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Had a chance to mess around with the '89T and '90 SPG today. I have several other cars and I don't drive these very often so I find the batteries dead once in a while. I took some interesting measurements today.
Here are some notes in case it helps anyone else establish what is "normal" draw:
Temperature: 52 degrees. Both cars have batteries under a year old. I removed fuses one at a time with a VOM set on the 0-200 milliamp scale in series with the negative battery cable.
Unfused draw on both cars is 3.5 milliamps. I have no idea where that is coming from. Perhaps there are fuses in locations other than the fuse box. Perhaps the ECU?
Anyway, the only two fuses that show any parasitic load at all are the Central Locking fuse (#24) and the Interior Light/Clock/Radio Mem/Ant fuse (#28). The locks draw about 13-14 mA and the stuff on fuse 28 draws about the same or a few milliamps more on each car. The draw on fuse 28 is a bit variable, which I believe is related to the clock movement.
From this one would expect a total draw of around 30-35 mA, but somehow something is cancelled out and the total draw swings between about 17 and 25 mA. This is true for either car.
A good result. I've read that anything up to around 50 mA is acceptable in a car. Nothing wrong with the cars, I guess I just need to drive them more often and keep them on my battery maintainers.
Paul Bob
posted by 68.94.207...
, Fri, 2 Jan 2009 07:23:41
, Thu, 1 Jan 2009 13:21:30
, Wed, 7 Jan 2009 15:06:07
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