Hard Starting, Replaced Battery & still show 14 + volts charging
2004 350Z - After I replaced the battery due to hard starting issue. I still have 14+ volts showing as charging on my gauge. I don't know why it is still showing that its charging since its a new battery. Could someone let me know what the problem is?
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Battery cables ? Hard to say for sure Cassandra ,Would need to do so electrical testing ! Do you own a DVOM - digital volt ohm meter ? There are videos on youtube showing how to do basic automotive electrical testing ! First one I would do is voltage drop testing the starting circuit , charging system ! Voltage Drop Test
That is definitely wrong, not normal. Voltage should stay at 14 volts or near that until the battery is close to fully charged, then will slide down to about 13.5 volts, and stay there while engine is running. Also, a fully charged battery should show about 12.6 volts at a minimum, especially a new battery.
I don't know what is going on with your system. Take it back to Merc- were they aware of how it is acting, voltage-wise? Doesn't sound like it. One small possibility: is your alternator belt not tight enough?
Clean battery connections, and/or check the battery to see if it retains a full charge. Fully charged batteries are normally holding a 13volt charge, and up to 14.5 volts will show on a gauge during charging
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
probably the alternator, when you replaced the battery it had a full charge and once the vehicle used all that charge up and it wasn't charging it could no longer start the car anymore. If your battery light is on in the car it is a fairly certain sign that the alternator is not charging. Generally an AVR test is the best way to check the alternator, but if you can jump start the vehicle, connect a voltmeter to the battery it should be around 14 volts when the vehicle is running and around 12 volts when the vehicle is not running. If it is not at 14 volts when it is running, it is not charging.
well running the voltage from alternator should be at least 14 volts or a bit higher, engine off it should read at least 13 volts at battery. if alternater is less then 14 volts, it is the alternator at fault. or a loose alt, belt.
Battery are in most case only good for 4 years and after that they can no longer hold a charge. Have the truck boosted to start the engine, you may need to let the battery charge up for 120 min before trying to start the truck.
Once started, check the voltage at the battery, you should have a reading of 13.5 to 14 volts. If you have less then 13.5 volts, you most likely have a bad alternator and needs to be replaced.
If your readings are good and there is 13.5 volts, your battery is bad and needs to be replace. The battery can no longer hold a charge and at worst there is a short in the battery it self causing it to loose charge like leaving a light on.
Thank you for using fixya and good luck.
check the battery with a volt meter. Place the probes from the meter inverted which means positive from the meter to negative on the battery and negative from the meter to the positive one the battery. MAKE SURE YOU STE THE METER TO THE DC & NOT TO THE AC MODE BEFORE YOU TURN THE METER ON. Now start the engine and see if a reading shows of 14 - 15 volts. If so the diode is bad in the altenator. The diode suppose to keep the current running only one way. If the current is running both directions the altenator does not charge the battery completely and the battery light will come on this way also
So what you saying is it's hard to start cold right? Something in computer system not allowing excess fuel to injectors when cold. Probably sensor Get auto electrician to sort it out otherwise you end up replacing things that there is nothing wrong with They got the right gear