Just bought a 68 C10! Few questions

[dgheinen]

I love this truck. It's absolutely gorgeous and the previous owner took great care of it. However, two funky things happen with this truck. I noticed the front left turn signal in the grill was burnt out. I replaced it, but it didn't work. When the bulb is in backwards (ie the indexing posts are in backwards, so the bulb won't spin and lock into place) it works! How do I fix this!

Second, when I push the drivers door lock down into the locked position and close the door, the lock pops back up. The key can unlock the lock but doesn't want to lock the door when it's closed. What might cause this? Just lack of lubrication by chance?

Thanks a ton in advance!

Damon