Re: Current Leak in electrical system
We had this same problem with our '89 240. It was a nuisance for several
years. As long as you ran the car every day, it was fine, but if you let it
sit for a couple of days, the battery went dead. I nailed it down by
clipping the ammeter in series with the positive battery terminal (drawing
about 240 mA), and pulling the fuses one at a time.
In my case, it turned out to be a faulty door switch (to turn on the dome
light). Remarkably, turning off the dome light manually did not fix the
problem. I ended up removing the door switch (it was the right rear door,
so nobody complained).
Without the extra load of the faulty switch, just the clock and whatever is
used to store radio presets, etc., the latent current draw is about 25 mA.
"Bill" <email@example.com> wrote in message
> Something is draining my battery to the point where my 1987 Volvo 240
> goes dead. I had the battery loaded tested and proved good. I
> installed a new Bosch alternator thinking the current was leaking
> through alternator but the car battery still goes dead after 3 or 4
> days of sitting in the garage. If leave the battery cables
> disconnected, the battery is fine. Following are testing results with
> an amp meter:
> 1. With the positive battery cable disconnected, at first positive
> contact between Positive on Battery and Cable with a Fluke Meter, we
> measure 200 mA.
> 2. After two seconds, the amperage reading drops down and stabilizes at
> 80 mA. We believe 20 mA of the 80 mA is the car clock.
> I suspect some type of electronic circuit board is charging up
> capacitors and then drops back to 80 mA.
> Does any one have any thoughts? Does anyone have a better strategy to
> diagnose current leakage?
> Bill - Philadelphia