2000 Ram Torque Converter Lock-up: Bad science, good results

Back in April I posted about a torque converter lock-up problem that I was experiencing on my 2000 Cummins 2500. Since that time, every time I drove the truck, at about 45 MPH the torque converter would jump in
and out of lock-up. For months I dealt with it by stomping on the accelerator or eventually it got so bad I had to shift out of overdrive, especially while towing. I tested what I could on the APPS and the brake pedal without solid conclusions. Anyway, it eventually got so bad I had to do something. As a last drastic measure, I tried these two fixes, and if they hadn't worked I was off to buy the $480 APPS the next day. The fixes were to "reset" the APPS and to reroute the alternator ground wire. Well to my surprise, one of the fixes worked (don't have a clue which one) and the problem hasn't presented itself again in 2 weeks/500 miles. The only suspicious thing I observed was the ground wire was laying across and in contact with the alternator, so I relocated it and shielded it. If that was indeed the problem, kudos to Tony Garcin at Dunrite Converters for sharing! It could have been a long time before that was discovered. While I don't know which fixed it, if the problem reoccurs at least I know it's electrical which gets me somewhere (and I suspect if it's the APPS it will resurface).
Anyway, thanks to all who responded. I offer this in the hope that it helps someone else along the way.
While I was on a roll, I finally installed the fuel pressure gauge that Roy and Tom had advised years ago. It was an easy fix with the parts from Geno's.
Jack
How to reset the APPS: http://www.dieseltruckresource.com/faq/faq.php?display q&nr8&catnr=7&prog=1&lang=en
How to shield the alternator ground wire: http://www.turbodieselregister.com/news/index.php (about 2/3's down the page)
Original post: http://groups.google.com/group/alt.autos.dodge.trucks/browse_thread/thread/c706293edf7f9fa4/0d7ebab565665f7b?lnk=st&q 00+dodge+apps&rnum=1&hl=en#0d7ebab565665f7b
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jackvt80 wrote:

I had that problem with a 2001 Ram. I rarely could drive it on the freeway, even flat ground, not towing and the TC would constantly lock/unlock. The dealer replaced the TPS which did not help. They had no idea what to do and DCX was of no help in the matter. I finally talked to a Dodge transmission specialist. He said he solved that problem long ago. I do not know exactly what he did but it involved alternator noise causing the TC to lock/unlock. He rerouted wires and added a filter. Problem was solved. I have no idea why DCX could never solve the problem.
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I also have a 2000 CTD 4x4 that experieneced the same problems. I also found the solution on this group. The local Dodge dealer said my TC was bad. The so-called best transmission mechic in town replaced the APPS. So after I had spent about $1000.00 my problem was still there. I didn't move the ground wire, I just shielded it and I purchased a noise filter from BD Power and installed it. Real easy, one end splices into the APPS power wire at the PCM and the other end goes to ground. I did both about the same time so I do not know which one fixed it but the important thing is that it is fixed. Two months now!!!
Thank You to everyone that gave me advice.
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