Motor Polarity

[Freddybnj_2004]

Hey guys... I am going to be sodering a motor later and I don't know which pole is positive or negative?
How can I tell if there are no markings on the motor itself?
It is a Speed 300. Help?!?

 

[FastEddy]

I am holding a Speed 400 in my hand. There are some plastic / nylon rivets on both sided of the contact posts. On mine one of the rivets is red. This will be the positive side.

-Ed

 

[Freddybnj_2004]

Thanks for the info... but it looks like someone was working on this one.. there are just humps where the post use to be and no color... argh!!!

 

[Wardo]

If you can hook power to it, run a quick test on it. It should turn counter clockwise when the power is hooked up correctly.

 

[Freddybnj_2004]

Thanks.. I was flirting with that Idea but wasn't sure if it would instantly fry the motor... so I was hesitant.. Thanks.. I'll try it...