1992 dodge w250 automatice. Replaced MIA tps with POT on dash. Works great. After 4 months of daily driving summer has set in. If the air temp is above 80, once engine comes up to operating temp, the alternator drops charge down to about 12.3 and overdrive is nil, when this happens... It is my only wheels since i blew tje headgaskets on my 6.0L ford. I need all tje advice I can get... I replaced alternator and it didn't help.