Quote:
Originally Posted by trophy956
the resistor is there to lower the voltage to the duty solenoid a which conrtols line presure but not the transfer clutches,higher voltage could cause a early failure of the solenoid
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The resistor when in circuit, has no purpose in respect of line pressure. It provides a separate modified PWM signal, which protects the A solenoid valve against excessive wear.
As a result of the this low voltage signal via the resistor, the valve is prevented from always closing hard against the seat. N.B. The valve moves continuously, at a speed of 50 cycles per second.