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Re: low volts light stays on
New altenator or junkyard one.if new return it, if junkyard just ignore light as its odds on they will not change it .the red light is caused by the difference in the voltage between input and output voltages .Quick test --start engine and run at 1500rpm disconnect battery and turn everything electrical on and if engine stops then change altenator if it stays running then altenator is OK
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Yes and no.
It sounds like you have a wiring problem.
The alternator output could be 14 volts and only one or two amps, but that would be enough to kill the warning light. Its more likely the alternator is charging but the current is not reaching the battery.
Battery Light usually means the alternator is not charging correctly and needs to be replaced. Check charging volts, it should at 14 volts or very close to that number. If the number is low below 12 then the alternator needs to be replaced.
Note: A bad alternator can damage the battery & vise versa
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.
Sounds like a bad alternator. Drained your battery and when you turned on the lights it took all the power left in your battery. When you drain a battery down that far, they are real hard to jump, and coupled with the alternator, the car is not producing enough current to start and stay running.
I would take the alternator off and take it to oyur local auto parts store to be tested. If bad, replace it and charge the battery fully before starting. Then check voltage at battery with motor running. Should be 13.2 -14 Volts DC. If not, you may have a bad battery cable or blown fusible link. (especially that if the alternator tests good).....Mike
at battery when car is running there should be at least 14 to 14.2 volts. when car is off, at battery there should be at least 13 volts at battery. if alternator is charging and reads 14 volts or a bit higher. and all the belts are tight. you may have a weak battery. check it out! have a good day !!
The charge rate of 14 volt shows that your alternator is responding as it should and is doing its best to recharge the battery. Even with a fully charged battery if you switch on the power hungry electrical items (main headlights, rear window demist heater etc) you should see the alternator respond by pushing out 14+ volts. A low battery will show about 12.2 volts when disconnected.
OK you need to find what is draining your battery when the car is switched off. With the car off disconnect the negative terminal and measure the current flowing between the disconnected cable and the negative terminal, it should very very low, just enough to keep the clock running. If you do have residual current flow, remove and return each fuse one at a time and note each time the current reading. Quite quickly you will be able to isolate the circuit that is causing the drain. Often it is a lighting circuit for an interior light that you cannot see....such as a glove box light not going off when the lid closes or the trunk light staying on. These work by a contact switch being opened by coming into contact with a bracket when shut. If for some reason the bracket gets bent or is dislodged then the light stays on.
If it runs way below 14 volts there is usually a problem, but if at an idle there is alot of amps being drawn in can drop under the 14 volts and be ok. If when drivng with rpms higher and volts stay under 14 volts you should have the alternator checked out. There is no relay for this. Everything that operates the alternator in contain in the alternator.
Its the same system to the light. You could take the car to Sears or an other large auto parts store and ask them to check the chargeing system.They check it for free. Or if you have a volt meter, with the engine running check the volts at the battery. It should be from 12-14 volts. As long as it says 12.5 volts up to 14 volts then your alternator is chargeing and could be you battery is bad.
Perfectly normal. Starting with the 2005 model year, light duty full size pickups and
utilities are equipped with a new Regulated Voltage Control (RVC)
system. This system reduces the targeted output of the generator to
12.6-13.1 volts when in "Fuel Economy Mode" to improve fuel economy.
The generator may exit "Fuel Economy Mode" if additional voltage is
required. This will cause the voltmeter to fluctuate between 12 and 14
volts as opposed to non-regulated systems that usually maintain a more
consistent reading of 14 volts. This fluctuation with the RVC system is
normal system operation and NO repairs should be attempted.