When the battery depletes while parked, it’s likely due to the battery itself. Otherwise, sandpaper can work if you’re in a pinch, just make sure to wear gloves. They are usually less than 10 bucks at the local parts store or Wal-Mart. There are specific battery post cleaners that you can buy. Corrosion can impede proper battery connection, leading to drainage issues. If significant corrosion is present, use a wire brush to clean it. Battery CablesĮxamine your Odyssey’s battery posts where they attach to the battery. Other causes include a trunk/tailgate release switch that is always on, a headlight switch stuck in the “on” position, aftermarket accessories such as an alarm system or CD changer, damaged wiring harnesses, and faulty relays. A faulty door switch (that turns the dome light on and off) frequently causes a parasitic power drain. If it’s higher than that, then something is drawing current, and it must be addressed.īefore connecting a multimeter to the battery, verify that the dome light is shutting off when you close the doors. The draw should be less than 25 milliamps (0.025 amps). Remove the negative cable from your Odyssey’s battery and use a multimeter to measure the draw. To fix this issue, you’ll need to test for a parasitic power draw. Parasitic Power DrawĪ parasitic power draw is when something is drawing current from your Honda Odyssey’s battery after you turn the vehicle off, like an interior light or a malfunctioning component. If your van is running fine when you park it, and it won’t start, there is an issue with the charging system (alternator, battery, or battery cables) or a parasitic power draw. Honda Odyssey: Battery Draining While Parked Causes The two primary causes for a battery to deplete are parasitic power loss or a faulty battery. If the battery drains while driving, there’s likely an issue with your van’s alternator. If it is draining while your Odyssey isn’t running, something is drawing current that shouldn’t be. If your Honda Odyssey’s battery is draining, it’s something that’ll need addressing right away.
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