In need of assistance regarding major electrical drain on my 1982 Cadillac Eldorado HT4100 V8

IM IN NEED OF HELP INVOLVING A MAJOR ELECTRICAL DRAIN

I've been having electrical troubles with this thing since the beginning of November. Before then it had a slow battery drain. It started after I hosed off the underside, after which, the battery would go from full to dead in less than a minute running or not. I then found that 3 wires leading to the starter solenoid hod no insulation and were touching bare engine metal. I taped these up and found a few more bare wires on the top end of the engine that I taped up. I cam now hook up the battery and run it. When I use a multimeter on the battery while running, it sat at about 12.36 volts and went up by about 0.01 volts every 5 seconds. After leaving it hooked up while sitting, however, the battery was dead after about 12 hours. I have checked all of the Fuses to see if any had blown and 3 had, so I replaced them. None have blown after the drain started. The battery is new and holds 12.99 volts outside of the car. I think the alternator is bad as it is the original but I don't want to spend $80 on an alternator if the one that's on it already works. I'm trying to get it going by my birthday on the 29th. I am almost positive there is a short somewhere, but I would like to see what yall have to say. I have basic tools, a test light, and a multimeter. Feel free to ask any other questions that would help me solve this issue. Thanks in advance.