This is something I've never really concerned myself with, but have always wondered. Red and the Bronco sit alot, but I fire them up every week or so to keep the fluids flowing and whatnot. That said...they don't always get started weekly...and I've noticed I can turn accessories on and roll the window up and down in the Bronco all month without actually starting it...and when I finally do start it, it'll fire right up...no questions asked. Also note, the Bronco was completely rewired by my father and myself when I bought. Red on the other hand, can sit for a few days/week and be dead as a door nail when I go to start it. I haven't noticed any draw at the battery or fuse box. The wiring is about as original as you can get except for a couple sockets. Both rigs have the same alternator and battery. Like I said, I've never really concerned myself with this, because I usually drove them often enough not to notice, but since bother have been sitting for a while...I've noticed the difference. Any suggestions as to what's going on?