Vacuum Switch
Remove Green-striped vacuum hose from device box. Connect vacuum pump to device box nipple. Disconnect vacuum switch connector. Apply vacuum and check for continuity between switch terminals No. 1 and No. 4 on Raider and Ram-50. See Fig 1 . On all other models, check for continuity between switch terminals. At 7.7 In. Hg, there should be no continuity. At 11.9 In. Hg, there should be continuity.