Perkins 1104E Systems Operation Testing And Adjusting page 31

SENR9977 31
Systems Operation Section
Supply Voltage – Supply voltage is a constant
voltage that is supplied to a component in order to
provide electrical power for operation. Supply voltage
may be generated by the ECM. Supply voltage may
also be the battery voltage of the vehicle that is
supplied by the vehicle wiring.
"T" Harness – This harness is a test harness that
is designed to permit normal circuit operation and
the measurement of the voltage simultaneously.
Typically, the harness is inserted between the two
ends of a connector.
Throttle Position – The Throttle position is sent
from the accelerator pedal. This signal is interpreted
by the ECM. The throttle position may be used as
part of a power take-off control.
Total Tattletale – The total tattletale is the total
number of changes to all system parameters.