Step 2Prepare LED Unit for Installation...
Remove lens - this may require a few minutes with a rotary tool if the unit is sealed.
Identify the Positive lead and the ground, or negative lead or contact.
Test the unit to make sure it works prior to installation.
If you're unfamiliar with how most automotive interior lights work, you may want to pay attention here... Most vehicles use negative or ground switching for interior lights. So when you open the door, that little button switch that turns on the light actually provides a path to ground, or the negative side of the battery. If your light has a sliding switch like mine, that switch is probably providing two possible paths to ground; through the door switch and directly to ground, thus providing light when the door is closed on demand. Slidinng the switch to the OFF position, simply blocks any path to ground or the negative side of the battery. (More about this in the next step)
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