Hi Tom,
I have used the Cobolt color detector to tell the colors of wire, but it is 
easy to get a false reading.  I used to put black electrical tape on the 
black ground wire, but that always bothered me, so I googled "colored 
electrical tape" and bought some white tape.  I wanted to get red, but the 
only light color I could get was white.  So, now I tape the red wire, the 
lead that could short out.  Now in the world of electricians, white is 
ground, but I'm not going to worry about that!
Bob, [log in to unmask], K8LR
Skype name:  bobtinn
Live Long and Prosper!