Battery Drain-What have i forgot to check?

[Arl37]

Before tearing into my 69 C10 for a rebuild no battery drain. After pulling clip and going through dash, upon reinstall I had a 1.5V drain on a multimeter. Disconnecting the red wire to the Alternator drops it to .25. I have removed all fuses one at a time and retested. removed big wire to starter. removed plugs at headlights and ignition. Still have .25V draw. checked all my grounds. Any thoughts would be appreciated.
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