When does the alternator light turn on the battery?
When does the alternator light turn on the battery?
On older vehicles, the battery light would turn on the alternator light when the alternator output or battery voltage dropped below a preset value. The battery light on modern vehicles, however, is controlled by data and trouble codes. This is why a scan tool is essential to diagnosing a charging system.
What causes an alternator to go over base voltage?
If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty. Other potential problems are a faulty voltage regulator or a problem in the charging system wiring.
What causes intermittent Battery Light in my car?
The second area of concern would be a failing regulator in the alternator. This could be intermittent under the right circumstances, causing the light under just the right circumstances. This second is a long shot, but really if the belt, tensioner, and pulleys are in good shape, this is where I’d go next.
Is it normal for an alternator to not charge?
Still, it’s perfectly normal for others to see the alternator not charge at all intermittently. One test is not enough if you are diagnosing a charging system problem. All too often, the alternator is condemned as the source of the problem if only battery voltage is present with the engine running.
Why does the battery light come on when the alternator is on?
If the battery light is on when the voltage is above 13v then something is still wrong with the alternator as the switch for the light is in the alternator. I had this with a Denso alternator on a 2006 Ody. Installed new alternator and it worked great except after about 20 seconds the battery light came on even though charging voltage was 14.5v.
What are the colors of the alternator light?
There’s two signals from the alternator connector that the pcm monitors. Wire colors are Ye-LB and Ye. The other wire is the thick Ob-Lb one that goes to charge the battery. You may have a loose connection in those two wires somewhere between the alternator and the pcm. Start by doing the basic diy’er alternator test first.
What does it mean when Battery Light is on in Honda Odyssey?
Checking the voltage with the battery light on is the key here. If the battery light is on when the voltage is above 13v then something is still wrong with the alternator as the switch for the light is in the alternator. I had this with a Denso alternator on a 2006 Ody.
How can I tell if my alternator or battery is OK?
As with most electrical issues, if you know the battery or alternator is OK (because you had it tested), then diagnosis comes down to tracing and testing for continuity from one portion of the circuit (s) involved to the next.
