Greetings,
I pulled the amp from my new to me 300SD to start troubleshooting the cruise. Cruise does not do anything - no speed change, no hold etc. Pulled the amp and found its from a 380SL part #0015457632. I'm guessing this will never work with my 300SD? Or should I re-solder this amp and try it anyways?
Thanks in advance,
MJK

Early 300SD's were equipped with 001 545 76 32 units. My own 82 300SD had one and so have a few that I've worked on.

The unit should work in the SD once repaired. I've had a number of people send me 76 32 that came out of their SD and never had a problem.

The EPC often which does not always have 100% of the part number history. For example the 001 545 79 32 and 002 545 32 32 are both compatible with diesel W123s but IIRC it does not show up in the EPC.

According to the EPC, the 300SD has the following amp possibilities:
002 545 16 32
002 545 82 32
003 545 86 32

Also remember to test your actuator! https://sites.google.com/site/mbcruisecontrolrepair/home/diagnostics/actuator-testing
Let me know how your repair goes. If you have any questions, feel free to ask. I also offer repair services and testing if you are interested.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

Best bet is to contact forum member JamesDean. He can get you a rebuilt amp that's the right one for your car for $60 or so.

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Thank you both for the quick replies. I've read some success stories with the re-soldering of the control board. The PO said it worked intermittently, but so far I have yet to see it do anything at all - only had the car a week.

I will probably re-solder this one and see if i see any improvements, and I will definitely contact James Dean regardless.