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Integrated into the alternator.
The voltage regulator for a 300e Mercedes is mounted on the rear of the alternator. The regulator is a replaceable item, independent from the alternator.
on alternator
The voltage regulator is located in the Single Board Engine Controller (SBEC or ECM). If you have to replace it, you have to replace the computer. The computer has the voltage regulator in it. The alternator gets feedback from the computer to produce more of less voltage.
I/C regulator built inside alternator.
The voltage regulator is built into the alternator.
Inside the alternator
It is built into the alternator.
Inside the alternator
It is inside the alternator.
Inside the alternator
The engine computer is also the regulator.