Halogen to LED - Resistors and Tazer Programming

[DFWJTR]

Resistor is voltage in minus drop of the resistor = voltage out. So as what's coming in fluctuates, so will the output.
I suppose they could use very specific diodes in parallel to achieve the desired increase in current flow and stabilize the voltage a bit.
But a resistor in parallel to increase the flow through the circuit to emulate an incandescent bulb- I can't see that being a stabilizing factor for the voltage at the LED.

I'd have to look at the specs, but I believe the tail and certain other lights are regulated to something a bit over 13 volts.
Otherwise with the wide voltage swings these charging systems can see, some days lights would be super-bright and others much dimmer.

I understand the resistance and how it works both ways. I would say that electrical is my weakest link. I just absolutely hate anything related to electrical engineering and diagnosis. Some say you don’t need resistors if you change settings. Some say that their aftermarket lighting, even with resistors was not plug and play. I simply left everything as-is. The Tazer happened to take care of some pulsing in the fogs and tail lights, as I saw this suggestion and solution on another Jeep forum. My lights are consistently bright no matter what the charging system is doing. The systems on these Jeeps are very fickle and sensitive. I’ll just choose to call it magic and say that I got lucky.

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[ShadowsPapa]

Some say you don’t need resistors if you change settings. Some say that their aftermarket lighting, even with resistors was not plug and play.

You did what worked - find the right combination that the Jeep was happy with.
Resistors have a =/- tolerance. more expensive resistors have a really tight tolerance, others can vary where a 200 ohm resistor is from 180 to 220 (rough figures, so the EEs please cut some slack LOL)
One guy might find it works fine, the next has to do it differently. Nothing wrong with that, unless you are an EE, then there's no excuse for not knowing.