There is a simple test to check the battey. With the headlights on, try and start the car. If the headlights go out the battery is weak and should be replaced. If they stay on then suspect the starter is bad. Another thing it might be is the start relay or fuse. Refer to your owners manual for the specific location of these items.
Loose battery cable? Bad starter? ( checkwires on starter) Bad starter solenoid? Bad Neutral or clutch safety switch?
Follow the positive cable from the battery, it will lead right to the starter.
Make sure you have a good earth ground between the body of the car, the engine block and the battery.
Loose or corroded battery cables? Seized engine? Bad starter solenoid? Bad starter? Bad neutral or clutch safety switch?
Bad Battery: the clicking is the starter solenoid relay making contact but the battery is not putting out enough amps to turn the starter
Fault with new starter motor Fault with immoboliser Fault with ignition switch or wiring Low battery charge Loose terminals battery/starter motor Bad engine earth.
Do the headlamps work while cranking the starter? If not focus on your battery and cables. Jump start the car and have the system tested before you throw more dollar bills at this problem; it could be the alternator but have it tested first.
starter relay replace starter relay I am not sure but you may have to replace the starter
Check if there is voltage to the starter "S" terminal (if starter does not have the small wire, ensure the starter relay is working). Go from there
Begin by removing the positive cable from your battery. Remove the cables from the front of the starter. Remove the starter retaining bolts. Reverse the process to install your new Ford starter.
have the alternator checked. sounds like it is not producing enough current to run when at idle. also have battery checked as a bad alternator can trash a battery
A Ford Focus fuse diagram will show the placement of all fuses for the vehicle including the brake and headlights, the interior lights, and the dashboard lights. This diagram is generally located on the inside cover of the fuse box.