[wgardner]

Another check is to get a multimeter and check to see if there's voltage across the battery outputs. If not, blown fuse.

Also, you can use the multimeter to check to see if the + and - on your robot are shorted (i.e., check for a short between the two prongs on the connector that the battery plugs into on your robot). Then you can disconnect things until they're not. This is another way to find the short without having to keep plugging in the battery and possibly shorting out more fuses.

Multimeters are pretty cheap at RadioShack and similar places.