This likely is going to get into a can of worms, but never one to walk away from such things...

1. Finding high output internally regulated alternators is a tough gig. Various converters use different alternators with different brackets which are difficult (sometimes) to find. If you look on the internet, you'll find that there are Delco-Remy 145 Amp HO, internally regulated alternators, but they have a limited lifetime as they are designed mainly for diesel pickup trucks. The Lees Neville, a 180 amp HO, internally regulated alternator is what you want. However, it is important to carefully check the custom bracket upon which they are mounted. These are typically custom-made and not often made well.

2. If you are replacing house batteries, this is a great time to check the alternator. An alternator should not be putting out full charge all the time...the idea here being that an alternator should charge/rest/charge/rest, you get it. If the house batteries, for example need replacement, it is possible that the alternator may be cooked or on its last legs.

3. The famed DN/50 alternator, found mounted on the front of OTR 8V92 coaches has a lifetime of about 150K miles. Usually the bearings go on them first. If someone tells you that they can 'hear' that it is good, start talking with someone else. These alternators are huge 24 v, three-phase puppies, driven from the camshaft and lubricated by the oil in the engine. In most cases, they are replaced from above, requiring the bedroom flooring to be opened (although they can be replaced from below).

4. Some coaches are dual alternator coaches: One for 12v, the other alternator for 24v.

Alternators (excepting the DN 50 can easily be checked for output. When the DN50 goes, you'll know it.

So there you go as a couple of comments about alternators.

Let the games begin.