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Who changed the battery, the owner or a mechanic? Could be corroded/dirty terminals if they weren't cleaned when it was changed.
As @car-man suggests, a process of elimination is required. As well as his suggestion put the headlights on & then turn the key. If the headlights dim, or don't light in the first place, it's a battery/connection/charging issue. If they don't dim then it's a fault getting power to, or the starter motor itself. |
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