Adding keyless entry to a W124 Cabrio and want the lights to flash when I lock it. Any module under the seat that would work? Are wiring diagrams posted anywhere?

you're questions are a little scattered and non-specific. but you can try starting
here to see if your car is covered:

http://autolib.diakom.ru/CAR/Mercedes-Benz/1996/E320/SYSTEM%20WIRING%20DIAGRAMS/

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-- raymond~
47º 34'N 122º 18'W

For this I run wires into the trunk and connect at the taillight harnesses.

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#dontdealwithkahlil

I meant the parking light circuit. You can't tap into it off that module under the rear seat cushion?

No.

You can intercept one of the looms of wires that runs to the rear of vehicle and splice into the parking lights, but I'm not sure exactly where that runs on a cab.

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Watch him go!!! link

#dontdealwithkahlil

Got it.