Tom, I really want you to succeed with a better high idle, that's why I posted the other link. I can't really help you more than that because I don't have any experience altering the 5 volt system. I've only done diagnostics on it when needed. The vans are a weird combination of OBS pre-97 trucks, 99-03's, and tight space engineering! I'm sure you'll get it done.
The only reason I mentioned the spare computer is that's exactly what happened years ago to another intelligent guy who was putting one together. He was doing some kind of testing and his daughter came in hollering, "Supper time!" and it scared him. That caused him to jump and when he did, he cross-contacted some wires. After some more testing, he realized he fried the computer! Funny now, but probably not that day!
The lack of replies from other guys who have done this is probably because most of them have moved on to newer trucks and later forums. Good news is that there's still quite a few guys on here that are like PSD encyclopedias and willing to pass that knowledge along first hand, for free!
I'm grateful for that every time I think about an under dash wire fire that melted the harness in one of my first trucks! I spent 2 cold winter weeks alone with a greasy Chilton's book in the driveway! Boy, did I need the internet that time! I'm glad you're posting your progress for the next guy who wants to build his own high idle! Cheers!
2003 E-350 7.3 PSD EB, RR Frx & Hpx,Hutch/Stanadyne FM100 Pre-Filter, WW2, EBP delete pedestal/Hi flow outlet, Spectra Premium F41B Fuel Tank, 203* tstat, & coolant filter, Bellowed/wrapped up pipes, Walker BTM, AIH delete,AM EGT/TRANS/FP gauges, ThermalZero turbo blanket, KYB MonoMax shocks, TTC-2814 HD coils, Ford Ambulance Steering Stabilizer, Michelin 285-17’s Load Range E, Rear 10 leaf packs, CCV slightly modified, full sound mat, Curt Class V Rear Hitch and 2" Front Hitch, Tekonsha Primus, Nav., 2 AGM's, 2000 lb. roof rack, inverter, insulated, custom bulkhead, tool bins, 170k, my 18th
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SOLD: 1997 F-350 7.3 PSD, 4X2, XLT, CC, LB, STD, 240K and counting
SOLD: 1996 F-350 7.3 PSD, 4X2, LB, AUTO, 175K and counting