charging - Bad ground cause alternator to output low volts?
Measure the voltage across the battery and the big bat alternator terminal to alternator case. There are two things that you are looking for. The charging voltage should be between 13.9v to 14.4v. Also the voltage at the battery and the voltage …
electrical - How to diagnose low alternator output - Motor Vehicle ...
Check the voltage at the output of the alternator when the engine is idling, it should around 14 V in most cars, maybe a bit lower (13.5 ish) if the battery is fully charged or if the alternator pulley doesn't allow full output at idle. As you increase the engine speed the output should go up a bit and peak around 14.2 V.
electrical - Is a 13.07V alternator voltage too low? - Motor Vehicle ...
It could be that the battery has low state of charge. Batteries are charged in two or three stages: Constant current. High constant voltage, over 14 volts. Reduced constant voltage, around 13.5 - 13.8 volts in room temperature. (optional; sometimes high constant voltage might be enough, especially on cars that are not driven 24/7)
Why would turning on the A/C affect my alternator output voltage?
The alternator outputs ~14.5 V with the A/C off. With the A/C on, the alternator outputs 10-12 V, the battery symbol lights up, and a 'Check Alternator' warning shows up on my display. After some time the steering goes hard as well, indicating loss of …
Voltage measurements with the alternator running fluctuate
Nov 12, 2018 · 1) The alternator (built-in regulator) 2) The wiring 3) The battery. We can eliminate three immediately. the car starts on its own and the battery is holding voltage. The alternator is a little more tricky. You are most likely to see problems in the alternator when it's cold and idling, but unfortunately that applies to the wiring as well.
Why can't alternators provide full current at idle?
Jun 28, 2016 · (1) The system draws what current it will draw. As the limits of the supply (alternator) are reached, voltage will drop. As long as system voltage meets or exceeds the battery's open-circuit voltage (something like 13.2V if memory serves), the alternator is meeting load requirement, although there may be nothing left to charge the battery.
electrical - Can a weak battery destroy an alternator? - Motor …
Apr 4, 2016 · The voltage regulator lowers the rotor current to bring the system voltage down. This cat-and-mouse game constantly goes on in the charging system. When an alternator is rated for a particular current output, lets say 100 amps, that rating is at 2000 RPM. The alternator can comfortably make 100A at 2000 RPM.
voltage regulator - Should an alternator ever run over 14.5V?
Feb 19, 2017 · Good alternators measure the voltage at the battery terminals and use whatever voltage at the alternator that is required to obtain good voltage at the battery terminals. So, as a summary, you should be measuring the voltage at the battery terminals. There the voltage should be between 14.1 VDC and 14.5 VDC.
Alternator voltage range - Motor Vehicle Maintenance & Repair …
15.3 is not a high voltage condition for the alternator. The range on the cluster is : 6.2-9.1 volts, low voltage mark and below. 16.9-19.1 volts, high voltage mark and above. However, there is no source for these values. Does anyone if the above is correct? 9.2V seems too low and 16.8V seems very high to be considered normal.
electrical - Can an alternator maintain a good system voltage (14 …
Jul 17, 2019 · The alternator doesn't "allocate" current based on a whim. The current is a function of the difference in potential between battery voltage and alternator output voltage. The current is a result proportional to that voltage delta and the resistance of the charging circuit. The "hunger" of the battery ultimately determines the current, up to the ...