Originally Posted by 85/345
Another note about the new alternator I installed. It is not putting out enough amps/volts (not sure which one) according to the guage on the dash.
It is a voltmeter and don't trust the factory gauges; they are good to see a trend, but not really accurate.
Got a good digital meter? Check the output right at the alternator. If you have an isolator you are loosing 1/2v at least there, more through the rest of the harness.
I would use the alternator you have and see how it works. Unless you really drag the house batteries down it will get them back up ok. If you do go with a high output altenator you have to change the wiring to the batteries and the isolator.