Machine clicks but won't crank: battery, starter or relay?

If you turn the key and hear a single click or rapid clicking but the engine doesn't turn over, the problem is in the starting circuit: the battery, the terminals, the relay, or the starter itself. More often than not, the cause is simpler than the starter.

Listen to the sound

• Rapid repeated clicking: usually a weak battery or loose terminals. The starter tries and drops out.
• One loud click and then nothing: the starter may be stuck or faulty, or getting too little power.
• No sound at all: check the key switch, fuse, starter relay and safety interlock (on most machines the hydraulic lock lever must be in the locked position).

Checks

1. Make sure the hydraulic lock lever is locked and the transmission is in neutral. These interlocks prevent starting.
2. Check the battery terminals: clean off corrosion and tighten them well. This alone fixes many cases.
3. Measure the battery: below 12.2 V (or 24.4 V on a 24 V system) means it's weak. Charge it or try a jump start.
4. Check the starter fuse and relay. Swap the relay with an identical one from the same box to test.
5. Check the ground cable and the main cable to the starter: they must be clean and tight.
6. If everything is fine and the starter only clicks, it most likely needs repair or replacement.

Summary

Start with the simple things: safety interlocks, terminals and the battery. Replace the starter last, after confirming it's getting full power.