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  1. #1
    triplekoin's Avatar
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    Installing Analog Fuel Guage on 92 SL650

    I recently purchased a 92 sl650 & a 94 SL750. The SL650 seems to be a good running machine so far.... The only thing that drives me crazy is it doesn't have a fuel guage. I picked up a analog fuel gauge and LR-52 module from a 93. To install this on my 92, do I just connect the yellow from stator, ground it to brain box, then red\white (2.5v) to the gauge? Granted after install I'll have LR-21, LR-50, and the new LR-52 modules inside my brain box.


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  2. #2
    BlueFishCrisis's Avatar
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    Based on the wiring diagrams, the LR50 and 52 serve the same purpose, with the 52 providing an output r/w for the sender. You should be able to swap out the LR50 with the 52. Does your ski have a sender installed in the tank? Or do you plan on installing one? The sender will need to connect to ground and to the gauge as well........

  3. #3
    triplekoin's Avatar
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    Yes I do have a fuel tank from a 93 installed on my 92 with a sending unit so it would make sence to swap the LR-50 with the LR-52 and hope I don't see a big blue spark followed by a big snapping sound lol

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    BFC hit the nail on the head.

    LR 21 and LR 52 inside the elec box.

    I would use the 1994 SL 650 wiring diagram as a reference.

  5. #5
    triplekoin's Avatar
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    Connected LR52 in place of LR50 and I'm getting 28 volts through the red/white wire???? I don't have the orange wire hooked up because the sensor on the cooling rail was cut by previous owner. Would it make a difference if the orange wire was connected? I have the yellow wire connected from the stator and its grounded through the black box....

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by triplekoin View Post
    Connected LR52 in place of LR50 and I'm getting 28 volts through the red/white wire????

    I don't have the orange wire hooked up because the sensor on the cooling rail was cut by previous owner. Would it make a difference if the orange wire was connected?

    I have the yellow wire connected from the stator and its grounded through the black box....
    I expect the voltage would be 2.5 volts, not 28

    Temp sensor wire is Tan (light Brown) not Orange

    Yellow wire is not grounded. Should have 12 volt battery voltage with engine not running.

    LR modules are all grounded through their Black wires.

  7. #7
    triplekoin's Avatar
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    I'll recheck my conections but I'm pretty sure I have it connected right. I'll see if I get 12v on the yellow.... I'll see what the orange wire puts out (maybe 12volts?) But the red\white should be 2.5v. LR52 is specifically for this 2.5 voltage...

  8. #8
    BlueFishCrisis's Avatar
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    Quote Originally Posted by triplekoin View Post
    I'll recheck my conections but I'm pretty sure I have it connected right. I'll see if I get 12v on the yellow.... I'll see what the orange wire puts out (maybe 12volts?) But the red\white should be 2.5v. LR52 is specifically for this 2.5 voltage...
    Orange wire should output around 12 volts, but only with the engine running..... It should be dead when the engine is stopped. This powers any accessories like bilge pump, trim motor, etc.

  9. #9
    triplekoin's Avatar
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    went through and checked yellow 12v when engine off. orange 12v when engine on. red/white 28v when engine on

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    28 volts? Seriously?

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