The way the carriage gives power to each socket is completely ridiculous. The carriage traces are just 'spring loaded' essentially against the bulb socket, so if you insert a longer base bulb (of same diameter), you end up pushing the socket and carriage trace apart, and the bulb wont get power.
Test for power at the connector, and then check for power in the socket with the bulb REMOVED. My guess is you will see 12v.
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