I recently replaced the OEM battery in my 2003 Ranger because it was dead.
Now my new one is dead for the second straight morning.
I had gotten it tested and everything is normal, no alternator prob.
I left no lights on, door ajar, etc.
Any ideas from anyone?

 

I don't know how,
but I think I've narrowed it down to the AC clutch.
With the AC on or off the compressor runs.

 

It's normal for your AC compressor to run in heat/defrost modes.

Sounds like you have a large current drain on your battery when your engine is off. To try and isolate it, remove your negative battery cable, and place a test light between the negative battery terminal, and the negative battery cable. With a significant current, the test light will be bright. Start pulling fuses one at a time to try and isolate the circuit pulling the current. When you find it, the test light will dim.

 

i had the same prob but mine was my radio wuld turn on randomly so i got a new one an it fixed it

 

Thanx for the info.

I will def. try to isolate and figure out where the power is being drained.

Thank you for your time.
I'll post here again when all is said and done.