What is low alternator voltage?
A reading of more than 0.2 volts means trouble. Ideally, the voltage drop across any connection should be zero or less than 0.1 volts. Poor ground connections are an often-overlooked cause of low charging output and alternator failure. Voltage drops on the negative side can cause overcharging.
Is 14.8 volts too high?
Low maintenance batteries 13.2-14.7V is normal. 14.8V is considered overcharging. A bad regulator over charging would most like shoot upwards of 16.0V. State of charge, temperature, age of batteries all have an effect on the charging rate.
Is 14.6 volts too high?
14.8 would start to be a worry (there might be liquid or corrosion on the battery) and 15 volts would be a real concern, but 14.6 is fine. Less than 14.3 would be a “weak” alternator or regulator. Much less than 14.2 at a fast idle is bad wiring, bad alternator or regulator, or a bad connection or fuse link.
What is the regulated voltage from an alternator?
Normal readings should be around 14 volts for a so-called 12-volt system. This is because the voltage output of the alternator must greater than the battery voltage or current will not flow into the battery, which on its own should produce about 12.8 volts when fully charged.
How much should voltage fluctuate on an alternator?
For some alternators, it’s normal to see as low as 13 volts. For some, a constant 13.6 volts is an indication of a problem. For others, it’s normal to see as high as 16 volts for long stretches. Still, it’s perfectly normal for others to see the alternator not charge at all intermittently.
How much voltage to “excite” an alternator?
The maximum output from your alternator should be regulated to between 14.1 and 14.4 volts DC. The voltage regulator’s job is to supply voltage to the battery when it’s not at the nominal level.
What causes low voltage in an alternator?
a low voltage issue would be caused by the alternator not charging or a problem with the battery. That should be easy to figure out if in fact that is the problem.