I am posting this for my friend (neighbor to my mother). He has a 24V Ram, '01 I think. Anyhow, he has been fighting the lock-unlock problem for a while. I had him pull the alternator fuse and try it. Same thing, no change. I also put a multi-meter on the alt to test for AC voltage and it was .013 volts at the highest. I suggested checking the trailer plug and possibly the brake light switch. He did say that if he cleaned the battery terminals and reset the APPS it might be good for two months or two days. What else should he check?