Do you have dcc switches or do they have green wires attached?

Thanks Hunt.  They are both running prefect again now.  It also fixed the light on 1 of them.

I am unable to change the address on either of my bachmann locos.  The last time I used them they were address 1 and address 2.  Today the address 1 Loco is still working fine but the address 2 Loco is now on address 3 and it has its directions revirsed.  I've went through the steps of changing the address on both locos but neither will take a new address.  Any info would great