Starter clicks but won't turn: what to check

A click with no cranking almost always means not enough current is reaching the starter. In November's cold the battery is the first thing to fail, so start there.

• Switch the ignition on and watch the dash: if the display dims or goes out when you press the button, the battery is flat or weak.
• Measure battery voltage with a multimeter: a charged battery at rest shows about 12.6 V, and below 12 V there isn't enough charge for the starter.
• Inspect the terminals: corrosion, white deposits or a loose clamp cause clicking even with a good battery. Remove, clean, tighten.
• Check the ground: the cable from the battery to the frame and engine, and any corrosion on the contacts.
• Try starting from another power source or a charged battery. If the engine turns, the problem is the battery or terminals.
• If the battery and contacts are fine and it still clicks, the starter relay or the starter itself is likely at fault. That is electrical work: take it to a workshop.