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No, it doesn't sound right. He has to expand on "won't do anything". He's saying the engine won't crank at all and not a single electrical system operates, in otherwords it's like the car now has no battery at all?
In that case either there was a car fire and the harness was destroyed (unlikely) or there is some simple reason for it, something wrong with the battery cable or something. It sounds like an interesting project. The condition of the car is otherwise OK? Just curious, did the owner do this to it, or a shop?
You may not know, that's OK.
Get some more info out of the guy.
I saw this happen once to a 140 chassis S-Class V12 (S600),
big bucks to get it so that (for the most part) everything worked, lots more computers on one of those of course, luckily fuses protected the engine modules. It was towed in, but I had it running in under a 1/2 hour (fuses in the Base Module), but there was lots of random things that didn't work (locks, light, radio, etc etc) most of which was traced to control units. Had almost $4000 stuck into it in diagnostic time and module$$, Only thing I recall that didn't get fixed was the cellphone, needed a new handset and owner (who had just bought the car used in perfect shape when someone at an airport botched a jumpstart, which was needed because he didn't shut the dome lamp off) decided he wasn't really interested in the factory phone handset for $1000.
Hope this all help give a perspective, I think the CE is alot simpler than a V12 S Class, shouldn't run into this kind of money, not unless the harness melted for some reason, but reverse polarity I don't think would cause this much damage to wiring, just some modules. Luckily on something older like this you can consider using used parts, it's not all coded to the car like newer stuff is.
Gilly
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