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25th November 2019, 17:14 | #21 | |
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:
Simon
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25th November 2019, 18:21 | #22 |
Posted a thing or two
rover 75 cdti(rhd), MG ZR(lhd), MG TF(lhd), MG TF(rhd), mini mpi (lhd), Renault megane III (awful) Join Date: Mar 2014
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Too high?
I don't understand why it's goi g flat in around 10 days. |
25th November 2019, 20:44 | #23 | |
This is my second home
R75 Saloon. Join Date: Feb 2009
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1/ The battery is a dud. 2/ You have a serious drain down to earth somewhere. You have a good voltage at the battery terminals on tick-over so it is almost certainly not the charging system. |
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25th November 2019, 21:21 | #24 |
Posted a thing or two
rover 75 cdti(rhd), MG ZR(lhd), MG TF(lhd), MG TF(rhd), mini mpi (lhd), Renault megane III (awful) Join Date: Mar 2014
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It's not the battery either. The old one is charged up and is holding its charge fine.
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26th November 2019, 22:12 | #25 |
Posted a thing or two
Rover 75 Saloon Join Date: Dec 2017
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Pletevl, re-read my earlier post about the battery draining back through failed rectifier diodes in the alternator. If you disconnect the alternator wires (admittedly fiddly) and that stops the battery draining, you know where the fault lies!
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26th November 2019, 23:04 | #26 |
Gets stuck in
MG ZT Join Date: Jul 2014
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I had a Rover 800 that did the same thing, but would flatten the battery in under 24 hours. A new alternator solved that, so well worth pulling the plug on it even if only to eliminate it as the cause.
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27th November 2019, 05:16 | #27 |
Posted a thing or two
rover 75 cdti(rhd), MG ZR(lhd), MG TF(lhd), MG TF(rhd), mini mpi (lhd), Renault megane III (awful) Join Date: Mar 2014
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Can a diode leak be tested with a multi meter or does it not show up?
And how fiddly is fiddly? Mines not going flat overnight. It takes just over a week if the cars not used at all to loose about one volt. Pete. |
27th November 2019, 05:34 | #28 |
Gets stuck in
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The plug can be removed with 1 finger and a screwdriver to push the clip down easily enough, getting it back on is the fiddly part. My battery drain was on a petrol 800 Rover and I'm assuming here but Mabey mine was a few diodes at fault and yours is just the 1, hence the quicker drain on mine. Either way Comfortably numbs suggestion is still worth exploring IMO.
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2nd December 2019, 12:53 | #29 |
Posted a thing or two
rover 75 cdti(rhd), MG ZR(lhd), MG TF(lhd), MG TF(rhd), mini mpi (lhd), Renault megane III (awful) Join Date: Mar 2014
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Hi all,
so, the battery has been off the car for just over a week, I charged it up and it hasn't dropped a volt in a week, it's still giving 12.7 volts. So, for me, the battery is fine. Can an alternator give out 14 odd volts and NOT charge the battery ????? Pete. |
2nd December 2019, 13:05 | #30 | |
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