I have a Failing Alternator
If you find that your big rig won’t start, then your starter has gone bad; but if your engine is slow to crank, and you hear odd noises coming from your engine, then chances are you have a failing alternator. While failing parts is never a good sign, the good news is that you may have just enough energy to run to a service station.
Reconsider your actions if you plan to ignore that illuminating battery warning light. Here’s what will happen if you drive with a bad alternator for too long.