Another way to check your alternator is hook up your multi meter to your battery and start engine and if it's charging the voltage will climb to around 14-15 volts if it's charging correctly if it decreases it's bad
But what if battery is also bad. My battery says 11.5 volts 100% charge when off then when I turn car on it says 12.5 volts 57% charge.. how do I know if it's just battery that is bad or both battery and alternator in this case. ... I can't seem to reach my alternator with volt meter to Check it like this guy did.. any advice??
@@hatersgotohell627 You don't have to have your voltmeter on your alternator to check it like I said you hook to battery since it charges it and if your battery is holding 11.5 volts it should be alright with your voltmeter hooked to your battery while running it should show up to 13-15 volts and then turn your engine off and leave voltmeter hooked up and see if it holds a charge of 11-12 volts and both alternator and battery should be good 👍
@@adik9441 I had a battery one time that would charge but it wouldn't hold a charge when it sit over night it would lose the charge all the way down to 9 volts I found out the battery had a dead cell and had to replace it
why would an alternator need voltage to work ? it actually produce the voltage . you start the engine with the battery voltage, which make the serpentine belt turn and making the alternator pulley rotate and send voltage TO the battery and all components of the car. im pretty sure the 12v cable you test is the cable that GIVE the voltage to the battery. if alternator not running you basically just get the battery voltage through that cable. battery must be between 12.2v (60%)and 12.6v(100%). when engine is running you get the alternator voltage which must be over 13v but around 14v is what you looking for. the test you shown could have been done on the battery itself and would get the same value.
Nice video! For some reason my alternator stopped charging my battery but my battery is new and tested my alternator at autozone and it was good.However, I’ve checked my battery to alternator power wire and come to realize it reads no volts could this be the reason why it’s not charging? Thanks.
@@pdfilmz_8366 you need to test the wire with a multimeter. Here’s a video I did showing how. ruclips.net/video/714_57IRwkk/видео.htmlsi=kvtaqFBtLPYI0YZL
@@pdfilmz_8366 disconnect the battery and then set your multimeter to ohms and put one test lead on one end and the other on the other end. It should be close to 0 ohm anything past .9 ohms is something to look into. Remember to test your leads first and substract that from whatever number you get of the wires
So if it is only reading 13.2 then its bad? Unfortunately my headlights are flickering and so i started checking the alt and my car runs fine but healights flicker. Not bad flickering but flickering. Also the car sometimes doesnt start right away And everytime that occurs the head unit is booting up, telling me somehow electric was completely disconnected. My battery is good and very strong....weird stuff.
@@johngoodwin5739 This is only a 60 sec short from a full video. Short videos are cropped. If you click the thumbnail at the bottom right corner of the short video it will access the full video which explains and shows everything.
@@asincere7015 This is only a 59 sec short video. You’re supposed to watch the full video as the description says. Click the thumbnail at the bottom of the short video to access the full video.
@@PhillipsVisionOne of my positive cable that goes to fuse box was loose and was melting the plastic around it till I thighted. It up would that mean that strand of wires is no longer able to handle the same amount of current thru it & should be replaced, I’m asking due to the fact my Indash aftermarket stereo has an obd2 Bluetooth assory & it reads from 12.6 - 11.3 even seen as low as 10.4 volts also running 2 10” kicker subwoofers!
update so on the TC there are two field wires connecting to back of alternator one is red and other is brown put a meter to red one when cars on and it reads 8.6 volts when I check the brown wire I get nothing.
@@Ivan-qc1kg that’s way too low. If the alternator is working it should be around 14volts under load. Your alternator might be bad or the ground is not good.
@@aaronmillican8500 if the battery is fully charged the alternator will not be charging, so you should have around 12.7volts. If the battery starts dropping below 12.7volts and does not start to recharge, the alternator may be bad. Most automotive parts stores will test it for free.
i jumped a car off and that's when all this happened. the battery and the alternator is brand new, right now with the car off the volts are 12.45, after crank it drops to a constant 12.25 with no accessories on, with lights, ac and window wipers on it drops to 11.6. also the 100 and 40 amp fuses are good, i think i just got a bad alt. out the box.
@@PhillipsVision Aw man, just put this one in too, would you also recommend going with one that’s not remanufactured? I’ve heard those suck, and I believe that is what I got, it’s definitely aftermarket
Another way to check your alternator is hook up your multi meter to your battery and start engine and if it's charging the voltage will climb to around 14-15 volts if it's charging correctly if it decreases it's bad
But what if battery is also bad. My battery says 11.5 volts 100% charge when off then when I turn car on it says 12.5 volts 57% charge.. how do I know if it's just battery that is bad or both battery and alternator in this case. ... I can't seem to reach my alternator with volt meter to Check it like this guy did.. any advice??
@@hatersgotohell627 You don't have to have your voltmeter on your alternator to check it like I said you hook to battery since it charges it and if your battery is holding 11.5 volts it should be alright with your voltmeter hooked to your battery while running it should show up to 13-15 volts and then turn your engine off and leave voltmeter hooked up and see if it holds a charge of 11-12 volts and both alternator and battery should be good 👍
My alternator voltage as seen in obd scanner is 13.5 V ie 2.25 v per cell , is it ok or not as im facing battery discharge
@@adik9441 I had a battery one time that would charge but it wouldn't hold a charge when it sit over night it would lose the charge all the way down to 9 volts I found out the battery had a dead cell and had to replace it
@@terryhill4732 thank you
why would an alternator need voltage to work ? it actually produce the voltage . you start the engine with the battery voltage, which make the serpentine belt turn and making the alternator pulley rotate and send voltage TO the battery and all components of the car. im pretty sure the 12v cable you test is the cable that GIVE the voltage to the battery. if alternator not running you basically just get the battery voltage through that cable. battery must be between 12.2v (60%)and 12.6v(100%). when engine is running you get the alternator voltage which must be over 13v but around 14v is what you looking for. the test you shown could have been done on the battery itself and would get the same value.
all alternators need to be excited before they start charging
Nice video! For some reason my alternator stopped charging my battery but my battery is new and tested my alternator at autozone and it was good.However, I’ve checked my battery to alternator power wire and come to realize it reads no volts could this be the reason why it’s not charging? Thanks.
Yes, may have a break in it
How can you find the break@@PhillipsVision
@@pdfilmz_8366 you need to test the wire with a multimeter. Here’s a video I did showing how. ruclips.net/video/714_57IRwkk/видео.htmlsi=kvtaqFBtLPYI0YZL
@@pdfilmz_8366 disconnect the battery and then set your multimeter to ohms and put one test lead on one end and the other on the other end. It should be close to 0 ohm anything past .9 ohms is something to look into. Remember to test your leads first and substract that from whatever number you get of the wires
@@isaacsamuel325 just do a continuity check on cable
How do you check the 110v alternating current before it hits the regulator and trio diode
Bruh
You’re checking to connect to ensure CURRENT can flow from the alternator TO the battery and the rest of the vehicle
I get 0 volts when engines off, but when it’s on and running I get the 13-14v of current? Time for a new alternator?
@@Ep1K0nE if you’re getting 13-14v then the alternator is working. What are you getting at the battery with car running and off?
💡👌
when i start it goes all the way down to 0.9 Volts. a new altenator it is i guess
Sounds like it, here is the link to my full video: ruclips.net/video/X2EQTJ5ol58/видео.htmlsi=01B1QorqDi30o_Cd
Sparks started to accumulate when I turned on the power
Another test to see if it’s bad with the car on disconnect negative battery cable if it shuts off your alternator is bad
@@zuriiiii77pretty sure it’s suppose to be the positive side not negative.
@@Mordorer it’s negative
@@zuriiiii77 do you remove both or just the negative?
Thanks for your reply. I’m always learning.
@@Mordorer just the negative while car is running if it shuts of it’s the alternator
So if it is only reading 13.2 then its bad? Unfortunately my headlights are flickering and so i started checking the alt and my car runs fine but healights flicker. Not bad flickering but flickering. Also the car sometimes doesnt start right away And everytime that occurs the head unit is booting up, telling me somehow electric was completely disconnected. My battery is good and very strong....weird stuff.
If it's over 12.8 that's OK. 14 is ideal. Gonna guess it's been fine in the month or so you posted.
Did you test it while on
@@zuriiiii77 it was a bad connection directly from the alt
Dude, I can’t even see what you’re doing? What are you connecting to?
@@johngoodwin5739 This is only a 60 sec short from a full video. Short videos are cropped. If you click the thumbnail at the bottom right corner of the short video it will access the full video which explains and shows everything.
@@PhillipsVision Okay…thanks!
You need to redo that video because it doesn't show the alternator information
@@asincere7015 This is only a 59 sec short video. You’re supposed to watch the full video as the description says. Click the thumbnail at the bottom of the short video to access the full video.
@@PhillipsVision Thank you , 👍
Mine reads like 10.4 volts, my alternator is definitely bad right?
Could also be a faulty connection between the battery and alternator.
@@PhillipsVisionOne of my positive cable that goes to fuse box was loose and was melting the plastic around it till I thighted. It up would that mean that strand of wires is no longer able to handle the same amount of current thru it & should be replaced, I’m asking due to the fact my Indash aftermarket stereo has an obd2 Bluetooth assory & it reads from 12.6 - 11.3 even seen as low as 10.4 volts also running 2 10” kicker subwoofers!
update so on the TC there are two field wires connecting to back of alternator one is red and other is brown put a meter to red one when cars on and it reads 8.6 volts when I check the brown wire I get nothing.
Mine is running 12 while it’s on with a jump pack if I take it off it dies what does that mean?
Battery is probably damaged and needs to be replaced
Battery is brand new from dealership less than a week old it’s reading 11.5v with headlights, seat warmers an everything on
@@Ivan-qc1kg that’s way too low. If the alternator is working it should be around 14volts under load. Your alternator might be bad or the ground is not good.
@@Ivan-qc1kgdefinitely a alternator a car needs at least 12 volts to start generally your alternator is going out most likely
i just bought a new alternator and still not getting 13.5 volts. could it be a d.o.a. alternator?
@@aaronmillican8500 if the battery is fully charged the alternator will not be charging, so you should have around 12.7volts. If the battery starts dropping below 12.7volts and does not start to recharge, the alternator may be bad. Most automotive parts stores will test it for free.
i jumped a car off and that's when all this happened. the battery and the alternator is brand new, right now with the car off the volts are 12.45, after crank it drops to a constant 12.25 with no accessories on, with lights, ac and window wipers on it drops to 11.6. also the 100 and 40 amp fuses are good, i think i just got a bad alt. out the box.
@@aaronmillican8500 I agree. Take it to be tested and replaced if bad
Mine stays at the 12v range even when running, any suggestions?
It might be going bad. An alternator should be between 13.5 to 14.5 volts
@@PhillipsVision Aw man, just put this one in too, would you also recommend going with one that’s not remanufactured? I’ve heard those suck, and I believe that is what I got, it’s definitely aftermarket
@@austint775 I’ve used remanufactured one before. As long as they are factory done you should be fine.
I’m only getting 8.6 to alt
Only 8.6 going “to” the alternator or 8.6 at the alternator ?
Change it before it dies on you
Here I go to replace mine
I’m afraid I’m next.
@@CC-_-Jerryhave no fear, it's thirty minutes to an hour.
@@CC-_-Jerryit’s not too bad it took me a hour and a half on my truck