Originally Posted by ChuckS
LED lighting means “Light Emitting Diode”... a Diode will ONLY pass current in one direction.
If an LED light fixture is connected reverse polarity it will not work... diodes can only pass current in one direction..
However...some of the newer LED fixtures do have symmetric contact points and in this case the fixture is not polarity sensitive
I'm surprised !!! All of the LED light assemblies/fixtures are MUCH more than just a "diode". Nearly all of the "light fixtures" are operable at a range of input voltages. Most used on RV's will work on voltages from 12 - 28 VDC. They do that by incorporating a "voltage regulator circuit" that changes the input voltage (regardless of range) so the regulator output is 12VDC (or in some, 5VDC).
The input to the voltage regulator circuit is NOT polarity sensitive and the voltage regulator is the circuit within the "LED light fixture" that causes the interference.
Often, changing the input wires will reduce the interference with the stereo. It has no affect on the +/- polarity of the output of the voltage regulator circuit.
Check some of the "LED fixtures" description on any website....
I'll agree with you, if you're talking about a "single LED" as a diode, then that component is polarity sensitive, but a "LED fixture" with multiple LED's, voltage regulator circuits and other various electronic components is not a "simple LED"......