Inertia switch wiring | The Z Club of Great Britain
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Inertia switch wiring

Discussion in 'S30 (240Z,260Z,280Z) Electrical' started by toopy, Aug 10, 2014.

  1. toopy

    Z Club Member

    Ive been re-doing the wiring for my facet fuel pump
    When it was installed by the garage they wired it in when the ignition was on ACC,
    i found a lone blue wire with a bullet connector going spare by the washer bottle
    that is only live when the ignition is on, ON, so ideal ;)
    Ive also added a relay and a dedicated fuse as the pump was wired direct.

    I bought a 2 wire inertia switch off ebay, which came from a Rover 25, to make the install safer.
    I presumed you would wire it in series with the pump feed, but i remember reading on an
    earlier thread from years back, that they had wired into the negative side of the pump :confused:

    Also where have other people sited it in the engine bay? ideally if it is to go into the negative side
    i would put it close to the pump which is on the inner wing adjacent to the alternator.
    However i have also read the switch should be on the bulk head, to help avoid false triggering
    from pot holes etc!

    Any of you electrical wizards happen to know which way round i should wire my
    particular switch or does it not matter?


    Attached Files:

  2. jonbills

    ZClub Administrator
    Staff Member Committee Member

    Mine is wired on the positive side on the inner wing in the engine bay.
    If I give it a thump, it cuts out, but it's never cut out on a pot hole.
  3. morbias

    morbias New Forum User

    I put mine on the switching side of the relay so it wouldn't have the full current of the fuel pump running through it. I have the switch itself mounted in the cabin on rubber blocks to help prevent unwanted activation. That way it's easy to reset if it does happen!

    (Edit) [​IMG]

    Kill switch in the diagram is basically used as an immobiliser and is hidden out of view.
    Last edited by a moderator: Aug 10, 2014
  4. pmac

    pmac Active Forum User

    FYI. most facet pumps are pushers not suckers and so should be mounted at the rear beside the tank. The same place Nissan used on markets that had electric pumps.
  5. toopy

    Z Club Member

    :thumbs: Thanks for that
  6. toopy

    Z Club Member


    I have one of the cylindrical types, silver top i think, which i understand can be fitted any where
    in the fuel line. Seen plenty mounted in engine bays at shows, as suckers :p
    The smaller, square type solid state pumps are more suited to under body fitment as they
    are designed to be a pusher.
  7. Paul_S

    Z Club Member

    Thanks for the info on this (old) thread :thumbs:

    I haven't found an inertia switch (yet...??) on my car yet so it looks like I might be installing one soon.

    Out of interest, does anyone know if it's an MOT requirement?

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