Battery constantly drains overnight. Tracked it down to CTSY fuse circuit.

1995 BUICK CENTURY

76,000 MILES

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I'm wondering if in you experience you could point me in what might more likely be the cause of this drain...... door-locks, passive-restraint-solenoids? The fuse says it is used for Interior, underhood, courtesy, I/P, Trunk lamps, door locks horn relay, passive restraint system, deck lid release, power antenna, remote keyless entry, vanity mirror.

Mirror is not lighted. Does not have power antenna, don't know if it ever did. Driver side seatbelt is very slow to retract. Driver's door has a loose/broken outside handle. Horn works fine with fuse in place. All lights listed work and go out as expected. I'm leaning toward the seatbelt system or doorlocks but would love to hear your take.

Oct 7, 2011 at 1:41 PM

HMAC300

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with this system see if your turnklight is going off as well as your underhood light. next thing to check is glove box light. those are the most common culprits. easily checked at dark. the hoodlight should go off just before you close it. same with trunk

Oct 7, 2011 at 2:21 PM

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Thanks for the reply. I've already verified the three you mentioned to be functional (tested the trunk with the iphone recording video and shut it in both trunk and hood) . Glove box visually off. With the CTSY fuse in place and hooking a JumpStart box gets a huge spark. Without CTSY fuse, spark almost nonexistent so it must be something with a huge draw. I'm assuming its not a true short as the fuse doesn't blow, just a dead battery overnight.

Oct 7, 2011 at 2:59 PM

HMAC300

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best thing to do here is if this has a aftermarket alarm on it disconnect that and see if it stops. then start everyhting else tosee where the draw is. also make sure something else hasn't been hooked to it and that may be causin g it as well, like a trailer brake

Oct 7, 2011 at 4:44 PM