Parking Lights stay on, Power Locks don't Work

Hi All,
Daughters 96 Blazer 4.3L, 4WD, 100k. Parking and dash lights are stuck on and the power locks stopped working. This happened at the same time. I dont have the car here yet but any ideas on where to begin trouble shooting would be appreciated.
Thanks!

Check the wiring for all aftermarket electrical accessories such as radio, keyless entry, remote starter, trailer hitch etc. OEM wiring and connectors are very substantial and will usually last the life of the vehicle, as long as it's not tampered with.