If you notice your Ford Focuss turn signal isn't working properly; the first thing that comes to mind is that it has a bad light bulb. However, it may be the turn signal relay malfunctioning and it needs replacement. Performing this task is relatively simple where the only skill you need is the ability to use a screwdriver and follow some simple directions.
Locate the relay cluster in your Ford Focus. Depending on the year model, it's in one of two places. It's either on the bottom underside of the steering column or on the left, driver's side foot well.
Use a flathead screwdriver to remove the fuse panel from the foot well or the underneath panel below the steering column. Be careful not to use too much pressure when you pry the panel open. There should be a small indentation, which makes opening the panel with a screwdriver much easier.
Find the turn signal relay and pull it out of the relay box. Make certain that you remove it carefully, as you can damage the other relays and fuses near it. In the Ford Focus, the turn signal relay is on the right side about two or three places down from the top of the box depending on the year model.
Put the new turn signal relay into the space occupied by the old one. It will only fit one way, so you need not worry about placing it in the wrong way.
Check to make sure the turn signal works before you replace the relay panel. Replace the relay panel and verify it's securely closed.
On some year models of the Ford Focus, you may need to unscrew a separate panel cover underneath the steering column before you can access the relay panel.