The anti-theft alarm on my 92 300D is starting to get flaky (coming on when it's not supposed to), so I figure the simplest thing is just to disable it. I've read a couple of threads that describe the procedure, but I'm wondering why I can't simply unplug the relay (I believe located behind the battery). Will doing that disable something else?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

I suppose you cold just try it. If anything it may kill the starter or spark. My W126 had the module removed. Different car, but removal on this one did not kill anything. Central locking still works, etc.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car

Perhaps not dedicated relay.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

IIRC it's behind the false firewall in the passenger footwell. Usually a box with Becker markings. But yes, just disconnect it and everything else should continue to function normally.

Sixto
87 300D

I remember reading that on the W126 anyway they specifically didn't include an ignition cutout because they can cause problems.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.