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Home > Technical > Urgent help please |
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RRSTDV8 Member Since: 12 Aug 2011 Location: Northamptonshire Posts: 8980 |
I'd guess a battery on its last legs unless you know it's a recent good one. Hopefully the CTEK can get enough in to it to allow an engine start. At the minimum, expect to need a new battery. But rather needs the voltages checking to see if it might be a tired alternator. 2012 SDV6 - it's missing a couple of cylinders
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Wed Sep 06 2023 9:08pm |
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Johnrrs Member Since: 16 Feb 2021 Location: Yorkshire Posts: 457 |
Thanks for your reply. The battery is the original one and the car is 2015 year. Started perfect when I moved the car but now nothing. The CTEC is on 3 lights and I have it on AGM and recondition mode so fingers crossed that I can get it started. Unfortunately it has been on the 3 lights for around 3 hours now. I’ll leave it all night and see what happens. Will the recovery company be able to get it started if the battery is kaput? |
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Wed Sep 06 2023 9:15pm |
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Johnrrs Member Since: 16 Feb 2021 Location: Yorkshire Posts: 457 |
If this is a battery problem will it be the main starter battery that’s at fault or could it be the smaller leisure battery thing that assists with stop start etc? |
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Wed Sep 06 2023 9:37pm |
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Andy K Member Since: 18 Sep 2015 Location: GL Posts: 4946 |
I think AA sell batteries. So that maybe an option |
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Wed Sep 06 2023 9:43pm |
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Johnrrs Member Since: 16 Feb 2021 Location: Yorkshire Posts: 457 |
I’m with green flag so if they can sell me one that would be great. Gunna get up at 6 to see if the car starts then call them if not…….. |
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Wed Sep 06 2023 9:49pm |
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Johnrrs Member Since: 16 Feb 2021 Location: Yorkshire Posts: 457 |
So I got up this morning and the CTEC charger had 4 lights on. According to the instructions when it gets to 4 lights the car should start. Pressed the start button and hey presto she fired up. The ca is now in my garage and on charge. New battery required now me thinks. Any recommendations? Does the new battery need coding to the car? I’m pretty confident I can do this job myself but not the coding bit as I have nothing to code it with. To say I’m relieved is an understatement even though I’m probably going to work today just to pay for the new battery. Thanks for all the replies.👍 |
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Thu Sep 07 2023 6:15am |
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TheWojtek Member Since: 08 May 2015 Location: Poznań, Poland Posts: 737 |
No, you just remove the old, put in the new, program the radio stations again. Regards etc.,
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Thu Sep 07 2023 8:16am |
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Brian Considine Member Since: 26 Mar 2022 Location: SE UK Posts: 93 |
Seven years out of a battery is pretty good going & these cars need a good battery. It owes you nothing so replace it.
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Thu Sep 07 2023 11:06am |
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Disco_Mikey Member Since: 08 Apr 2012 Location: Dundee, Scotland Posts: 4395 |
This is incorrect. The BMS should be reset, as it does affect the smart charge system, and subsequently charge rates etc If you don't reset it, you will likely not notice any issues, but there is a lot that goes on in the background with these cars |
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Thu Sep 07 2023 11:35am |
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Johnrrs Member Since: 16 Feb 2021 Location: Yorkshire Posts: 457 |
I’ve had the CTEC charger plugged in all day now and all the lights or on including the green battery ok light. I thought these chargers go through a sequence and check if the battery is faulty and if so doesn’t pass the 5th light test and goes red. Does this mean my battery is ok? |
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Thu Sep 07 2023 3:28pm |
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TheWojtek Member Since: 08 May 2015 Location: Poznań, Poland Posts: 737 |
I assume this does not have to happen whenever the battery is removed, but the BMS measures the actual capacity of the battery and adjusts voltage and current accordingly? So in case of a vast difference between old and new it will not charge above a predetected limit of the old? Like "it only counts down"? That's a poor management system in my book if it measures the capacity but ignores an increase. It's the "Battery Replacement" procedure in IID and SDD, right?
OK, thanks for this tip, I was oblivious to this and changed a couple of batteries within past 15 years, what exactly could've go wrong? Regards etc., Wojtek --- WAS: 2006 RRS Supercharged IS: 2010 RRS TDV8 HSE |
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Thu Sep 07 2023 3:42pm |
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NoExpert Member Since: 28 Jan 2022 Location: Poznań, Poland Posts: 478 |
The BMS accounts for battery wear over time. Not resetting it will make it think it’s still charging an old dying battery rather than a new one at full capacity. So you get less charge and less battery life.
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Thu Sep 07 2023 4:28pm |
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Johnrrs Member Since: 16 Feb 2021 Location: Yorkshire Posts: 457 |
Ok so been having a play with the car tonight and even though the CTEC charger says all is fine and dandy it obviously isn’t. When I unlock the car and open the door there is a big warning on the dash saying battery low please start engine. The car will actually start and all warning lights go off. I can’t risk going out in it unless it’s to get the battery checked and replaced if required. I may even get a company like AA or Halfords out to replace the battery as the prices seem ok(around £300 fitted)l I’ll keep the forum updated with what I do.👍 |
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Thu Sep 07 2023 7:03pm |
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Andy K Member Since: 18 Sep 2015 Location: GL Posts: 4946 |
It maybe because you connected the charger directly to the battery, rather than the neg lead to chassis.
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Fri Sep 08 2023 7:49am |
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