2001 CLK320

The left turn signal is on all the time with the signal switch in the left and neutral positions. Turning the switch to the right position works properly and makes the right side signals blink, and stops the left side blinking.

I disconnected and reconnected the battery - it made no difference.

I had a quick look for relays and could find only one in the trunk, north east of the spare wheel.

The stalk switch is solid and has no looseness or sloppiness.

What could cause this problem?

Where are the relays in this car, and where is the flasher unit?

In case the problem is the stalk switch, is disconnecting the battery enough to stop the air bag popping in may face before removing the steering wheel?

Please help. The car is undriveable in this condition unless I remove front and rear bulbs and duct tape the light on the door mirror.

Thanks