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Q: Loud buzzing before the engine cranks

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The car couldn't start. Before this happened, the cranking was weak. The battery works well and has lots of power. The car can be jump-started with no issues. I had the terminals cleaned as well as the cable ends that had some corrosion on them. I also tightened ends to terminals. Now, when I put the key in the ignition, before the engine starts cranking, I can't hear the clicking sounds anymore. Now, it's buzzing very loudly. What should I do?

This sounds like the starter solenoid - the part of the starter assembly which acts as a high-current power relay for the starter motor - has worn or burned contacts. This makes it tougher to get adequate power to the starter motor itself. A professional mechanic, like one from YourMechanic, can confirm this diagnosis, and replace the starter assembly if needed.

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