Actually in my case I think having the resistor backwards was my problem, the first time I did it to my switch sometimes work sometimes not...but then it was barely working and then it just stop working at all, but after I realized my resistor was backwards I replaced the led and the resistor, I soldered the led to the resistor, problem fixed...I have not changed out my other lights for LED's yet. The dimmer does not effect the brightness of the LED when i have the pins connected to a battery. The ground that the LED/Light is connected to do you know if that only grounds the LED/light for the switch? I don't even know where to start, it just boggles my mind that i can make it work by connecting the switches pins to a battery but not in any harness... If my resistor is backwards i shouldn't get anything out of the LED at all correct? I soldered the resistor/LED to the same metal casing as shown in the DIY as it was way too hard to wire the positive to where it originally came from.
This is not true.Also, try not to move the dim function on the switch, if you already changed all your light in your car for led ones, then you shouldn´t need the dim...leave it at max...remember leds should not be opperated with dim functions...it´s not good for them.
Also, you cannot install resistors "backwards". I would suggest you stop dispensing electrical advice.Actually in my case I think having the resistor backwards was my problem