W-T is a username who came up with the mod. You can search for other articles he’s written on mopar1973mans website. Smart dude, electronics engineer or something.
Moparmans website is down right now, so cant link article. Can search. “w-t mod simplified”. Pcm protection is a good one too.
Basically. Moves alternator + to passsenger battery with breaker protection. Grabs all the grounds from the front engine harness and splices them together on timing cover to remove ac inductive noise into ground.
Ground system not great with these rigs to start with. Pcm to passenger - has connector that can be spliced hard wired. Replace fender/body with 8awg. No frame ground that side. Main neg near turbo drain to clean check.
Drivers battery, new 8awg body, 4 awg to only frame ground near steering box bolts. Main - goes to bottom timing cover.
The only positive + to check is drivers battery to fuse box, and the fuse thats there. Clean and check.
Theres other grounds that connect thru out frame and body, but if you start with making the batteries good that should be a large improvement. OHM meter will be your friend. Leave an aligator clip on batt neg, and long extension to back of cab on good clean metal back there non paint. See how much resistance is there before and after.