get a multimeter (amps) hook it in series with the negative post on the battery and body ground,remove keys close all doors lock, shut the hood with the multimeters wires outside the hood wait 20-30 mins. anything greater 500mA you got a draw, start pulling fuses to find the circuit, remember to turn off your dome light when in the interior fuse panel
    2002 plat. silver wrx

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