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Thread: Electrical problem with old Mini...

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    Default Electrical problem with old Mini...

    Hi everyone and happy new year.

    Just wanted to get some ideas about this one...

    We've got a classic mini cooper which my dad got as an investment and bit of fun a couple of years ago. Ever since we got it we've had problems with the battery discharging while it's not being used (we only take it out about once a month or so) and we put it down to the alarm draining the battery.

    Eventually we got fed up of constantly having to recharge so got a new battery. However, now the thing won't start off it's own power despite being fully charged (either with a mains charger or by bump starting and letting it run). However, it started fine today when I jumped it from my Veccy...

    Anyone got any ideas for me? The battery shows 12v on the meter when tested. Wondering whether the starter motor is faulty and is taking the power of 2 batteries (Mini + Vectra) together to kick it into action.

    When attempting to start the dash and headlights are dimming slightly, but not extingushing completely as I've always seen in the past when starting cars with dead batteries...

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    possibly a knackered regulator diode on the alternator, when they go they drain the battery when the engine isnt running, hence your power drain

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    Or the little Lucas power regulator box, if it's old enough to be running a Dynamo.

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    Regular Member In a states's Avatar
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    Check the earth in the boot...real rust spot on the old mini's.

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    Regular Member Ian S100's Avatar
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    Quote Originally Posted by In a states View Post
    Check the earth in the boot...real rust spot on the old mini's.
    Ditto - check the earthing strap & both connectors + & - they corode & make a bad connections with the battery so clean well & apply Vaseline all over both battery teminals before you reconnect them.

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    what age is it?

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    Quote Originally Posted by Guyver1 View Post
    possibly a knackered regulator diode on the alternator, when they go they drain the battery when the engine isnt running, hence your power drain
    What he said

    A

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    Regular Member rushy's Avatar
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    Engine : Z22SE (2.2 Petrol)

    Year : 2004

    Mileage : 137000

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    LOL, oh the troubles I had with my mini! Trace the + through the boot floor and under the car to the front. The cable snags on loads of things and tends to ware through in several places. Chances are if you replace it along with the earth strap your problems will be solved. If I remember rightly I just sleeved the power line in an old hose pipe until I replaced it a year later.

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    Regular Member IamtheStig's Avatar
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    Sometimes you can tell a bad earth by feeling the choke cable when trying to turn the engine ....if it gets hot then the car is trying to earth through this rather than the main earths....gearbox to chassis is another one to look out for..

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    Ex Vec-C Admin & Founder GARY3306's Avatar
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    Quote Originally Posted by IamtheStig View Post
    Sometimes you can tell a bad earth by feeling the choke cable when trying to turn the engine ....if it gets hot then the car is trying to earth through this rather than the main earths....gearbox to chassis is another one to look out for..
    LOL, if the earth strap on a Land Rover is snapped or in any other way a poor contact, it fries the Transmission brake cable

    all very valid suggestions above but if you're still getting a power drain overnight, try this; get hold of an ammeter and remove the positive lead from the battery (leave earth connected), connect the ammeter between the lead and the battery pos terminal. The ammeter will show any power draw. to see what is causing this, pull one fuse out of the fuse box at a time and see if there is a significant drop. If there isn't, put that fuse back and try the next one. Keep doing that until the ammeter drops suddenly, then whatever circuit that fuse serves is causing the battery to go flat. However if there is no significant power drain shown by the ammeter or there is no current drop on pulling fuses, then you know it isn't a draw on the battery and you need to be looking for earthing faults or faulty components etc. Hope that helps a bit. Good luck with it mate
    [SIGPIC]VX<font color=Red>R</font> with added Courtenay <img src=https://www.vectra-c.com/forum/images/smilies/biggrin.png border=0 alt= title=Big Grin class=inlineimg />

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