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Thread: How's the vacuum switch work?

  1. #1
    Full Access Member bike-maker's Avatar
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    Default How's the vacuum switch work?


    So I want to hook up an idiot light in my dash to my vaccum switch on the fuel filter housing. The truck is originally a gasser, so there is no wiring for it. How does the switch actually function? My assumption is that when it senses a vacuum, the electrical terminal just has continuity to ground. This sound correct? Makes for an easy hook up if that's the case.
    Mike

    1984 F350 Crew Cab 4x4 SRW, originally a Gasser/Auto truck. Now Sportin':
    7.3IDI, ATS 088 Turbo, PSD Intercooler, York On Board Air, ZF-5, Lucky Mod, 4.10 gears, Hydroboost, Air bags in rear, 3" Straight Pipe, 35" Mud Terrains, Carter electric fuel pump run parallel to stock lift pump, Manual Fuel selector valves, Custom gauge cluster, Explorer OHC, Coolant Filter, Group 31 Batteries, 4/0 Battery Cables, 3G alternator, Windstar electric fan conversion, Clutch Linkage Heim Joint Mod, Headlight Relay Mod, Running Light Relay Mod, Manual GP's

    Gearing up for a SAS....

    2002 Cougar 281BHS 31' Fifth Wheel

    2006 Home Made Harley

  2. #2
    1988 F-350 DRW
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    Default

    Bike,

    The fuel filter pressure switch (on the filter housing) is a normally open switch that closes to ground (lighting the fuel filter indicator lamp) as a result of a clogged fuel filter. The fuel filter indicator lamp is supplied with +12V (hot in RUN or START) via 15A fuse 18. (From 1988 model year wiring diagram).

    Regards,
    Jim Jim Jim

    -- 1988 F-350 (type F379) 7.3 NA diesel ZF5 4.10 DRW 11' service body
    -- 1981 Toyota pickup 2.2L diesel 5-speed LB
    -- 1980 Mercedes 300SD 3.0L turbo AT

  3. #3
    Full Access Member bike-maker's Avatar
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    Default

    Just what I was looking for, thanks
    Mike

    1984 F350 Crew Cab 4x4 SRW, originally a Gasser/Auto truck. Now Sportin':
    7.3IDI, ATS 088 Turbo, PSD Intercooler, York On Board Air, ZF-5, Lucky Mod, 4.10 gears, Hydroboost, Air bags in rear, 3" Straight Pipe, 35" Mud Terrains, Carter electric fuel pump run parallel to stock lift pump, Manual Fuel selector valves, Custom gauge cluster, Explorer OHC, Coolant Filter, Group 31 Batteries, 4/0 Battery Cables, 3G alternator, Windstar electric fan conversion, Clutch Linkage Heim Joint Mod, Headlight Relay Mod, Running Light Relay Mod, Manual GP's

    Gearing up for a SAS....

    2002 Cougar 281BHS 31' Fifth Wheel

    2006 Home Made Harley

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