Originally Posted by
MoparFreak69
Do NOT do this!!!
The battery is there to mellow out the imperfect voltage signal the alternator puts out. An alternator produces AC voltage that is simply clipped to give a DC type of equivalent signal by the voltage regulator. It does not actually produce a constant battery like DC feed. Your electronics will not like it. It may or may not stay running. It may or may not cause immediate damage, but all it takes is a split second and a module is done.
+1 to that ( sorry Woody )
The best check is to measure the battery voltage with the engine off, should be 12v or a bit better.
Start the engine, voltage should be 14.3-14.8 volts, if not, alternator is not putting out.