On the 300D I rev'd it. No notable change. On the 420 I did not yet.

I do have a direct ground line from the battery to the heat unit. I was considering just running a fused line direct from the battery (power+ground) to get a clean signal.

I have a ground from the amplifier to the chassis ground on the right side of the trunk (near the hinge).

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k