Chasing parasitic draw

[Taxed1]

I’m chasing parasitic draw, my alt is failing the diode test, maybe. It becomes noticeable if the car sits for 2 days or more. It’s draining my plannano bank. It also did it when I ran Headways. I’ve checked numerous items then I found that I need to check the alt and make sure it’s not bleeding DC. So I ran a diode test on the alt the normal way and the meter reads the normal .564 but once I swap the leads to see if it’s bleeding the meter then reads 2.994. I checked the stock alt and it does not bleed like that. I then decided to test another spare 250amp alt from another vendor that I have as a back up & it did the same thing, failing the test. Is this normal for H/O alts or do I really have 2 bad H/O alts?

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[Old_Slapper]

Disconnect the battery lead at the alternator and see if your power still drains. Or, disconnect everything from the battery so just the battery is connected to the alternator. Then check to see if there is a draw from the battery to the alternator.