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Thread: Gs1100e oil pressure switch

  1. #1
    Join Date
    Mar 2016
    Location
    Chicago
    Posts
    110

    Default Gs1100e oil pressure switch

    FA76E6C8-2D6F-4694-9206-6AF7F8264AEF.jpg

    need clarification...
    metering the switch between the outside lead terminal to the oil-facing disk, there is no continuity at rest. When compressed, it will intermittently show continuity, and when fully compressed, it will show full continuity (1.6 ohm or so)

    Is this faulty behavior? When the switch is installed, engine running or not, there is no continuity between the switch and ground.

    Never had an o/p light since I have had the bike, and I want to install a little LED dash light for o/p.
    when I look at the mechanism, it seems like it should work like this:
    -engine at rest, oil facing disk rests on engine case, grounds switch, o/p light on.
    -engine starts, pressure forces disk up away from the engine case, breaking the ground connection, o/p light goes off.

    if this is the right functionality, then it seems the switch itself should have constant continuity from the outside terminal to the inside disk, regardless of engine state. Which would warrant a replacement. Doesn’t seem rebuildable.

    Can someone confirm/deny?

    thanks Ck
    81 gs1100E
    81 gs550
    74 xlch 1000 custom
    03 ktm 525 exc supermoto
    76 honda cj360
    72 honda cl350
    2 green parrots

  2. #2
    Join Date
    Oct 2007
    Location
    Hampshire. UK
    Posts
    12,795

    Default

    Your understanding is correct and it would seem that your switch is u/s. They're still available new, though with a black plastic nut rather than white, and not expensive.
    79 GS1000S
    79 GS1000S (another one)
    80 GSX750
    80 GS550
    80 CB650 cafe racer
    75 PC50 - the one with OHV and pedals...
    75 TS100 - being ridden (suicidally) by my father

  3. #3
    Join Date
    Mar 2016
    Location
    Chicago
    Posts
    110

    Default

    How’s this for a motherfunker....

    bought a replacement (black) one, and it acts/tests the same.
    only passes continuity when the plunger is fully depressed.

    CE017C10-1A07-47E8-8BA8-173C070BFFE7.jpg
    81 gs1100E
    81 gs550
    74 xlch 1000 custom
    03 ktm 525 exc supermoto
    76 honda cj360
    72 honda cl350
    2 green parrots

  4. #4
    Join Date
    Mar 2016
    Location
    Chicago
    Posts
    110

    Default

    A925B8FF-DBC7-49DB-9025-3EB98BEB9A93.jpg

    Very strange.
    bummer about the photo orientation, eh?
    81 gs1100E
    81 gs550
    74 xlch 1000 custom
    03 ktm 525 exc supermoto
    76 honda cj360
    72 honda cl350
    2 green parrots

  5. #5
    Join Date
    Oct 2007
    Location
    Hampshire. UK
    Posts
    12,795

    Default

    You're testing it wrongly. Pop it in the engine and you should have continuity with the engine cover when it's not running and that should disappear when you start up.
    79 GS1000S
    79 GS1000S (another one)
    80 GSX750
    80 GS550
    80 CB650 cafe racer
    75 PC50 - the one with OHV and pedals...
    75 TS100 - being ridden (suicidally) by my father

  6. #6
    Join Date
    Mar 2016
    Location
    Chicago
    Posts
    110

    Default

    Totally.

    I tried that, and when it didn’t work (no continuity between switch and engine at all, engine running or not), I bench tested it as well, and then decided to share with the forum by snapping a pic.

    by luck, a friend had a 81 gs550 that he gave to me last week and while it’s in full blown “unfinished project” mode, I saw when I put a battery and the key in, that the o/p light worked on his (my) bike. So I’ll probably just harvest that one for my 1100.
    81 gs1100E
    81 gs550
    74 xlch 1000 custom
    03 ktm 525 exc supermoto
    76 honda cj360
    72 honda cl350
    2 green parrots

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