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Why does the battery drain when car is off clicking sound coming from the passenger side firewall area when charged battery connected?
There are several relays in that area and any one of them could be engaging. It's not possible to tell you which is causing the problem or in fact if that is even the problem. You'll need to track down the component that is draining the battery, and you can do that by disconnecting individual circuits.
To start, try removing a fuse that controls something that you suspect, then reconnect the battery, see if the sound comes back.
Alternatively, have someone connect and disconnect the battery while you try to isolate the source of the sound.
Often automotive diagnostics is strictly trial-and-error, and you'll just need to keep searching. I can only say that there are 3 relays at that spot, as above the a/c relay, the fuel pump relay, and if the car is 94 and later, there will be another relay for the electric cooling fan. The fan relay is the most likely suspect because it will run without the key being on, and if is malfunctioning, it will drain your battery. Before you run out and buy anything, they, (auto zone) will test it , the relay or relays, replace the one or how many may have gone south on you. jr
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