Chances are the cable with the white stripe is the positive.
However, it would be best to check with a volt meter. Some auto parts stores will check it for you. If you have one or can borrow one and want to check for yourself, set the meter to DC volts (some autorange, some don't). Turn the charger on. Place the leads across the two cables and if the meter is analog, the needle will deflect, usually to the right and show the voltage. If you have it backwards, the needle will move, usually to the left and bounce several times. If it's backwards don't leave the leads connected too long or you might damage the meter.
If the meter is digital and you have connected it correctly, the meter will show a voltage and may have a plus sign in front of the reading. If you connected it backwards, there will be a minus sign in front of the reading.
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