I'm sure you've covered this, but have you checked that the terminals on the battery actually seat properly?
I had similar issues, and it turned out that the battery posts, as well as the harness terminals had worn enough for the clamp to be unable to put a proper squeeze on them.
As a temporary fix I've wrapped a stripped wire (basically the copper strands) over the top of the battery post, and the terminal over this. Gives a good tight fit and with the right wire, a decend conductive surface.
Edit,
Something like this would probably be a better fix, if this was your issue.
Battery Post Lead Shims
2007 L322 3.6 TDV8 Stornoway
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