A properly installed power cap will reduce noise coming in on the power input. Very few (if any) ppl who install a power cap are doing so to reduce noise but the cap still does it.
Poor grounding is not the only cause of noise. A perfectly grounded system can still pick up noise when the audio wiring acts like antennae.
If the head lights are dimming, a power cap is just a (poor) band-aid and doesn't actually fix the root cause of the problem.
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