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12th November 2019, 04:09 | #1 |
Al
75 CDTI Tourer Auto Join Date: Mar 2009
Location: Studley
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Flat Battery Anomaly
Yesterday morning when going to work the car unusually had a flat battery. The AA man came out and tested the battery,alternator and the way the system powered down when the car is locked. Everything apart from the flat battery was fine. He charged the battery for about 10 minutes and off he went. I went to work, travel time about 40 minutes and home time the car started as though nothing was wrong. This morning I checked the car it started no problem.
Has any members had the same problem? Any idea what happened?
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ARDVARK |
12th November 2019, 08:07 | #2 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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Your battery's level of charge was too low on a cold November morning. You need to buy or borrow a mains powered smart charger and charge your battery for at least 24 hours, preferably longer, to restore it to fully charged. If you don't, not only will you risk a repeat performance but your battery will ultimately fail permanently causing more inconvenience and expense.
Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
12th November 2019, 17:51 | #3 |
This is my second home
R75 Saloon. Join Date: Feb 2009
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So do it NOW.-------- |
13th November 2019, 11:28 | #4 |
This is my second home
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009
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Do you have a fuel burning heater? If so it may be faulty and coming on when it shouldn't.
If the problem returns try unplugging the FBH and see if things improve. |
14th November 2019, 17:13 | #5 | |
Gets stuck in
Rover 75 Diesel Tourer, called Perseverance Join Date: Nov 2011
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Quote:
Likewise when reconnecting, one MUST reconnect the power connector BEFORE the multipole control connector. I stand corrected if I am wrong. Last edited by MarkS; 14th November 2019 at 17:18.. |
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8th March 2020, 10:45 | #6 |
Al
75 CDTI Tourer Auto Join Date: Mar 2009
Location: Studley
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Guess what happened this morning?
You guessed it. Flat as a NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-NAUGHTY WORD-. This business of the alternator diode playing up. How can I check this? There is no light on the dash saying the battery is not charging.
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ARDVARK |
8th March 2020, 11:18 | #7 | |
I really should get out more.......
Rover 75 Saloon Join Date: Jul 2011
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Quote:
Regards |
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8th March 2020, 11:19 | #8 |
I really should get out more.......
MG ZT-T 260 Join Date: Feb 2016
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Start the car and check the voltage at the battery with a voltmeter, it should be over 13.5volts and when you switch it off drop down to 12.5 ish. If it stays at mid 12s while running its not charging at all and if it does not get to 13.5 or more its only partially charging, anything more than 14.5v and you will fry the battery.
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8th March 2020, 12:37 | #9 |
This is my second home
R75 Saloon. Join Date: Feb 2009
Location: France/or Devon.
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I get the impression that your battery is on its last legs.--How old is it ?
If you start with your battery flat and put it on one of those chargers that light up green to tell you your battery is charged. 1/ If it takes all night before it lights up green then your battery is probably OK. 2/ If it lights up after only an hour or two your battery is on its last gasp and needs changing. Let us know what voltage you are getting at the battery terminals with your engine ticking over. This is an alternator output check. Normally with a charged battery around the 14 volt mark. Can be as low as 13.5 volts or as high as 15 volts. Batteries like to work at around bath water temperature. Much higher than that and you'll start to lose water from the electrolyte.--- More info in the ---really, really useful info section on the main forum page. Look for my posts. Colvert. |
11th March 2020, 09:13 | #10 | ||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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Quote:
I offered you this advice four months ago. Did you follow it? If so, what was the result? Quote:
Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
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