i just wanted to post this up in case any one else has had any similar problems. in case they searched because i looked and didnt find any exact anwsers. any ways, my truck is a 91 ranger with the 4.0 auto. for a while i had a hard time starting after it ran for a while. it would act like a bad battery,wait for 3 min and it would start right up. finally just the other night i went out to start it and it would just click one time. i tried jumping the solinoid and it did the same thing. i though it might be a bad starter or even froze. (cold temp) so i took it off and had it tested and it was good. ended up being a bad ground wire,and auto zone had to order it in. i matched the length with what they had in stock and spliced in the (2) wires off of the vechile side to the one wire they had. starts right up,totally different truck. after i got that done it started fine for a day and then started having a problem after it sat over a 5 hr time. figured out it had a drain on the battery when i let it sit over night and i pulled the pos. cable and in the morning started right up. i did that for 4 days because i was working 3rds and the temp around here is like 8 degrees. i put my volt meter on the batt after turning it off and could watch it drop. pull the cable off and watch the voltage and it would actually start going back up. started pulling plugs under the hood and found if i unpluged the alt plug it stopped the drain. also ran my test light from the neg cable to the neg. post when it was disconnected and the positive was still on the batt, and boom that thing lit up like it had 12 volts going to it when the alt. was plugged in. with the truck runnig the alt. was charging the truck around 14.6 volts. took it to o'riellys and the alt. tested good and the guy said that he doubted that the alt would cause that. took it auto zone and had it tested and it failed. bought a new alt and its all fixed and running great now but it was a head ache. sorry for the book here but thought maybe this might help someone.