In my continuing capacity as token bilingual guy in Korea, I've been asked to find the wiring harness for a MB motorswap. The engine is a 6.0L v12. It's going into a late 90s C500. The bad news is that nobody knows what year or model car the engine came from.
Will this matter, and if so, how can I determine what I need based just on the engine?
I appreciate any help. 
We're talking a non-turbo, right? Wiki narrows the M120 6.0L applications down to the 1991-2002 600SEL, S600, CL600, and SL600. I'm guessing the changeover from OBD1 to OBD2 throws another spanner in the works, esp. since you didn't mention if your buddy's C-class is OBD1 or 2. Do Korean market cars use the same VIN system as the US, and if so, is there any VIN or serial number present on this engine?
(not an M-B guy)
In the German car world, not knowing the model year can make it difficult. Heck, knowing the day of the week it was built on, or even what the engine builder had for lunch can make it difficult.
{Excerpt from service manual} The orientation of the part should be 12 o'clock, unless Hans had beef for lunch, then it would be 2 o'clock. If Hans had a burrito for lunch, orientation would be 8 o'clock"
In reply to DrBoost: Well its not likely that Hans had burritos for lunch often, I'd be more concerned about whether he had beer or schnapps. 
And on a more serious note, weren't the OBD1 Benz V12s the ones with the infamous biodegradable wiring harnesses?
I would start by finding an engine VIN and a chassis VIN and going from there.
Okay, I'll try to go with the vin. I'm pretty sure the engine is imported from a car that was in Japan, although if it started there I have no clue. I have a feeling this is going to suck.
Lantanaml320 on mbworld may be able to help. You will need a v12 ecu, and harness. Most likely access to MB Star, along with a German speaking friend. You are a brave soul to consider this swap.
Is it a 48 valve or 36 valve V12?
It's not my swap, thank God. I'm the token white guy and only one who can speak English so I get asked to look into stuff like this ...
It's a 48 valve.
Thanks, guys.
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