03-09 GMC Topkick/Chevy Kodiak Differential Lock Switch GM Part Number: 94667400
2003-2009 GMC Topkick/Chevrolet Kodiak Differential Lock Switch
GM Part # 94667400
Alternate GM Part # 94667399 (number on the item)
Makes a great accessory switch, non-momentary (Replace GM Part# 10388674)
You will also need ACDelco # PT1071 / GM # 15305931 if you want to wire the switch to something other than the stock wire harness. This Connector kit fits into the back of the factory plugs and has six white wires out of it that you can hook it to anything you want. Switches are only rated at 1.5 Amps so use a relay.