Turn Signal bulb not working properly?

The vehicle listed above is a 3 Quad Coupe. I replaced the left turn signal blinker bulb because it wasn't working. Initially it still came on but did not blink. Now, it does nothing. Inside the car when I signal to turn, the light on my dash blinks rapidly still indicating it's not working. I tried a new bulb several times, used bulb grease, tried to clean the electrical socket, (it looked fine), took it out and reinstalled it so many times and still doesn't work.
When I turn on my emergency flashers, that side does nothing. I don't know what else to do to get it to work again.
I don't know if this is connected to this or not, but my car was not starting properly and almost not starting for the past week. So, I just replaced the battery yesterday. (I think the car has multiple electrical issues anyway before this problem) I have had to replace the battery more times than I should have too. So when I plug in my OBD2 Scanner sensor from FIXED it can't find it so it can't scan the car to tell me the problems. The car is still lagging when I start it and again barely starts after replacing the battery. Oh ya, when I opened the trunk to change the battery, and reached in there, the trunk had water in it. Thats one of the leaks causing my back wheels to rust and I guess its the trunk leaking but no clue where. The other leak was from the rail on the roof/door and was repaired, but the roof liner still gets wet and is coming off. I think there is still an issue there as well. I love my car but these are only a few of the problems I'm having. I don't really want to buy a new car, I can't afford it really. It has a salvage title, has protected me in several little fender bumps, and one car accident where I hit another car, then a deer ran out in front of me and I hit it too! My poor car is falling apart and would love to come and get rehab'd by your team. Thanks so much for your help!