M102 engine grounds

[patrickcline]

Hello,
I'm new to the forum. I have a question. Where can I find the grounding points for the M102 engine? The car is a W201. I need to check those for the audio system to ensure that the alternator is working properly.

[hennse]

In my w201 m102 there is one under transmission bolt, and one in intake manifold. Near power steering fluid reservoir.