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Seems that you have a power drain. If you installed any electronics check to see if the wire has an open section that is bleeding the system.
Check to make sure that when the glove box closes the light in side goes off. A sprung glove door will keep the light on and will drain a battery in about 3 days.
If you put a trailer hitch on the truck make sure that the grounding is done correctly. Lighting harness to trailer, trailer to truck. A poor ground will cause the electrical leak and drain the battery if the trailer in attached for a few day, less than 3.
You would have checked the charging system before replacing the alternator, so I will assume the charging system is good. If the battery is being discharged overnight or over a few days, you would need to disconnect it and check every circuit on the truck to find the drain.
If you disconnect the negative battery cable and connect a 12V test light between the battery negative post and the negative battery cable terminal the light will burn if there's a draw. Make sure all electrical consumers are off and all doors closed when doing this draw test. If the light is on start pulling 1 fuse at a time until the light goes out, when it goes out that's the circuit that has the draw. Trace it from there.
There is a set of Diodes in the Alternator, when these are shot, the battery will drain even though the key is turned off. I went to the auto wreckers and took 4 sets off of other alternators and swap them out when this happens. (about every 5 months) Look for a small plastic cap on your alt. and remove it and the diode set underneath the cap and replace. easy peasy. Good luck.
Use a 12volt test light between the positive battery post and the positive cable with the positive cable disconnected from the battery. Keep key off. You will see the test light "light" with any drain.
Any drain showing a dim test light is..... OK Any drain showing a bright light is.....BAD
Disconnect items (fuses) one at a time and watch the light. Keep the doors closed....the inside dome light is a drain with the door open! After fuses are checked....disconnect the alt if needed and watch the light. Keep going until you get rid of the bright light.
Hi. this is defiantly a slow or major drain that is occurring within this vehicle. Here is a test that you can preform that will help you find this battery drain so you can illuminate this issue.
--BATTERY DRAINAGE TEST PROCEDURE--
Using a 12-volt test light, hook one end to the negative battery post the other
end to the negative battery cable you just disconnected. The test light will glow
or "light" if there is a drain. If the "light or glow" is faint, that is probably
normal draw for the clock or computer. If the "light or glow" is bright, then there
is a large drain. That should be corrected. Now start removing and replacing the
fuses one by one until the light goes out; that one will be the circuit with the
drain. Remember to hold in the button in the door jam for the interior lights.