- 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.
Testing the electrical circuit's would need to be done to find the problem . Looking at a wiring diagram for the starter electrical circuit ,to see what all is involved in starting the vehicle. First off is the security light lit on the insturment cluster ? Check engine light ? Do you know what a automotive electrical diagram is ? Here is a web site for free wiring diagrams . http://www.bbbind.com/free_tsb.html Enter your vehicle info. Year , make , model etc.... Then click engine under system ,then charging system under subsystem . Click the search button , then the second blue link . This is the starting system wiring . Looking at the diagram you will see there is a bunch of stuff . IGN switch , starter enable relay , park neutral safety switch ,Pass-key 2 theft deterrent module , starter . Knowing how it all works an where to test is the key to fixing a no start problem . Knowing computer controlled system helps too .
If the lights drain the battery when the engine is running, then you have a bigger problem of the alternator not charging, not working. When the engine is running, the alternator supplies all the current to run the car's electrical systems, while also charging up the battery for the next start-up. If you know the alternator is good, then maybe a fuse or fusible link has blown, preventing the alternator from working. To check, put a voltmeter on the battery with engine running-it should show over 13.5 volts if the charging system is working. If the alternator is not putting out, the voltmeter will read same voltage on the battery as when the engine is not running. A fully charged battery should show "around" 12.6 volts. A discharged battery will show less than 12 volts. That should give you an idea of the range to look for on a voltmeter. I believe some parts stores will check the voltage for free. I know most stores will test the alternator and battery for free if brought into the store, but you need the voltage read while on the car and engine running. If the system is charging normally and the lights kill everything, you may have a short in the lighting system.
Warning on alternators never take positive terminal off battery when engine running a good chance you will fry the regulator or diode plate. Usually when the light stays on with ignition off indicates damaged negative diode in the rectifier. Try removing the warning light wire at the alternator if the light goes out this will indicate the above problem. If not then check if there is a charge relay. Please let me know if you have further problem and include more information on your findings.
This warning light comes on when the charging system is NOT producing enough current or voltage to meet your vehicle's electrical needs. The cause may be a failed alternator or generator, a bad battery, a failed voltage regulator (if separate from the alternator), loose or corroded battery cables, or a broken or slipping drive belt. Turn the engine off and check the belt that turns the alternator. Caution: DO NOT get your fingers, clothing or tools near the belt(s) or pulleys while the engine is running. If the belt appears to be intact and is turning the alternator, start the engine, and turn on the headlights. If the lights are dim, it verifies the charging system is not working -- probably due to a failed alternator, battery or other electrical fault.
How do you know the battery is good? If you are sure the battery is good (not sure how you determined this), then you should check the charging system. You can do this by checking battery voltage with engine off, then again with engine running. Voltage should be 1 - 2 volts higher with engine running if charging system is working. This is just a quick check, but will definitely identify a charging system that is not working at all.
Do U have a voltage meter? Read the battery voltage, should be 12 to 14 volts if not, the battery is probably dead. Take it to a Murry's and have them check it out. If the battery is good the alternator is not charging the battery.