I don't know for sure about the 67/68's, but on our '66, there is a big negative cable that runs from the battery negative down to the passenger side of the engine. I had a radiator leak that had corroded that connection at the block, and was causing different weird electrical stuff.
I took the bolt out, shined everything up, and used several external/internal lock washers, sandwiched between the different cables and the auto trans line clamp, to make sure everything was making contact.
Hope this helps, Dave
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