'95 K2500 454 TBI Suburban Suspect low charging .... Tonight, I was rolling down the road with headlights on high. I noticed the volt meter was well below 14, near 11.5. With high beams on and AC on max, volt meter down to 11. I felt it should have been much higher (near 14), but question the accuracy of the gauge. I want to test the alternator output with my multimeter. Where is the best place to test output, at alternator or battery? What numbers are acceptable at idle? With revs? Also, is the regulator in the alternator like older GM alternators or in the computer? Any help for a newbie with his first gmt400 alternator/regulator question?