Hella LED switches
hmm. I expected a quick expert answer.
There a google images UTUBE, and finding a resistor fir the power to unit middle prong.
Relay use allows 8/10 GA wire from batt to the either control area in Milan or to near the powered unit area...thus reduceing voltage drop.
Aux lights on my van's roof with long wire runs receive near 13V.
The LED is integral.
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