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Ohms Law Formulas
Electrical formulas for calculating amperage
needs and systems

Watts Divided by Volts = Amperes (amps)   

Watts Divided by Amperes (amps) = Volts

Volts Divided by Amperes (amps) = Ohms

Volts Times Amperes (amps) = Watts
GM TECH TIP-
If the owner of a 2003 Chevy Silverado, Suburban or Tahoe, or GMC Sierra, Yukon or Yukon XL—
all with the 5.3L V8 (VINZ) engine—comes into your shop complaining that the starter continues to
crank after the key is released, don’t look at him as if he were nuts. It turns out that this “ghost”
crank condition is actually just a normal part of the PCM’s operating strategy on this engine, says
GM. The way the General explains it, the PCM on the 5.3 controls the starter relay using the
position of the ignition switch as one of its primary inputs. When the switch is put into and held in
the Start position for .4 second, the computer’s start timer is activated. Once that occurs, the PCM
will command the starter to crank the engine until either it starts or the timer’s limit is exceeded, at
which point the starter will be disengaged. The fuel pump module used on the 5.3 is unique and
can actually accentuate a ghost crank complaint. This pump is set up to be compatible with both
straight gasoline and E85 fuel (a blend of 85 percent ethanol and 15 percent gasoline). Because of
its design characteristics, it may take one to two seconds to build sufficient pressure to start the
engine, especially if the vehicle has been sitting overnight. Due to this lag time, the owner may
release the ignition key prematurely for fear of burning up the starter motor. When the starter
continues to run because the start timer limit hasn’t been exceeded is when the owner most
experiences the ghost crank phenomenon.
GM says there’s nothing you can do to change the operating characteristics of the starter motor on
the 5.3. Just explain to the customer that the motor is functioning as designed and that there are
safeguards built into the system to prevent the starter from burning up due
to extended cranking.
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