My laptop charger connector broke, so I bought a new connector. However, I noticed that the new connector's wires were thinner than that of the existing charger. The laptop charges, but the charger brick is getting very hot. Make note that I did not open up the brick, but rather just soldered the old wire to the existing wire.
EDIT: The charger does not get hot when it is plugged into the outlet and NOT plugged into the laptop, so essentially without a load it doesn't get hot. This is completely normal, but I suppose it suggests there are not shorts in my soldering work.