[Vwdiesel] Odd Power Drain

brian gochnauer brian at gochnauer.net
Mon Jan 5 18:35:43 PST 2009

Disconnect the battery and see if it discharges over a couple days (internal
battery problem)
Caution: may cause the radio to stop working because of the aniti-theft

a second thought; I noticed this morning (in the dark before sunrise) that
with the keys in the ignition, the back door slightly ajar, the dome light
would NOT go off (timeout), that would definately drain your battery over
two or three days. The fact that it drains the battery to 5.xx volts almost
for sure means its a resistive load like a light (dome, trunk, engine
compartment, courtesy mirror)
if it were an electronic load that required the normal 12 volts it would
probably cease to (drain) work around 9 volts.


On 1/5/09, Dave Cook <davevw at yahoo.com> wrote:
> On an '01 Jetta TDI w/auto trans.
> The battery will hold a charge for a couple days just fine, then after a
> couple days, it will be dead enough to not start the car and will eventually
> drain all the way down.
> If you drive the car every day or two, there is no problem.
> I hooked a voltage meter to the battery and checked it periodically over a
> few days. The first two days, it was right around 13.75 ish volts. I didn't
> check it one day (Christmas) but came back on the fourth morning and it was
> down to about 5.5 volts or so.
> So, it is like suddenly something kicks in after a couple days and draws
> down the battery.
> On a freshly jumped/charged battery, I measured almost no amps being
> pulled, and it wouldn't light a bulb placed between either battery terminal
> and that terminal's main cable.
> The only known electrical problem with the car is that the passenger door
> doesn't work at all. The window won't go down with either switch, the lock
> has to be operated manually, etc.
> Ideas?
> Dave Cook
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