1998 GMC Sonoma Owner's Manual - Page 112

Accessory Power Outlets (If Equipped) If you have accessory power outlets, you can plug in auxiliary electrical equipment. Theaccessory power outlets are located near the center of the vehicle on the lower part of the instrument panel. Just remove the plug from the outlet and follow the proper installation instructions that are included with any electrical equipment you install. NOTICE: When using the accessory power outlets, 25 maximum electrical load must not exceed amps. Always turn off any electrical equipment when not on in use. Leaving electrical equipment for extended periods will drain your battery. These circuits are protected by a fuse and have maximum current levels. 2-48