I order a new alternator and put it in tonight. No problem. The alternator should be tested with the engine idling and electrical accessories, such as the radio and headlights, turned off. A reduced output may be a sign that the alternator is failing, but the drive belt and wiring should be inspected before replacing the alternator. Sure enough- 11.5 volts across the terminals with the car running. 07 Tacoma DCLB 4X4 172K Batt checked out fine, but the alternator was only reading 13.02 volts. I figure the brake light is on because the ABS system has always had a tough time functioning at 12 volts. OK, checked the output tonight while revving engine between 1500-2000 rpm alternator only putting out 13.6. Even worst-case, with all accessories turned on, there should be at least 13 volts No change in function. At idol speed 12.8. Under that and the car installation and battery isnt getting enough electric power. Your alternator could have bad diodes and is putting out AC voltage However after doing some researching online it sounds as if my voltage regulator might be kaput. Alternator is only putting out 12.5 v under load at idle, if I install a high output alternator will that take care of my problem, battery keeps draining in about a week after having it charged or replaced and has new alternator, or what else could my problem be? 2007 F350 Crew Cab Dually FX4 :ford: thanks Nick An alternator should put out between 13.5 and 15 volts of power. Started it and put volt meter on alternator and watched it climb up to 13.5 volts over about 5 seconds after start, read 13.35 at batteries. 2010 Altima SR 3.5 Had the car a little over 2 years. The battery is only a few months old, so I check the voltage. is that normal for a Altima? I have a new battery and just put a new reman alternator in and checked the voltage and I was getting 13.5-14.0. A good alternator should maintain battery voltage between 13.9 and 14.8 volts (14.2 is optimum). The car is 2003 Crown Victoria with about 100,000 miles. I originally thought I just needed brushes since the symptoms are simply that the lights dim down at idle and things of that nature. Do I need to replace the alternator? Take a reading: 13.5 volts to 14.5 volts is OK! Volts so it was working good. A bench test can single out the faulty part. BUT the alternator only puts out 13.2V at idle. Had to jump it twice the battery had a lot of corrosion around the + terminal . The alt may be putting out 13.5 volts, which is what mine puts out during a heavier load, but try turning on your high beams and heater on high, then take a reading and see what alt is making. Turned it off 30 minutes later I got in it to go somewhere and it was still charging good, didnt get 5 miles down the road and the battery light came back on and its not charging again. A few days later, I checked the voltage of the battery while the engine was running, and I got 13.8V. Truck running, warming up, voltage dropped over about 5 minutes to 12.41+/- volts at both batteries and back of alternator. Over 14.5 volts can cause serious damage to the alternator and car battery. 13.5 volts is the bare minimum. Voltage also same on both wires on plug at back of alternator. The other car I have, which had a new alternator put in about 30,000miles ago showed 14.2V - 14.4V, when its engine was running. I replaced the battery. A dead battery after putting in a new one and output alternator voltage showing 13+ volts points to a bad diode or two.
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