left turn light blinks extremely slow at a stop when the amps are being pulled by the fans and headlight, yet the right one blinks perfectly fine. Sometimes it even stops blinking alltogether and just stays solid...

Also with the headlight on, my passenger side turn light does not work, it only blinks when I put the signal on

 

 

neither of my marker/ turn lights work on my fenders... could that be it?

 

It could. The rate of flash depends partly on how much current is being pulled through it. If it is not loaded up properly, it won't flash as quickly. I'm pretty sure it operates on the same principle as a christmas light flasher... a strip of metal changes shape as it heats up due to the current flowing through it. When it reaches a cetain temperature, it springs away from the contacts and the circuit is incomplete. It cools, returning to the original shape, and the circuit is complete again..... So you can see how having a smaller load would effect the rate at which the metal heats up. Somebody correct me im wrong.