Most single leds run on either 3.3 volts or 2.0 volts. If you plug them into 12vdc they are destroyed in about 1/10th of a second.

Red leds are 2.0VDC units while all others are 3.3v

A 500 ohm 1/8W resistor usually works good.

The glass can be gently pulled out. Under it you will find that the two leads
are soldered in place with a resistor. Snip the leads to fit and solder your led in. Makes no difference which side goes to the resistor.

Carefully to insure NO shorts, push the led into the housing. Insert housing into your cluster and try it. If it doesnt work, pull it out and reverse it.

The turn signals on my 123 can be seen verrrrry easily standing by the rear bumper.

__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."