The most common cause is the alarm siren under the cowl, in front of the windshield. You can replace it or just unplug it. It has built in batteries that leak with age and short out causing battery drain. You may need a small puller to remove the wipers.

HOW TO:

https://www.crossfireforum.org/forum...g=1#post989003

Fuse 9 is the alarm system. It also supports other functions.