I have a 1983 Mercedes 300D, and after having a new head unit and powered sub installed, I'm getting a significant battery drain (1.5 amps).
Unplugging the head unit and unhooking the sub from the battery did not resolve the problem.
Pulling the fuse associated with both the radio and power antenna normalizes the power drain.
Does this make any sense? Some people have suggested that the installers may have "tapped in" to the antenna wire to wire the sub, and that the antenna wire is always hot, even when the power is off.
Any suggestions? I'm at a loss, and want to have some ideas before I start pulling wires to isolate the source.
Thanks in advance for your input!