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3.5 Amp parasitic draw with all fuses and relays removed, '94 940T

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

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walczyk
Posts: 10
Joined: 15 May 2011
Year and Model: 1992 940GL
Location: Farmington, CT

3.5 Amp parasitic draw with all fuses and relays removed, '94 940T

Post by walczyk »

Hi everyone, it is as the title says. I removed every fuse and relay under the radio and the draw remains. I also disconnected the starter, hoping it was some sort of short in there, but still it reads 3.5 Amps. The battery was dying overnight and I began measuring current and got 31mA until I tried started the car and it went up to 4.6 Amps, didn't turn over, and then the draw stayed at 3.9 Amps and dropped lower to 3.5 Amps as time went on. Could this be some module that woke up and won't shut off? I'm really quite baffled by this. I was hoping for some information before I start separating out wires. and tracing this down, hopefully it doesn't go back to being intermittent.
Thank you everyone!

walczyk
Posts: 10
Joined: 15 May 2011
Year and Model: 1992 940GL
Location: Farmington, CT

Post by walczyk »

Update: It was the alternator!! I saw an old comment mentioning that common causes include the alternator diode, so I disconnected it and boom! The draw is gone! Plugging the relays back in are going to be the hardest part of this job now.

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