Easier than this... Connect the LED + wire to a constant power source, the - one to a switched one (acc, ignition whatever). You will find both in your car radio harness, or at the ignition switch. Yes the resistor in series is important.
In the past I wasn't a fan of those LED holder (call it whatever you want). In fact I can't remember having installing any. Instead I was just drilling a clean hole (usually with a UniBit step drill bit), then mount the LED behind. This allow to adjust the depth or mount it flush. You can use hot glue to secure it at the end.
In the past I wasn't a fan of those LED holder (call it whatever you want). In fact I can't remember having installing any. Instead I was just drilling a clean hole (usually with a UniBit step drill bit), then mount the LED behind. This allow to adjust the depth or mount it flush. You can use hot glue to secure it at the end.
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