Bulkhead connector

I recently obtain diagrams for the VIN R series in reference to PCM pin outs. I should requested a Bulkhead connector pin outs diagram when I registered. The 2000 Chevrolet 2500 express van wiring harness VIN R series, would be fully functional however, the bulkhead Connector has got me stump. Dissembling the mate connector in the interior is a chore when I don't have knowledge which color wire orientates to their particular function. It's a 35 pin Connector starting A thru E. Each letter has 7 terminal cavities, A1 thru A7 and E1 thru E7. The last 3 terminals in A5, 6 and 7 are for heavy gauge wire and E1, 2 and 3 also with 3 red 10 gauge wires I know the first Connector I've seen from a1997 Silverado. And this is the 2000 Chevrolet 2500 express van. So this is the swap. I. Repinned the 4 connector PCM wires accordingly from the 97 Silverado harness to the 2000 express. Same motor's, PCM's and the bulkhead connector. But, again, I'm not a calculus teacher on wiring engineering and I appreciate this website has helped me in the past. My deepest appreciation is for the bulkhead connector pin outs for a 2000 Chevrolet 2500 Express Van. I'm disabled and on a fixed income so I can donate a small amount to this website. Thank you.