Originally Posted by MilkyWitness (Post 3400185)

2019 BRZ, my car has been acting strange.

It sometimes wont start. It is push button, but I will push the button and I will see some lights on the dash turn on and hear some clicks and then it wont start. Then I try again, and it'll be totally dead, no clicks, no lights, nothing. I then open the hood and I will hear a weird buzzing or electrical sound coming from the passenger side of the engine bay. I will remove the negative terminal from the battery, wait a few moments then reconnect it. Then the car starts just fine when I do that.

I went to Oreilys and they battery tested it and said it was fine. I checked myself with a multimeter and after being parked all night it was at 12.8V turned off, I turned it on and it dipped to 10.71v but started.

I will keep my multimeter in my car incase it dies again and test it then and see what happens, but I just don't understand why it randomly dies. It has done it 3-4 times in the past week.

It hasn't been dead when I start after stopping all night, but it has only ever died after having driven it. It has died after driving it for 15 or so minutes, parking, turning it off, going into a store, coming back out and its dead. It has also died after driving nearly a full tank of gas on the interstate, parking at a gas station, filling up, starting, and its dead.

I have sanded and cleaned the terminals but that didn't do anything and it has died since then. They weren't even really dirty, and they were nice and tight too.

Very confused.

So my question is for now is 10.71v still okay to cold start an engine? What else should I do to diagnose this issue? It hasn't died for a couple days so I am wondering if itll happen again, what should I do? Should I use a multimeter on the battery when it dies again and see whats going on if that helps?

Not sure if the alternator is bad, I don't know how to test it but I could watch a youtube on that. Should I do that?

tl;dr car battery tested at 12.8v cold, 10.71v dip when starting, will randomly not turn on when I start it and hear some clicking, then nothing at all. Removing and reconnecting negative battery terminal fixes it and I can start it just fine. This has happened a few times in the past week when trying to start my car. With car running battery is at 14.2v. Stock original battery and car has 38k miles on it.

Originally Posted by BlOody_BoOger (Post 3400190)

Do you have to hit the brake for it to crank on?

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Originally Posted by MilkyWitness (Post 3400191)

I am a manual so no just the clutch

Originally Posted by MilkyWitness (Post 3400191)

I am a manual so no just the clutch

Originally Posted by BlOody_BoOger (Post 3400192)

Ok I think I know what your problem is let me post a video real quick

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Originally Posted by tomm.brz (Post 3400194)

check the clutch switches, there are 2 of them actually near the pedal

Originally Posted by BlOody_BoOger (Post 3400195)

https://youtu.be/QCtTWgY3IGY

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Originally Posted by MilkyWitness (Post 3400202)

Okay I just went into my car and saw that button, pretty hard to get to. When the clutch is fully pushed in, the switch is not fully pressed, I can push it in further if I use my knife to get to it. I'll have to see if I can get something on there to be able to push it fully in, its really really hard to get to on my car for some reason

Originally Posted by MilkyWitness (Post 3400202)

Okay I just went into my car and saw that button, pretty hard to get to. When the clutch is fully pushed in, the switch is not fully pressed, I can push it in further if I use my knife to get to it. I'll have to see if I can get something on there to be able to push it fully in, its really really hard to get to on my car for some reason

Originally Posted by MilkyWitness (Post 3400185)

2019 BRZ, my car has been acting strange.

It sometimes wont start. It is push button, but I will push the button and I will see some lights on the dash turn on and hear some clicks and then it wont start. Then I try again, and it'll be totally dead, no clicks, no lights, nothing. I then open the hood and I will hear a weird buzzing or electrical sound coming from the passenger side of the engine bay. I will remove the negative terminal from the battery, wait a few moments then reconnect it. Then the car starts just fine when I do that.

I went to Oreilys and they battery tested it and said it was fine. I checked myself with a multimeter and after being parked all night it was at 12.8V turned off, I turned it on and it dipped to 10.71v but started.

I will keep my multimeter in my car incase it dies again and test it then and see what happens, but I just don't understand why it randomly dies. It has done it 3-4 times in the past week.

It hasn't been dead when I start after stopping all night, but it has only ever died after having driven it. It has died after driving it for 15 or so minutes, parking, turning it off, going into a store, coming back out and its dead. It has also died after driving nearly a full tank of gas on the interstate, parking at a gas station, filling up, starting, and its dead.

I have sanded and cleaned the terminals but that didn't do anything and it has died since then. They weren't even really dirty, and they were nice and tight too.

Very confused.

So my question is for now is 10.71v still okay to cold start an engine? What else should I do to diagnose this issue? It hasn't died for a couple days so I am wondering if itll happen again, what should I do? Should I use a multimeter on the battery when it dies again and see whats going on if that helps?

Not sure if the alternator is bad, I don't know how to test it but I could watch a youtube on that. Should I do that?

tl;dr car battery tested at 12.8v cold, 10.71v dip when starting, will randomly not turn on when I start it and hear some clicking, then nothing at all. Removing and reconnecting negative battery terminal fixes it and I can start it just fine. This has happened a few times in the past week when trying to start my car. With car running battery is at 14.2v. Stock original battery and car has 38k miles on it.