Free printableElectrical and wiringTSP-EL-03
Scooter starter clicks but will not turn over
One mechanical check first, then three electrical ones. The click itself tells you more than most people realise.
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TSP-EL-03 · version v1.0 · September 2026. Opens in your browser's PDF viewer, where you can print directly.
The problem it solves
A click is the solenoid closing with not enough current behind it to turn the engine — which means the fault is almost never the solenoid itself. It is usually the battery, a connection, or something that means the engine cannot turn at all. Replacing the starter motor is the common response and rarely the answer.
The single most useful thing about this fault is that the click is informative. It means the control circuit worked: the key, the kill switch, the brake-lever switch and the solenoid coil all did their jobs. What failed is the heavy current path, or the engine's ability to turn.
That is why the first check on this sheet is not electrical at all. If the engine will not turn by kickstart or by hand, no amount of electrical diagnosis matters — you have a mechanical fault wearing an electrical costume, and continuing to press the button will damage something.
After that it is three checks in order of likelihood and cost, ending with a direct feed to the starter, which either spins or does not and settles the question.
The mistakes this sheet exists to prevent
- Buying a starter motor before checking that the engine can be turned by hand.
- Replacing the solenoid because it clicks. A click means the solenoid is working.
- Jump-starting from a running car, which puts a charging system's output into a small scooter's electrics.
- Cleaning the battery terminals and not the earth strap, which is the connection that usually fails.
- Repeatedly pressing the button on a hydraulicked or seized engine.
Who it is for
- Anyone whose starter clicks and does nothing else
- Owners whose lights dim heavily when the button is pressed
- Anyone about to buy a starter motor
What is on it
- The mechanical check that must come first
- What the lights do at the moment of the click, and what it tells you
- The solenoid bridge test, with its safety caveat
- A direct-feed test that settles whether the starter itself is alive
How to use it
- 01Do the kickstart or turn-by-hand check first. If the engine will not turn, stop.
- 02Watch the lights at the moment you press the button — that observation is free and decisive.
- 03Clean the earth strap as well as the battery terminals.
- 04Only bridge the solenoid with the machine secure and out of gear equivalent, and expect a spark.
Also in a pack
Use it with the registry
Other sheets you may want
- Battery and charging system test sheetThree voltage readings diagnose most electrical faults on these machines. Two thresholds are sourced; the rest is direction of change.
- Chinese scooter won't start: diagnostic chartA structured way through the four things an engine needs, ending at an observation you can make rather than a part you should buy.
- GY6 wiring colour and continuity notes sheetThere is no universal wiring colour standard on these machines. This sheet records the one your machine actually uses.
Free to print, copy, and share — including in forums, clubs and workshops. If you find a mistake on this sheet, tell us and it gets corrected. Quote TSP-EL-03 and the version so we know exactly which sheet you mean. All printables.