Possible electrical problem in '77 300D?

[LarkB]

Hi, everyone. I have been having a battery drain problem. Have replaced the battery and the alternator, but the problem persists. I don't have a wiring schematic, so I'm at a loss as to where to begin. Does anyone have any ideas what this could be? Thanks for your help.

[podunk]

Hi: I answered another post with a problem similar to yours.
I hope this helps
try this at night, or in a dark garage, with the car doors closed check out the interior lights and make sure none are on, the vanity light on the passenger side is a common culpret of this problem also sometimes it can be that the light in the trunk, or under the hood, or in the glove box is staying on due to a faulty switch.

[LarkB]

Thanks, podunk. I'll do as you suggested. (Sorry about the cross posting. I did glance through the forum and didn't see a similar problem.)