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What part of the electrical system is causing issues?


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jacobgrose234
New User

Nov 24, 2023, 6:02 PM

Post #1 of 5 (310 views)
What part of the electrical system is causing issues? Sign In

So the other day i was driving on the highway and my battery light came on. Slowly many things started malfunctioning. My radio turned off, lights started popping up on the dash, a check engine light with low voltage issues came on, and eventually my power steering completely shut off and once I pulled off the road I couldn't start my car without a jump. And even after the jump my car was stuck in first gear (I assume due to very low voltage).

Today I read the voltage as 8.8v. I jumped there car but when I disconnected my jumper the car stalled and shut off. I was able to start the car with the jumper pack and rev the engine a bit and all seemed fine, running at ~13.5V. When I restarted the car the battery light came back on and voltage was at 11.5V. The battery connectors seem relatively clean. The belt and pulleys seem to be in good condition. I believe it may be the alternator but I wanted to be sure before buying one from rockauto. My car doesn't run the smoothest so I wasn't sure if there was any concerning sound.

https://youtube.com/shorts/n3BAtezpmwU?feature=share <-- The short video I recorded with sound

2010 Hyundai elantra


(This post was edited by jacobgrose234 on Nov 24, 2023, 6:02 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 24, 2023, 6:22 PM

Post #2 of 5 (302 views)
Re: What part of the electrical system is causing issues? Sign In

The battery light coming on means only one thing. The battery is not being recharged.

Now, although the alternator is the most common cause of this, it is not the only possibility and there are no guarantees a new one will resolve the problem. Start first by testing ALL the fuses using a test light with the key on.

Also, running the battery as low as you have done will often permanently damage the battery. I suggest having the battery recharged and tested before going any further in this project.

Another thing, DO NOT rely on the alternator to recharge a totally dead battery. They are engineered to maintain a battery but not charge one from dead. These new alternators are too sensitive and you can fry a brand new one by overloading it.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Nov 24, 2023, 6:26 PM)


jacobgrose234
New User

Nov 24, 2023, 6:30 PM

Post #3 of 5 (298 views)
Re: What part of the electrical system is causing issues? Sign In

Okay so for what I should do next is first, I should charge the battery with a battery charger(likely I will have to replace it), test all of the fuses. If none of the fuses are the problem would it likely be an alternator issue? So I would have to replace both the alternator and battery?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 24, 2023, 6:36 PM

Post #4 of 5 (291 views)
Re: What part of the electrical system is causing issues? Sign In

Not necessarily. You're testing the battery to find out if it's any good and will hold a charge. You don't have to replace it unless it tests bad. I suspect it will be OK

I'd say it's probably 75% a bad alternator. It can still be a problem with the wiring or ignition switch but it's not real likely.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jacobgrose234
New User

Nov 24, 2023, 6:54 PM

Post #5 of 5 (289 views)
Re: What part of the electrical system is causing issues? Sign In

Thank you,
I ordered a battery charger and in the meantime I will test the fuses, then once the charger gets in I'll charge it and get it to the closest auto shop that can test my battery. Then hopefully I can replace the alternator and battery(if the battery was damaged or is failing)






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