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Don't know if you had the small junction block off of the inner fender by the battery and cleaned up the stud, nut and lock washer or not. The 12ga hot wire for all of the electrical power except for the starter comes from that, runs across the top of the core support, and ties into two other 12ga red wires. One of the 12ga red wires runs from that to the firewall bulkhead connector and feeds the interior electrical.
Electrical diagrams are here:
http://67-72chevytrucks.com/vboard/s...d.php?t=185856
Below the diagrams in the first two posts you will find links to larger versions that you can save to your computer and print out.
There are a lot more ground straps needed than just the battery to the chassis (i presume you mean engine). If the frame and cab are not grounded, that might cause the problem you are seeing. Read through this post....
http://67-72chevytrucks.com/vboard/s...d.php?t=422234
LockDoc