Hi,
It is very possible that you got a faulty one. There are diodes that are designed to only allow power to travel in one direction. If they are bad, it will drain the battery,
Do this. Charge the battery and remove the 80amp main fuse to the alternator overnight. In the morning, reinstall the fuse and see if the battery is dead.
Also, you could disconnect the alternator. If you do, note that power is direct to the alternator at all times, so don't let anything short. The fuse would just be easier. LOL
I attached the charging system electrical circuit schematic so that you have a reference. See pics 1 and 2. Pic 3 shows the fuse in the under-hood fuse box to remove.
Let me know what you find.
Take care,
Joe
See pics below.
Images (Click to make bigger)
SPONSORED LINKS
Wednesday, May 24th, 2023 AT 9:10 PM