Put a 12 volt light between the Negative(-) battery post/terminal and ground. If the light comes on, you've got an electrical drain. To troubleshoot where it's at, start disconnecting/pulling the fuses until the light goes out.
Do this with a fully charged battery, and the engine off.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
