- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Brother Mark, changing the battery with a new one being done won't make the light go out, as you noticed. Light is still on so you changed the alternator. Good, but the battery light is STILL on. This only means that the charging circuit from the alternator is not working in the voltage regulator or the wiring is not connected properly to the alternator/regulator. A new battery will show over 13 to 13.5 volts not connected. An old battery will still show 12 volts and still be weak or bad. After connected and engine running, the system will show at least 14 volts because alternator/regulator is working properly, using a voltmeter/load tester connected to the battery. If after replacing the battery and alternator it is still reading 12 to 13.5 volts, it is not working and the light will stay lit on the dash. You may have purchased a faulty alternator if the system tests out this way. Have your system checked with a volt meter or load tester bit be sure all the connections are proper and clean.
a bad ground or a alternator going bad will cause what its doing,you need to
have a shop check it though and make sure the dash isn't shorting out. good-day ! to check voltage from alternator-- with car running at battery there should be at least 14.1 volts or more at battery ( check with a voltage meter ). to check battery itself, shut offf car. hook the voltage meter to battery, turn on headlights and if the voltage drops to 10 or lower battery is bad. do the running test with all things turned off. you can also go to a auto parts store and they will test for free. auto-zone etc.
Thanks for choosing FixYa and welcome. It may be, persuming you are speaking of the dash lights. Start the vehicle and pull the hot side battery post. If it dies instantly, your alternator needs changed. Inspect the wires on the alternator to be 100% positive.
CHECK ALTERNATOR DRIVE BELT COULD BE LOOSE NEED ADJUSTING OR GLAZED NEED REPLACING. IF ALL IS GOOD, CHECK ALTERNATOR VOLTAGE OUT PUT AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS. IF NOT ALTERNATOR FAULTY BUT CHECK ALTERNATOR BATTERY FEED AND VOLTAGE REGULATOR WIRES FOR LOOSE CONNECTION OR DAMAGED FRAYED WIRES. CHECK ALTERNATOR FUSE.CHECK THOSE THINGS BEFORE BUYING NEW ALTERNATOR.FIRST TURN OFF RADIO BEFORE DISCONNECTING BATTERY CABLE TO KEEP FROM LOCKING OUT RADIO.
When you say "turn key dash lights go out and all is dead", do the lights come back on when you turn the key back to "off"?
With key off, try turning on your headlights- are they bright?
Flip to high beams-do they get brighter?
**If lights get dim while trying this, it's the battery-(dead/needs charged or replaced-which may have been caused by a bad alternator).
Leave lights on, now turn your ignition switch to "on"-do the lights get dim or go out?
Try and start the car-anything change?
If the lights were fine until you tried to start the car, more than likely your battery terminals need cleaning/tightening.
The lights should at least get dim when you try and start the car but only while the starter turns over: when the engine is running your lights (as well as all your other electrics) are powered by the alternator.
If you do all this and lights are okay all through this procedure, your problem is probably in your starter circuit. (Starter relay, ignition/key switch)
This is usually caused by a faulty alternator.
It stays on because the alternator is not generating sufficient voltage on the control winding to extinguish it.
Check battery terminal voltage while motor running with headlights on or blower fan running.
Terminal voltage should be approx 14.5V.
Ensure alternator and engine are properly connected to ground and the battery negative terminal.
The battery light on at the dash indicates a problem internal in the alternator. Normally, when the alternator is producing sufficient voltage (14.4 VDC), the light stays off. When the alternator is NOT producing sufficient voltage, the light comes on. Check the voltage at the battery with a voltmenter with the engine running. If you have less than 12 volts, you both need an alternator.