2005 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 384

Maintenance When Trailer Towing Your vehicle will need service more often when you're pulling a trailer. See Scheduled Maintenance on page 6-4 for more information. Things that are especially important in trailer operation are automatic transmission fluid (don't overfill), engine oil, axle lubricant, belt, cooling system and brake system. Each of these is covered in this manual, and the Index will help you find them quickly. If you're trailering, it's a good idea to review these sections before you start your trip. Check periodically to see that all hitch nuts and bolts are tight. Trailer Wiring Harness Your vehicle is equipped with one of the following wiring harnesses for towing a trailer or hauling a slide-in camper. For vehicles not equipped with heavy duty trailering, the harness is clipped to the vehicle's frame behind the spare tire mount. The harness requires the installation of a trailer connector, which is available through your dealer. If your trailer is equipped with electric brakes, you can get a jumper harness (electric trailer brake control) with a trailer battery feed fuse from your dealer. If you need to tow a light-duty trailer with a standard four-way round pin connector, you can also get an adapter from your dealer. Basic Trailer Wiring All regular, extended cab and crew cab pickups have an eight-wire trailer towing harness. 4-94