jrkitching said:

How many miles has the car done?

I'm thinking it may just be a sticking brush, in which case removing the starter, dismantling and cleaning may be all that is needed; that will cost you nothing but your time. It could also be a sticking solenoid (they're integral with the motor on most cars these days); the same comment applies.

Starters and alternators can often be made good as new just by cleaning and replacing the brushes for a fraction of the cost of a service exchange unit.

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