One-wire alternators are internally MORE complex than 2/3 wire alternators and therefore less reliable. This means that there is an issue with wiring. Also the voltage at the battery and the voltage at the alternator should be within 0.5v of each other. Battery positive to Alternator case reading in volts. Is the charge light on?? If it does not then the alternator will not work. No +3. For example the battery reads 12v and alternator reads 14v. It's a GM alternator that accepts both 1 and 3 wire hookups. They have to perform some "magic" with internal voltage-drop or rpm detection; and some days, magic just doesn't work, which is why no manufacturer would ever use a 1-wire alternator. The test indicated that the alternator was not charging at all. Check the battery voltage and note it … Make sure the 3 wire plug is not corroded If things check out at Autozone with the Alternator it is either battery terminals cables or the wire from the B terminal of the alternator or the 3 wire plug poor main ground. Since the alternator was new, they figured it was probably a wiring issue. You should carefully tap the alternator with a hammer when the car is running in order to test the levels and determine if the alternator is at fault. Yes. Here is a link to a detailed explanation: After a lot of research, i'm running a 3 wire and have been the whole time. As soon as the alt is charging, the light will turn OFF. read more Chris (aka- Moose) Also, what is the difference between 1 wire and 3 wire alternator? This time I asked them to run the full test with one battery connected. answer. Check the ground cable between the engine and the body. Disconnect the alternator and check for power at the yellow and red wire do you have it if not check the charge indicator and check bulb relay- Was this . This actually works as the alternator is charging and the ammeter is reading amperage. Problem was that I had the alternator wired to a ground instead of the postive terminal on the battery. The light should be on. Check the serpentine belt and make sure the alternator is spinning with the engine. It is a GM 3-wire alternator. Since the wire from the alternator needed to be hooked to a switched source that did not interfere with the ignition system I hooked it to my electric fan. One of my friend’s trucks is having a charging problem. Check the large power cable to the alternator and the fuse, usually, a large 40-60 amp fuse near the battery. Easy way to test your new wiring is turn the ign switch on but do not start the motor. The way to test if your alternator is damaged is by using a multimeter. helpful? The batteries only showed 12.3 V. I even drove back to advanced auto and had them check the system again. “The 1-wire alternator only has a sense of what it is sending current to, which is the battery. I then also hooked it to the ammeter. The voltage at the battery acts like it is charging at idle, since it is higher then when the truck is shut off, but when you get into the higher RPM’s the voltage drops. The most common reason that your alternator is not charging is because of a damaged alternator. 2000 f350 diesel super duty 7.3 replaced alternator still not charging battery indicator light on dash does not light up no power to alternator fuse under hood. Check the small power supply wire and the charging light wire. The idea is that if the alt in NOT charging and the ign switch in ON, the light will turn ON. The charging voltage should be between 13.9v to 14.4v. If the voltage at the battery and alternator don't match.
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