I have my eye on an E320 that looks to be in good condition other than a transmission on it's way out. It has less than 150K on the clock and the price seems reasonable. I already have a daily driver, so I can take my time addressing the transmission issue. It won't go in reverse, but I'll be able to give it a healthy test drive.

How can I tell if the wiring harness is updated in case the owner doesn't know? Anything I should look for or listen for while driving? Thanks

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'81 300SD