My JD L118 won't turn over. I've been starting it with a battery charger. I attach the charger and it tries to turn over. Then I hear an audible "click" and it won't turn over at all.

I disconnect the charger and wait. In about ten second I hear another audible click and it will turn over again. But it never starts.

Any idea what's going on?

The reason I'm using the charger is that my battery always dies. I'm tired of buying batteries. So I think it's safe to assume my alternator is dead. But an alternator isn't involved in starting the L118, so the starting issue must mean I need to replace something else.

Can someone point out what that part would be or how to troubleshoot this?

Thanks so much. This forum is wonderful. -Harv