Someone got a jump off me the other day and convinced me that it is ok to us the positive terminal only for my vehicle to power his (the one that is in the engine section not near the battery). A few days later dash warnings for ABS and Steering and Check engine began flashing erratically and then the car died (also the radio goes off). It has happened the last few times I have attempted to drive the car. It makes the car stall. I have checked all the connections, the fuses, wires for exposed parts, and I have disconnected the battery for an hour only to find now it doesn't even crank only all the lights continue to work.
Re: May have fried bmw computer chip, how do I know?
Some BMW's have a chip in the battery cable that can go kaput. I've never had to replace one but I'm told they cost around $800 coconuts. When we see jumper cables in BMW's we tell the owner to never use them. These cars are like little rolling space shuttles. The very least you will probably need is a computer relearn/flash/coding/regeristering. Even when changing battries use a BMW batt white case or black which ever came out, Then get it "registered" or you're car'll be confused. I wouldn't ever recommend aftermarket electronics either unless the installer is trained to install units in BMW's.
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The underhood connections can work by themselves...POS to POS, and NEG to NEG...sometimes dirty/weak connections do not allow the power to transfer fully from the underhood connections...if this is the case then you need to connect directly to the battery in trunk for full power charge...again POS to POS, and NEG to NEG...hope this helps
could be the immobilisor but not a lot of idea here sorry ,the positive terminal is always to the right and its the largest terminal ,well 99% of cars are positive to the right with terminals closest to you even if the battery is mounted with terminals away from you ,Anyway ave a funny feeling that you may need to find a car in the scrapyard and remove the computer with the transponder and the chip from the key .although you may be able to get the computer repaired cheap enough
You can jump to the battery or alternator or starter. All have a hot lead. Usual method is positive clamp to the battery "+" terminal and negative cable to a good ground point. This could be the "-" battery terminal, a place on the frame, or a ground point on the engine.
First check the battery terminals are clean and firmly attached- if terminals are ok the battery may be either discharged or faulty.
Get the engine started by jumping from another battery- then check battery running terminal voltage is approx 14.5 volts with load such as headlights or heater fan on.
If voltage ok and battery still doesn't hold charge, the battery is probably faulty - replacement required.
first, you can remove your battery and have it charge somewhere else if you dont have a home charger or if you have a home charger, you can just hook up the red cable to the positive terminal of the battery and the black cable to the negative terminal.
second, if you have a jumper cable, these cables have a pair of black and red alligator clips, use them to connect another car's battery in parallel to yours.
use a pair in your battery, put the red one in your positive terminal and put the black one in the negative terminal. be careful that the other pair on the other end dose not touch with each other. somebody should be holding them apart.
then o the other end where there is a good battery, start the car , now put the black clip to the negative terminal of the battery and then put the red clip to the positive terminal. there should be a spark as you put the last red clip so be careful.
let it be for about 15-20 mins. you can rev up the running cars from time to time.
then after 2- min, you can start your car.
you will only fry your computer if there is a wrong lead on a wrong terminal so be very careful in choosing which terminal is positive and which is negative.
the positive terminal is marked with a plus sign "+ " the negative terminal is marked with a minus sign " - "