Looking for some help with a front diff not engaging on a 2021 Turbo S4, 1600 miles. Diff wouldn't lock 99% of the time. Voltage to the diff tested spot on. But the amp draw seems low at 0.5 amps +/-. Ran power directly to a separate fully charged battery to isolate the issue to the diff only. Amp draw is the same. Electromagnet ohms at 22.3. Removed the diff to inspect internals. Every component inside is very clean and no visible blemishes on anything. The only thing I notice is how weak the magnet is. I can easily spin the armature plate with two fingers with a 13v battery directly connected. There is no way that the armature has enough magnetic strength to overcome the return springs. This must be a weak armature magnet. Can anyone tell me what amperage I should be seeing on a known good armature when energized? I’d really appreciate any advice, comments, or technical assistance before I drop some dollars on this thing.