if its flashing on one side the flasher is good. the bulb should be a 1157 or like that and is a double element bulb. if you get it in wrong like duck says it can mess with things. bad ground will also mess with it and i have found that to be the problem on a few of my cars.

 

something to look at

 

ok sorry didnt relize it was flashing good on one side check that you have the correct bulbs and then check your grounds

 

problem solved.. it was a bad ground in the socket, just had to open the connector up a little to get a better connection thanks again everyone...