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Battery Flat Over Night

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colb
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Joined: Wed Nov 13, 2019 9:45 pm
Location: Newport, South Wales UK

Battery Flat Over Night

Post by colb » Mon Feb 15, 2021 1:55 am

When I had flat battery, mine turned out to be a duff alternator, it was going flat after I used Headlights next day it was flat. Quick test with a volt meter showed it was only charging at 12v so couldn't cope with what was being used when headlights used. New alternator sorted it and I bought a volt meter that can be plugged into the cigarette lighter socket to monitor its output.
https://www.ebay.co.uk/itm/12V-24V-LED- ... Sw5PJbD8E1
I later fitted a permanent digital volt meter in one of the vacant switch positions on the dash of my Z3 and also one on my Z4 both also have usb sockets in them for plugging in accessories power for them spliced into the cig lighter socket wiring.
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Z Shed Cymru member
1999 1.8 Z3
2003 2.5 Z4
1998 Honda Deauville 650
If the forum helped you, why not help the forum back. Thats the Z4 way! :thumbsup:
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ronk
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Joined: Tue Feb 24, 2009 11:50 am
Location: Durham

Battery Flat Over Night

Post by ronk » Wed Mar 10, 2021 9:45 pm

Ive had that scenario on a car some years ago - The alternator went duff and started to pull current.
Put an ammeter in line and check for -ve discharge when it all gone to sleep.
You don't stop playing when you get old - You get old when you stop playing!
So I bought a 35is with all the toys to play with. :thumbsup:

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