Why won't my Fiat Uno start after a wiper motor repair?

My Fiat Uno was kept in the garage for a minor wiper motor repair. I happened to collect it on the third evening. With the headlights on, the battery discharged within 15 minutes of driving and the lights dimmed. My mechanic advised me to keep the engine running at idle for 30 minutes, but after doing so it did not restart. Now he says the battery must be charged. Please help. Is my mechanic right? What is the solution?

Asked on 20 June 2010 by ameetnaik

Answered by Honest John
Reads to me as if the alternator has failed, or is disconnected.
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