06 Fusion SE 2.3L. AC wasn't working so I took advice from this instructables article and this video to do a quick temporary fix. I attached a 47kOhm resistor to the purple and yellow wires (top 4th & 3rd) as in the video, it didn't fix the AC and I drove a while with the whole blue thing unplugged.

The next day the RR turn signal and RR brake light went out (regular tail lightes work), next day after that the left headlamp went out (signal and fog lights work). Checked fuses under hood, all good. Any advice, what might have happened?

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    So if you remove the resister and plug the blue plug back in does everything work fine? – Ben Jun 16 '16 at 10:32
  • @Ben No. I wonder if the problem was caused by the resistor or by driving with the thing unplugged. – knoedge Jun 16 '16 at 18:29
  • Just tried dis/re-connecting battery, nothing. – knoedge Jun 16 '16 at 20:46
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    Is this manual or auto AC? single or dual zone? can you post a picture of what you did exactly? How are the bulbs themselves? have you tried replacing them? From what it looks like the AC Evap temp sensor shares common wires with a bunch of sensors and certain lights I'd suspect whatever you did damaged the wiring. You're probably going to have to dig into the wiring harness unless the bulbs are just blown. – Ben Jun 16 '16 at 20:58
  • It WAS the bulb (at least for the break and turn signal) thank God. I'm sure headlamp is same but haven't got to that yet. Thanks for asking those questions, I was so convinced it was an wiring/electrical problem that I forgot the most obvious. What a big relief! Thanks again Ben! – knoedge Jun 16 '16 at 22:42

When in doubt, check bulbs. See main comments.

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