Toyota Repair: 1986 toyota pickup , 4wd, 22r - carb, fuse block, using a voltmeter

Question
I have a battery drain problem. Replaced alterntor and battery, vehicle started right up. Left it sit overnight, and battery was dead the next morning. Jumped it to drive to work ( 1/2 hour drive ), shut it off, and it restarted with no problem.  Went out at lunch, and battery was dead. Got a jump to get home , and battery was fully charged when I got home. I disconnected the  battery and left it sit overnight. Battery was still charged in the morning. Putting a volt meter in between the neg. post and cable show approx 12 volt with key out of ignition. Started unhooking components looking for the voltage to drop to zero as advised in some sites on the web. Finally when I unhooked the cable from the pos terminal that goes to the engine compartment fuse block, the voltage dropped.. I was able to pull the fuses and relays one at a time to see which was the problem except for the relay marked (glow AM1    80A ) which I cannot seem to remove. Does this relay just pull out ?  I am afraid I am going to break it in pulling so hard. Could this be the source of the battery drain, or am I totally off base in my search? Thanks for your time, and I appreciate any help offered.
Bobbi

Answer
I agree that there may be a battery drain but using a voltmeter is not accurate, what drains a battery is current, the method you used will show 12 volts whether the current draw is 1A or 10, if your voltmeter can read amps then connect it between the battery post and the terminal, set it to the 10A scale and read the current draw, with all lights off and accessories off. The 80A fuse is bolted in, removing it won't determine anything anyway because that fuse supplies power to 90& of the elctrical system.