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Thread: Low oil warning

  1. #1
    retro's Avatar
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    Low oil warning

    I went to premix on my 95 750sl. Is there something I can disconnect so I dont keep getting the low oil warning on mfd.


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    Moderator beerdart's Avatar
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    Zip-tie the float in the up position.

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    Quote Originally Posted by beerdart View Post
    Zip-tie the float in the up position.
    Or, if you want a cleaner engine bay, cut the harness from the oil sending unit. Go to the electronics store and get a 33Ohm resistor. Strip the insulation from the wires, and solder the ends of the resistor to the wires in the harness. You can use shrink tubing over everything to make it nice and clean.

    With this in place, your oil indicator on the MFD will always read full.

    KJ

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    Moderator beerdart's Avatar
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    Quote Originally Posted by johnsonmtz View Post
    Or, if you want a cleaner engine bay, cut the harness from the oil sending unit. Go to the electronics store and get a 33Ohm resistor. Strip the insulation from the wires, and solder the ends of the resistor to the wires in the harness. You can use shrink tubing over everything to make it nice and clean.

    With this in place, your oil indicator on the MFD will always read full.

    KJ
    You could also put the resistor inside the e-box..

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    Click avatar for tech links/info, donation request K447's Avatar
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    Or you can install that 33 ohm resistor inside the electrical box.

    Unplug the Blue oil sender wire from the terminal, and connect the resistor between the Black and Blue terminals.

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    retro's Avatar
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    I have a couple of 470 OHM resisters laying around. Will these work for me?

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by retro View Post
    I have a couple of 470 OHM resisters laying around. Will these work for me?
    Nope.

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    Quote Originally Posted by retro View Post
    I have a couple of 470 OHM resisters laying around. Will these work for me?
    No this will not. Industry standards for sending units (fuel, oil, etc) use decreased resistance (float closer to the top) to indicate the level of fullness. The typical range for these senders is 33 Ohm when full and 240 Ohm when empty. Your 470 Ohm resistors would cause it to read empty.

    K447 and Beerdart's suggestion of pulling the blue wire in the E-box and installing the resistor in there is also a good idea. Hmmm, I may have to do that on mine this winter if I get bored.

    KJ

  9. #9
    retro's Avatar
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    Thanks for the advice guys. Hooked up the resister in the ebox and worked great.

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