HELP! Crappy license plate wiring

[Alberta65]

Originally Posted by TopFuel1966

Remove the bulb from the socket. Clean the inside of the socket housing and then test for continuity to ground. If that checks out then test for 12V DC at the bulb contact in the socket with the headlight switch on. If that checks out replace the bulb.

Excuse my lack of electrical knowledge but how do I test for continuity to the ground? I check the bulb with a multimeter it's fine also if I touch the end of the wire from the light and the bulb it checks out so that part appears to be fine....

Side note it is a halogen bulb and the tail lights are leds would that be creating an issue?
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