Originally Posted by rads2

I had the same problem on my S, I checked everything and it turned out to be a stupid light bulb. It wasn't burnt, but it was wrong. On the bottom of the bulb you supposed to have two "bumps" like in the picture. I had only one “bump", changed the bulbs and now it's good. Hope this helps, good luck.

Rad

Originally Posted by IceShark

The double filament 5/21 watt bulb above is only used for the front signals. The rear signals use a single filament bulb (or bump on the base as you described it).

I don't know how you jammed in a single filament bulb up front because they have a different bayonet arrangement so people don't make these dumb mistakes.

Originally Posted by rads2

It was the previous owner that installed a single filament bulb, and the bulb fitment was perfect. But anyways, after checking relays, grounds, turn signal switch, hazard lights switch, I decided to change all the bulbs and that's where the problem was. Stupid as it sounds, I could've saved all this work and time if I checked the bulbs first

Originally Posted by IceShark

After replacing your blinker fluid, I'd give the relay a shot.

It is cheap (~$10) and you can get it at any auto parts store. Get an electronic one not the cheaper thermal type. Bring your old relay into the store and buy a replacement that has the same pin/leg configuration and the same leg numbers. Don't get a heavy duty one as those are for pulling trailers, ect., and lighting up a bunch of bulbs. They won't flash at the right speed in our cars.

I suspect the buzzing sound you hear may be the relay. The other thing to check is if the hazzard function works. That is on a seperate circuit inside the relay and if the hazzards do work then the relay is bad for sure, though there may be something else going on due to you monkeying around with the switch.