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Photo's too bright on slow shutter speed with Canon 7D?

I want to take motion pictures of cars and water and things with slow shutter speed (2 or 3 second shutter speed) but the images are coming out way too bright. I have the camera on full manual mode. I have the ISO backed off to the bare minimum (100) and the apeture is at its narrowest but the pictures are still way too bright. Like almost white. What am I doing wrong?

You aren't doing anything wrong - in bright sunlight it is not possible to use shutter speeds of several seconds even with a stopped down aperture and mininum ISO. With long shutter speeds you'll overexpose then, even if your other variables are set to "least brightness" - you just can't close the aperture or reduce the ISO far enough to retain a proper exposure in this situation.

You will need a neutral density filter to reduce the intensity of the incoming light to gain longer shutter speeds. I'd recommend a ND4 or ND6 for a start.
E.g. with the ND6 you gain six stops. If you currently overexpose by, say, two stops, then you can reduce the aperture by another three stops from f/22 to f/8 (thus getting rid of diffraction) and increase the ISO to 200, then you should get a nice exposure. I just made these values up, it'll depend on the situation.

With the four stops of a ND4 you could e.g. reduce the aperture from f/22 to f/11 and still reduce the overexposure by two more stops.

Edit:
@deep blue2:
Depends. That's a bit manufacturer dependent, and there is also the notation with a dot in between, such as "ND.6".
E.g. the ten stop filter in my bag is actually called a ND10 one, such as this:

http://www.parkcameras.com/15352/B-W-52mm-ND10.html

It's worth pointing out that a ND6 is not necessarily a six stop filter and especially must not be confused with a ND.6 one - that's something one should watch out for when buying it. Thanks for mentioning this. But was that inaccuracy worth a thumb down ?

Edit2: When ND8 and such refer to an eightfold increase in exposure time, then that's also often written as ND8x, not as ND8. As mentioned, the notation is ambiguous, there is no single official nomenclature.

Edit3:
Just as wikipedia is one source that uses one nomenclature, others use others - that's my point, it's ambiguous. You're right that ND10 is more likely meant as ND10x than ND10 stops.
The link that i gave explicitly says that it's a ten stop filter;
"With a light intensity reduction of ten f-stops, "

I own the 72mm version of it myself, and i remember buying it as a "ND10" as well. Perhaps this is a special thing of ten stop filters.
It appears to be a generic photo for all B+W filters, as it wouldn't fit the look of a 10x one either.

Ah ok, it seemed so as you were the only one who had posted when the first thumb down was given

Cheers!