The neutral safety switch is on the center pin of the 3 pin switch on the transmission side, which offers a ground to the starter solenoid in Park and Neutral position. A continuity test is performed by disconnection of the electrical connector and verifying that the switch and the transmission case remain continuous, with continuity only possible when the transmission is in Park or Neutral. If the switch does not pass the test, check the shift linkage adjustment. To replace it, disconnect the electrical connector, unscrew the switch off the transmission and be ready to have a little spillage of transmission fluid. Installation: MAKE sure that the shift lever fingers are aligned in the switch opening, then wrap the threads of the new switch with Teflon tape or cover them with ATV sealant, then carefully screw the new switch into the transmission case. Lastly, pour in the type of automatic transmission fluid recommended into the transmission to reach the desired level.