1994 GMC Suburban Owner's Manual - Page 208

To Jump Start Your Vehicle: 1. Check the other vehicle. It must have a 12-volt battery with a negative ground system. NOTICE: If the other system isn't a 12-volt system with a negative ground, both vehicles can damage& be ~ - - - ~ ~~ - L If you have a diesel engine vehicle with two batteries (or more), you should know before you begin that, especially in cold weather, you may not be able toget enough power from a single battery in another vehicle to startyour diesel engine. If your vehicle has more than one battery, use the battery that's on the passenger sideof the vehicle - this will reduce electrical resistance. 2. Get the vehicles close enough so the jumper cables can reach, but be sure the vehicle's aren't touching each other. If they are, it could cause a ground connection you don't want. You wouldn't be able to start your vehicle, and the bad grounding could damage the electrical systems. You could be injured if the vehicles roll. Set the parking brake firmly on each vehicle. Put an automatic transmission in "P" (Park) ora manual transmission in "N" (Neutral). If you have a four-wheel-drive vehicle, be sure the transfer case is not in "N" (Neutral). 3. Turn off the ignition on both vehicles. Turn off all lights that aren't needed, and radios. This will avoid sparks and help save both batteries. And it could save your radio! NOTICE: If you leave your radio on, it could be badly damaged. The repairs wouldn't be covered your warranty. by 4. Open the hoods and locate the batteries. Find the positive (+) and negative (-) terminals on each battery. 5-4