GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide



Pushing or towing your truck to start it may result in unusually high catalytic converter and exhaust system temperatures, which under extreme conditions may ignite the interior floor covering material above the converter.

Whenever a vehicle must be jump started, precautions must be followed in order to prevent the possibility of personal injury. Remember that batteries contain a small amount of explosive hydrogen gas which is a byproduct of battery charging. Sparks should always be avoided when working around batteries, especially when attaching jumper cables. To minimize the possibility of accidental sparks, follow the procedure carefully.

NEVER hook the batteries up in a series circuit or the entire electrical system will go up in smoke, especially the starter!

Trucks equipped with a diesel engine utilize two 12 volt batteries. The batteries are connected in a parallel circuit (positive terminal to positive terminal, negative terminal to negative terminal). Hooking the batteries up in parallel circuit increases battery cranking power without increasing total battery voltage output. Output remains at 12 volts. On the other hand, hooking two 12 volt batteries up in a series circuit (positive terminal to negative terminal, positive terminal to negative terminal) increases total battery output to 24 volts (12 volts plus 12 volts).