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will see a voltage on the outside of the RCA shell when you lower the PWM output.
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I agree that if a dewstrap is fitted, the outer shell can become live when the unit turns off, but its also much harder to short it.
I have actually seen low side units where the outer shell ( in the controller ) was wired to 12V
, hence was always live, even when not connected.
I only use proper 2.5mm DC connectors on my units, just to avoid this.
Andrew