I have a slow but annoying battery drain that takes about two weeks to kill that battery. It is being caused by the fuse that runs the interior lights and the horn. I have been preventing by pulling the fuse every time I get out the car but I can't be doing this forever. Also, the original owner had a fan overdrive put in as the right fog light button and had the left fog light button control both, could this be linked to this issue. Any Ideas? Any one ever have the same issue with this fuse before? HELP!

Previous owner had the issue, new battery still continuing problem

Can't see how the fan is linked to the drain its the interior lights fuse. Any other ideas what could be the source?

Anyone?

Well the fan shouldnt be linked into it but then again there shouldnt be a fan override switch either lol. As unlikely as it sounds i have to side with NINA on this one because unfortunetly 80-90% of the time theres a "short" its because someone got into the wiring when they dont know what there doing. My best guess though beyond that would be the radio as it seems again 70% of all shorts in encounter are in some way related to an aftermarket radio that was installed wrong. Has this been going on forever or just developed?

Good question, I'd love to know the answer to. The car is a new one for me. Previous owner had the issue, I believe the original owner installed the fan overdrive instead of the sub woofer control. I'm not exactly sure how long it has been causing a problem, my guess is that the PO had the issue ever since he owned the car also.

Well at least you know roughly where the issue is. Knowing what circuit its on narrows it down a lot! Again i have a strange suspicion it was something a PO did so i would start by check the fan stuff and the radio. Anything really that you can see has been messed with. Ive also heard of the hatch pull down motor causing an issue but that would likely cause your battery to drain down way faster. Old aftermarket security systems also had a fairly large draw.

This isn't a fix for the short problem,but if the car sits in a garage go to WalMart and buy a battery Tender.They're only about 20.00 and kick on when the battery goes low. Would help to keep it up.

The fuse you speak of sends power to the Interior light, Horn, Door chime and also maintains power to the radio's memory. Any one of those circuits might be suspect. If you also suspect the previous owner's mess then undo it. An aftermarket radiator cooling fan controller costs about 35 bucks and can be dialed in at any temp from 160 to 225. Get it at any O'Reilly auto parts store. It's made by Hayden.
I don't agree with the soultion of using a battery tender to solve your problem however. Battery tenders are good for vehicles without electrical problems. Simply leaving a car to sit with the battery connected will in itself drain a battery over an extended time. There are numerous circuits left "at potential". To use a battery tender to "solve" your problem will only mask it. Worse case scenario the hidden problem will only get worse until the circuit fails.
Find someone with auto electrical knowledge and isolate each circuit with a multimeter. This is the only true way of repairing your fault.
Good Luck