geoffc
Part of things
Posts: 55 
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OK so like a complete idiot I connected a battery to my mini cooper s as it was flat and managed to mix the leads up. Cue sparks and such for a few seconds.
Car will start and run but get odd behaviour from dash warning lights.
Take it from idle and the battery warning light comes on then others such as abs traction control light up but then go out when engine speed returns to idle.
Am going to swap the flat battery for a good un - which is all I wanted to due 😣 but could not open the boot to change it - and see if this helps as it may of not liked being connected the wrong way round and I suppose voltage issues could cause the strange behaviour.
Yes I know I'm a complete idiot
Any thoughts?
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fad
Posted a lot
Posts: 1,781
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Modern mini? Sounds like you've upset something in the ecu. Can't be much help that that I'm afraid though.
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rbs
Part of things
Posts: 64
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What year / model?
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geoffc
Part of things
Posts: 55
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2003 cooper s.
Everything works as it should with ignition on but engine not running.
Engine running things start playing up, shuting down random items ie power steering goes off, Rev counter sticks, abs, traction control light comes on, Windows don't work. Oh yeah battery light comes on as soon as you lift revs above idle and that's when things play up
My thinking at the moment is that the alternator has gone. Engine off everything runs off battery so works as should.
Engine running body control module expects power from alternator so when it doesn't receive it, it shuts things down to manage the electrical load.
If the ecu or bcm had been damaged then things wouldn't work engine off and engine wouldn't run or start.
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That does sound like you've fried the alternator. Should be an easy fix.
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1988 Mercedes w124 superturbo diesel 508hp
1996 Mercedes s124 e300 diesel wagon
1990 BMW E30 V8 M60 powered!
1999 BMW E46 323ci project car
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geoffc
Part of things
Posts: 55
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Lol easy fix hmm I get back to you on that, what with needing buy / make a tool and nigh on complete removal of the front end
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squonk
Part of things
Posts: 855
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Test, don't guess.
Measure the voltage at the battery with the engine running. It should be between 13.8 and 14.8V (at around 1200 rpm). Any lower or higher and the alternator is probably toast.
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2004 Chevrolet Avalanche Z71
2005 Mercedes CLK320 Cabriolet
1996 Mercedes C180 Elegance Auto Saloon
1996 Rover 620Ti (Dead fuel pump)
1992 Toyota HiLux Surf
1987 Range Rover Vogue (Rusty)
1992 Range Rover Vogue SE (More Rusty)
2006 Chrysler Grand Voyager
2008 Corsa 1.4 Design
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Have you fitted a fully charged battery yet? Low voltage even if the alternator is trying to charge can cause all sorts of wierd random electrical issues.
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geoffc
Part of things
Posts: 55
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Haven't had chance to test yet as away all week driving me lorry - daily driver with 500bhp and a v8 lol. Did try a battery off my other mini which was a fully charged as it will get and it starts fine but battery warning light comes on then things start shutting down. Will be home for the weekend and will definitely be checking output before ripping the car apart.
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some cars have a fusable link in the alternator cable....my dad did the same and it blew the link
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91 golf g60, 89 golf 16v , 88 polo breadvan
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Ryannn
Posted a lot
Posts: 2,421
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Aug 13, 2017 22:31:02 GMT
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Mate of mine did it on a Yaris, needed a new ECU.
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geoffc
Part of things
Posts: 55
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Aug 16, 2017 21:01:28 GMT
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Well got around to checking the alternator, on idle it was kicking out 18.5 volts and boiling battery fluid in the battery. God knows what output was at higher revs when the electrical gremlins start showing up. So front end pulled off and alternator extracted. Hopefully get it fixed tomorrow and see what happens.
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geoffc
Part of things
Posts: 55
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Aug 18, 2017 20:26:43 GMT
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Took the alternator to local auto electrics place and yep, anything that could be blown was lol.
Got a ribbing over red and black and the difference lol. £80 got me a repaired and tested unit, a nice saving over the £180 I was been quoted for service exchange unit. Fitted it today getting drowned in torrent of rain and ta da a working car. Everything seems to work as it should thank god.
Seems the alternator took the hit and saved the electrical systems.
Lesson to be learned? Don't mix jump leads up! Lol
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bortaf
Posted a lot
Posts: 4,549
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Aug 19, 2017 23:28:52 GMT
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Took the alternator to local auto electrics place and yep, anything that could be blown was lol. Got a ribbing over red and black and the difference lol. £80 got me a repaired and tested unit, a nice saving over the £180 I was been quoted for service exchange unit. Fitted it today getting drowned in torrent of rain and ta da a working car. Everything seems to work as it should thank god. Seems the alternator took the hit and saved the electrical systems. Lesson to be learned? Don't mix jump leads up! Lol To be fair to you mate we probably all did the same thing years ago, mistakes are good if you learn from them  Glad it got sorted anyway, it's not often OPs come back and tell the end of the storey and i (and others) appreciate the effort to let us know  , changing bits in the rain just make it more epic when you fix the issue, grab a beer and a yorkie and let the missus know how great you are for putting up with the rain down the bum crack and getting on with it  |
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R.I.P photobucket
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, changing bits in the rain just make it more epic when you fix the issue, grab a beer and a yorkie and let the missus know how great you are for putting up with the rain down the bum crack and getting on with it 