The attached schematic shows the current setup on the left and the proposed setup on right. Currently my car needs to see four 25Ω solenoids..each grounded through a switch in the computer. Is it possible to use just one dummy resistor instead of four as Ive drawn? Its also important to still be able to tell which switch in the computer is active so Ive also included a pull up resistor one one switch as a demonstration...the test area is where a PIC will be connected with a resistor. SoOOOoooO, the PIC needs to be able to tell which of the four switches is closed, while the computer just needs to see a 25 ohm "solenoid" to prevent a check engine light from coming on. Is this possible? THANKS!