The battery drained every three days on a 71 300 series dodge van. I used it just on weekends or during times when my wife or I needed to transport all six kids of our children.

I traced it back to the cluster/steering area by following the drain from the battery one wire at a time. It turned out to be the emergency flasher mounted on the steering column. It was the old push button under the column type which has burnt out thereby not flashing when pushed.

Somehow, someone had pushed it into flash position. I pulled it back into off position and the problem was solved.

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84 300SD
85 380SE
83 528e
95 318ic