Can a bad alternator cause overcharging?
Overcharging of the battery by a defective or malfunctioning alternator will result in the battery reaching an overcharged state. When overcharged, the plates inside the battery shed material and lose their capacity to hold electricity.
How high is too high for alternator?
A car alternator needs to be putting out at least 13-14 volts (ideally between 13.8 and 14.2 volts) to effectively charge a 12 volt car battery. If the alternator is putting out too much voltage (15+ volts), it is likely your battery acid will boil over out of the battery.
What can cause an alternator to overcharg?
Discuss the RB20, RB25 and RB26 series engines. Causes of alternator overcharging? Trying to make sure all the small things are fixed before I start driving it again and I noticed my battery light is on. Checked the voltage and with the car on it stays around 18v. Any ideas on what I should check? What can cause this?
Can a bad alternator be found on a running engine?
If only battery voltage is present at the battery on a running engine, does this mean the alternator is “bad?” No, it does not. That only means that the alternator is not charging, but does not reveal why. Therefore, it does not prove a faulty alternator. 1. One Test Is Not Enough
What happens if I lose communication with my alternator?
If communications were lost between the PCM and alternator, the PCM would turn on the battery light, but the regulator would still charge the alternator at about 13.6 volts. The PCM would set a trouble code relating to that loss of communication.
What kind of voltage does an alternator put on a car?
After a bit of research, I started looking into the wires coming from the plug on the side (Sky Blue and White/Red). Even with the plug unplugged, the alternator is still putting 15.5 volts. The Sky Blue in the plug, reads static battery voltage (12.5v), and the White/Red reads .38 volts. Re: Causes of alternator overcharging?