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· Visionary
5,664 Posts
Check all fuses, probably you'd have other symptoms if anything is blown but you never know.
Check the terminals in the socket and on the bulb for corrosion, that's often the whole issue.
Test the 2 terminals in the socket, one supplies 12 v for the running light when the key is on, the other supplies 12v only when the brake is activated. If that's not happening then follow that wire back until you find a break or disconnection that's causing the issue.
If these simple checks don't find the cause then you need to find a wiring diagram, if you do post it here if you need some assistance following it, there may or may not be a relay or electronic module involved or it might just be a simple switch circuit.
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