Jump to content
SAU Community

Battery Drops To 6v On Start...

predator

By predator,
in General Maintenance

 Share

Recommended Posts

predator Grand Master

predator

Posted
Posted

does this mean the battery is dead?

only thing that has been a bit confused is it jumps back to 12v when its sitting idle (not started)

when it's running via a push start, i get about 12v across the alt, and 12v at the battery.. so I'm thinking the alternator is still ok?

I'd check the Current but I blew the fuse on my multimeter a while back :D

Link to comment
https://www.sau.com.au/forums/topic/156766-battery-drops-to-6v-on-start/
Share on other sites
MANWHORE Grand Master

MANWHORE

Posted
Posted

That means that your battery is 'old' or quite small or both.

Iff you go to your local battery world, they have a load tester. If you get them to run the tester on it, they can show you the voltage drop for different loads.

If you're havivng problems e.g. hard to start on cold mornings, then replace it.

If you're not having any problems, then elave it until you do

don't use your multimetre to do stuff like that

cowie165 Veteran

cowie165

Posted
Posted

Hey Gordon. I agree with Deuce Bigalow. When my battery was on the way out, it'd read 12V static, then drop to 8V on start.

With a jump start, it'd sit nicely on 14V.

As an aside, I recently had issues with the battery that I thought was caused by the alternator - it turns out the battery terminals were corroded and preventing the from alternator charging the battery.

When I took my battery to have it checked, the report was that it was still good just flat. It sounds like yours may just be dead.

infamous_t Veteran

infamous_t

Posted
Posted

You battery is sulfated & f*cked... you've got just enough juice to start, then your car is running off the good graces of your alternator, which maybe putting stress on the alternator.

Don't bother load testing as what you have already done is a heavier load test than one they will have.

predator Grand Master

predator

Posted
  • Author
Posted

Well its 'around 12v' when it's started.. it was probably 14v off the alternator, can't exactly remember. I put new terminals on it a few months back, so the terminals should be in good nick.

I actually took it to battery world a couple of months ago (which is where I got it from).. their response was "it's not the battery, it must be something else". I think they were just trying to dodge their you-beut 3 year warranty :)

I think because it just has an alarm and a few things, if I leave it for a week or so it goes dead, and it was just a cheapy Century one for around $100. Only 12 months old :P

Thanks for your help guys.. Think.. none of this cheap ass stuff this time. Think it's time to lash out $300 for a proper Optima or the like. It doesn't get driven that often so needs something that is up to the task.

If there still is troubles I'll investigate a few other things.

Jordan Rising Star

Jordan

Posted
Posted

I read elsewhere in a different thread that bad starting can be due to a bad earth somewhere. Essentially there is not enough amps to get it started :)

On a side note, Another guy at work said hard starting could be something with dirty injectors and/or sucky spark plugs, taking ages to start flowing/sparking properly, but I'm going for the amp things and say battery or earth.

cowie165 Veteran

cowie165

Posted
Posted
W

I actually took it to battery world a couple of months ago (which is where I got it from).. their response was "it's not the battery, it must be something else". I think they were just trying to dodge their you-beut 3 year warranty :(

The same thing happened to me, as I mentioned above. As has been discussed, it could be terminals/earth/alternator. It'd be worth taking it to an auto elec and spend $60 on an hour of testing rather than throw $300 at a car with a bad earth?

Even a cheap battery (eg. mine is a supercharge gold) should last a few years. Yours should still be good dude.

MANWHORE Grand Master

MANWHORE

Posted
Posted

If you take it to battery world, they'll tell you if it's the earth or terminals or whatever. Of course, different stores are of different degrees of help, but they do install batteries, and terminals, so they know if it's a dirty terminal or if it's the battery.

The first thing they'll do is probably clean the terminal before they do the load test.

The good thing about them, is they have the tester, and they don't charge you labour!

Battery world sell this really good battery called amaron. It is a silver calcium battery. For those that know about batteries, you'll know that silver calcium is very high quality. Lots of starting charge, good life, etc. They're maintenance free too. They're cheap as. About $80 for a big one (forgot the size).

I use one of those in my daily. I dont' use one in my r33, because I have a sealed one for the boot.

I wouldn't pay an autoelect $60 when you can get a new b82rz for $80.

Just get b82rz world to check it. If it's terminals, they'll just replace them. having terminals replaced costs $10!

If it's the battery, then get a new one.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • V35_Paul
      Rv37 400r questions

      By V35_Paul · Posted

      A locally delivered Infiniti have remote start installed but don't come with the remote start key. You need a new remote start key and they just need it programed. And this is different to making/programing a new key that just starts the car.  
    • Lithium
      Shoota's R33 GT-R RB30/26

      By Lithium · Posted

      Cheers, and cheers for sharing so much of the build and also sharing the glimpse of what turns out to bring a lot of us poor decision makers together haha.  I do recommend learning more about how to manage it, if not considering getting a  formal diagnosis.  The discussion with the psychiatrist I got my diagnosis through was quite eye opening, things I'd not even considered to be ADHD related and hadn't mentioned were things she asked about out of the blue and were common themes with people with my flavour of ADHD.   It's not a label for people who are hyperactive and ill-attentive, there's more to it than that and some of it can be much more challenging or damaging - though there are of course two sides to the thing, and a lot of the stuff we have to go through and work on to live with it make us effectively "better" at other things as well. Aside from the fact that there is some argument I could have a bit of ASD seasoning in there (came up during the diagnosis, and neurodiverse things seem to not stay as a cookie cut) I suspect you need to learn more about ADHD if you are puzzled about how hyperfocus could possibly apply.  I *do* personally use "superpower" with quotes deliberately, but it's 100% an ADHD thing due to the exact reason that lack of focus is also an ADHD thing... Loosely speaking the inattentive side of ADHD isn't the inability to focus, it's the inability to control where the focus goes.  Not being able to sleep because brain is more interested in thinking about a stupid thing I said to a girl I liked 30 years ago, not being able to focus on work because my brain is more keen on putting together the torque management strategy we're going to try out with a drag car next weekend, not being able to focus on a conversation with someone I WANT to listen to and respect because there is a flickering light in my peripheral vision.    If I could just stop work and build the torque management setup right there and then I'd not hear anything else until it was done.  
    • Shoota_77
      Shoota's R33 GT-R RB30/26

      By Shoota_77 · Posted

      Maybe you should do some more reading.  Google positive effects of ADHD and you'll get your answers.  One of my personal downsides of ADHD has been talking before I think.   Maybe you have it too?
    • GTSBoy
      Shoota's R33 GT-R RB30/26

      By GTSBoy · Posted

      Excuse me for butting in....but which part of ADHD can be considered a superpower? I would have though it far more likely that some ASD comorbidity is more likely to be contributing to an ability to hyperfocus on something. ADHD being aimed somewhat in the other direction. My shed looks like your shed. My whiteboard list of unfinished projects has entries going back 15 years. I know what you're talking about - I just struggle to connect ADHD to the results being discussed.
    • Shoota_77
      Shoota's R33 GT-R RB30/26

      By Shoota_77 · Posted

      Thanks for reaching out!  It's a blessing and a curse at the same time.  I'm undiagnosed but it doesn't take a rocket scientist to see it in me... I have more half started projects laying around my house, shed, garden, etc taking up space and money, destroying aesthetics than if I added up all of my mates projects together. But, ADHD gives me the ability to hyper focus on things that no mere mortal could even  comprehend.  A recent pool build is an example of that....  I dont know anyone else that would be dumb enough and focused enough to take on then complete something of that magnitude. I call ADHD a superpower but it can equally be completely destructive if not controlled and focusedon the right places. Addiction is a major concern to ADHD people and thankfully my addictions have been no worse than projects, XBOX, chocolate and being an arsehole! It's often hereditary and my 13 year old son is currently learning how to drive it at the moment. Keep lurking! If i can finally finish this bloody thing at some point it will be a win for all of us ADHD'ers! 🤪
×
×
  • Create New...