Cold weather and Electrical question

[STLstroker]

For some reason i have replaced an alternator every damn winter since i have had my truck. I have replaced the alternator 2 times in the two years i have owned her. It only does this when it gets cold out. I changed the starter last year, GPR, Batteries, and alternator and yet i get the same result every winter. Since i changed the GPR it almost seems like i lose power when the truck is off. Sometimes when i turn the key to the start position there is almost like a click or buzzer sound behind the ignition key. I also see that my battery voltage is lower also. They aren't dead, but lower than they should be. I live in missouri and its only getting to about 25 degrees at night. I can only get like 3 good cranks sometimes and then it goes down hill voltage wise. Also when i have the truck plugged in the batteries don't seem to lose voltage. The buzzer sound is none existant when the truck is plugged in. IT only started making the buzzer sound when i changed the GPR. PLEASE HELP. PS Sorry this is such a long thread.

[silverF250]

Where in st. louis are you at? Sorry can't help you out, but I know a guy at a battery shop in Arnold that might be able to tell if you have a draw, and maybe where. Ellis battery talk to Bob Starkey.

[STLstroker]

no kidding. I am from South County extremely close to Arnold. I am at school about 45 minutes away now but i know where Arnold is. My sister actually lives there

[NCHornet]

Having the electrical system checked for a constant draw is a good idea. Where are you getting you alt from? If it is these lifetime warrant units from AZ and the like, that may be your problem. They use the cheapest parts they can find to rebuild them. Try a good alt from DB Electrical next time, they make excellent alt and starters.
NCHornet