I have a 1987 300D. The problem I am having is that I am getting a feedback of current thru the wires to the #9 fuse. It is causing the radio and auto antena to draw current and run my battery down. Was wondering what controls the time delay when the car is turned off. That maybe this is not breaking the circuit and causing the problem. Would appreciate any advice.

Have narrowed down my problems. Think it is the ignition switch. Can anyone tell me if I can replace the electrical part of the switch without pulling the hole switch. The key part of the switch is working fine.

I'm having a similar issue, my radio has power all the time. I checked the power wire in the back of the radio and it has 20 volts? Not sure how it's getting 20 volts in a 12 volt system but that's what the meter reads. I pulled the fuse to the radio but the voltage is still there.
Everything ells is normal as long as the radio is not connected. I don't think it's the ignition switch but it's getting voltage from somewhere?

I'm pretty sure you must pull the ignition tumbler in order to access the electrical ignition switch.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

Max is correct—the electrical switch is attached to the lock tumbler and comes out as a unit, then the switch can be replaced. There are numerous threads on this forum on the procedures including warnings of significant "gotcha" events that one must avoid when R&Ring the tumbler/switch assembly.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970