Flat Battery Anomaly

ardvark · 12th November 2019, 04:09

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?

SD1too · 12th November 2019, 08:07

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

COLVERT · 12th November 2019, 17:51

So do it NOW.--------

Mike Noc · 13th November 2019, 11:28

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.

MarkS · 14th November 2019, 17:13

Quote:

Originally Posted by Mike Noc

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.

I believe when disconnecting the FBH, one MUST disconnect the multipole control connector BEFORE disconnecting the power connector (or it's associated fuse F8 in the engine fuse box), otherwise the FBH will be permanently damaged.

Likewise when reconnecting, one MUST reconnect the power connector BEFORE the multipole control connector.

I stand corrected if I am wrong.

ardvark · 8th March 2020, 10:45

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.

12th November 2019, 04:09	#1
ardvark Al 75 CDTI Tourer Auto Join Date: Mar 2009 Location: Studley Posts: 1,457 Thanks: 1 Thanked 69 Times in 48 Posts	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? __________________ ARDVARK

12th November 2019, 08:07	#2
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,389 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	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 __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

8th March 2020, 10:45	#6
ardvark Al 75 CDTI Tourer Auto Join Date: Mar 2009 Location: Studley Posts: 1,457 Thanks: 1 Thanked 69 Times in 48 Posts	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. __________________ ARDVARK

12th November 2019, 17:51	#3
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	So do it NOW.--------

13th November 2019, 11:28	#4
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,551 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	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.