Dumb A

02 ram 3500 4X4 manual 6 speed. I bought it in sad shape, wouldn't start. New items are batteries, battery cables, starter, alternator. At this point it would start and run, instrument cluster worked. Still no charging. I tested voltage coming from PCM, blue wire to ground=0. I had checked continuity of green and blue wires to make sure they weren't eedshorted or open. I'm assuming PCM was bad. At this same time I decided I would charge the batteries up. I removed them and charged them. Upon installing them I accidentally shorted black and red together on the passenger side with the driver's side hooked up. Then when I started the truck it ran but no bus appeared and no instruments worked. I installed a refurbished PCM and got 7 volts on the blue wire to ground, still no charging or instrument cluster. I have a cheap obd reader and when I leave it hooked up while running all my gauges work. When I unplug it they stop working. Also getting a 1698 code that keeps coming back. I want to thank all of you for helping this far,I couldn't have done it without you. I did download the service manual but I'm not very good at reading electrical skematics. This is the first post I've ever done so be patient with me, thanks...