Was the pump sitting around for a long time before you cut it open? Because where the brushes would meet the commutator plane looks corroded. That would stop the pump other than a frozen bearing or as you said bad contacts. It doesn't look like water got in there. The wires on the armature were not that way when you pull it apart! LOL 
Last edited by jwgn777; 03-03-2013 at 05:05 PM..
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