Have frequent low battery on usually faithful '83 SD. Found clock was a significant current draw and that is now upplugged. Very good hint(s) on that.

Now draw is 21.1mA
with all fuses installed (fuse box near brake booster).

Removed 8A fuse #13 and
draw is 1.47mA now. Crkt #13 is the leakage path.

Fuse box label indicates loads are:
Diagnostic
Hazard Warning System
Clock (n/a as I've unplugged)
Central Locking System
Electronic Radio (I gather parenthesis around this item means "if fitted")

What is the quickest way to disconnect the radio from crkt #13?
Is there a semi-exposed lead anywhere in the cabin so I can splice in a switch.
Years ago I did the climate control R&R, and I suspect pulling the shift tray, ashtray
and then the zebrano wood panel is the way to get to the radio -- can't remember disassy well, and hoping for a quicker way to get at the radio power lead.