Since it was a Vette, it took twice as long.
My (our) mistake was checking the voltage drop on the radio, and assuming it was the same on the HVAC head. The radio was fed battery voltage but was dropped to 9.6V on the circuit board. We calculated the voltage drop for the radio, and installed the correct resistors inline with each LED. We also had to shave the head of the LEDs with a dremmel. (Due to the shape of the LED, they direct their light in a pinpoint method, shaving the head flat allows the LED to spread out the light similar to an incandescent bulb.)
Did the same for the HVAC head; installed all back, turned on the lights and you could see the HVAC unit in broad daylight.
Found the HVAC unit is fed full battery voltage from the BCM. Removed the HVAC head, and figured a new voltage drop requirement, installed larger resistors.
Switches were quite easy, just install a resistor inline with the LED insert in the bulb plug, and install.
As I say, it was fun, but I would NEVER do it again....never I say.
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Black Sheep Hummer Squadron
(ME TOO)
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