Just upgraded to the Al129x alternator. Upgraded the alternator wiring to 4ga. and connected it directly to the battery. Its putting out 15.4 V at idle and stays that way at higher rpm. With the AC blower, condenser fan and lights on, it goes down to 14.4 V. Is this normal for the alternator?

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles