Nope, nope, nope! Hold on. I don't want you wasting money on things that might not be needed. It's hard for you to provide enough information over a computer for me to properly diagnose the cause of the problem. I only gave you my best guess based on the symptoms and past experience.
The first thing is to watch the generator's pulley when the engine is running or as a helper is cranking the engine. If the generator is locked up due to a failed bearing, the pulley will not be spinning, and the belt will be sliding over it.
An even faster test is to watch the "Battery" light on the dash. That has to turn on when you turn on the ignition switch, then it must go off once the engine is running. If it does go off, the generator is working and can be eliminated as a suspect.
There's a quick test you can do to tell if the charging system is working, but I don't think we need to look at that, at least at this point. The problem, I believe, is we're looking for the cause of low idle speed. A dead charging system can cause engine running problems, ... And an engine running problem can caused low engine speed which will cause the charging system to stop working. The problem is to figure out which one is causing the other.
If it does come to a need to replace the generator, I'll post a copy of my standard reply to explain why you should replace the battery at the same time.
Saturday, December 26th, 2015 AT 7:04 PM