Changing an alternator....how long do they last? YTH2454?

[Alweeja]

My blade will stop turning when it runs(cuts) for a while. I think that is the issue since belts are new.

 

[Fish]

It could be a number of things. What is your model number off of the serial number tag? Usually behind or under the seat.

 

[Rivets]

Check your battery voltage while the engine is running. Should be 12.6+ DCV if charging system is working properly.

 

[bertsmobile1]

Alternators last for decades if the electrical system is not abused .
The No 1 cause for alternator failure is running a mower with a flat battery
The bit that usually fails first is the rectifier / regulator .

Your blades stopping could be either not enough power to energise the clutch coil or a faulty clutch
If the battery is good it should show 12.6 V at rest
So as Rivets mentioned if the system is working properly you should see the battery voltage rise to between 13V & 15 V when the engine is running at full speed
When you turn the blades on the voltage should remain the same .
If it drops then further investigations are needed
And in order to give you good information we need to know which engine is fitted to your mower