Chevrolet Silverado 2004 Owner's Manual page 453

V8 Engine 8.1L Engine
11. Connect the other end of the negative (−) cable to
12. Now start the vehicle with the good battery and run
13. Try to start the vehicle that had the dead battery.
V8 Engine, Diesel
Similar
the remote negative (−) terminal, marked GND, on
the vehicle with the dead battery.
the engine for a while.
If it won't start after a few tries, it probably
needs service.
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