Mondeo Battery Draining

Brian

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Feb 19, 2002, 3:02:42 PM2/19/02

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Can anybody help, my mondeo battery goes flat if left overnight. The
alternator is charging the battery with the engine running, but as soon as i
park the car the battery is flatter than a pancake in the morning. I have
tried disconnecting the battery ternimals overnight and the battery then
stays ok. It is only if i leave them connected it drains, so obviously
something is taking power from the battery. I've checked the boot light and
that goes out ok, so i can only assume a faulty alternator. Anyone else had
this problem.

Cheers
Brian

Tony

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Feb 19, 2002, 3:12:13 PM2/19/02

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Had the same problem a few months ago . I am sure the cells have gone in the
battery that hold the charge .You will have to invest in a new battery get
it checked at the same time
"Brian" <brian...@virgin.net> wrote in message
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AgentXavier

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Feb 19, 2002, 3:18:19 PM2/19/02

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can you disconnect your rear window heater by the electrodes at the back??

If so try that as it caused a problem with an Astra I had

"Brian" <brian...@virgin.net> wrote in message
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Dan

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Feb 19, 2002, 4:30:07 PM2/19/02

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What you really need to do is remove one of the battery connections and put
a multimeter set to amps between it and the battery terminal. Failing
that, a 12V bulb might do. You should get a reading (or a light). Then
remove each fuse in turn until, hopefully, one of them makes the reading
decrease substantially. Then find out what's on that circuit and fix it.

If the current drain isn't associated with a fuse the problem probably lies
in the charging or starting circuitry.

--
http://www.danbuchan.co.uk

Andrew Jewitt

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Feb 19, 2002, 7:19:26 PM2/19/02

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"Brian" <brian...@virgin.net> wrote in message
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Do you have a dealer fit CD autochanger? the interface box used for kenwood
changers is a frequent problem, very difficult to spot if you don't know it
could be a problem, an easy one to check before going through the fuse box
though!

Brian

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Feb 20, 2002, 5:01:42 AM2/20/02

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I'm about to go out and buy a new battery....i'll let you all know how i got
on...

"Brian" <brian...@virgin.net> wrote in message
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AWM

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Feb 20, 2002, 5:54:56 AM2/20/02

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Dead cell in the battery or some load such as the boot light is staying on
if none of those it could be an alternator diode fault allowing back
current,

First do a cranking voltage test to check for a dead cell if that shows
nothing try disconnecting the alternator overnight -- if it starts in the
morning you could have a diode fault which you can pin point by conncting
an ammeter in series with the alternator.

For more info see http://www.davrian.freeserve.co.uk/altern.htm

Surprisingly most modern alternator can still charge the battery with one
didode passing current in reverse.

"Brian" <brian...@virgin.net> wrote in message
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AWM

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Feb 20, 2002, 5:57:13 AM2/20/02

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STOP NEVER buy a battery or alternator until you test the alternator and
battery with a voltmeter

"Brian" <brian...@virgin.net> wrote in message

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Brian

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Feb 22, 2002, 4:39:45 PM2/22/02

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Well i bought a new battery and everything is once agin fine. The moral of
this is not to start suspecting complicated faults when it could be
something very simple. Thanks to everyone who replied to my original plea
for help. It was much appreciated.

Cheers
Brian

"AWM" <am...@btinternet.com> wrote in message
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