UK Ford Repair Questions? Ask a Mechanic for Answers ASAP
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A single click typically means the starter has failed. To know for sure you can monitor battery voltage at both of the wires going to starter, they should both show at least 11v while trying to start. If voltage is good then you know starter needs to be replaced. Let me know if you have questions, thanks.
If starter is new I'd suspect a wiring problem on large wire that goes between battery and starter. If large wire shows less then 11v when trying to start then you will need to clean connections or replace the wire. Let me know if you have more questions, thanks.
You need to start by monitoring voltage at both wires going to starter while trying to start. If small wire has at least 11v but large wire doesn't then you need to clean connections on large wire that connects at battery and at starter. If that doesn't help and voltage is still low then run a new wire.