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Warning light working erratically on '96 RD


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I have a '96 RD688S with a manual E7 350. The warning light that goes off for low oil pressure, low water level, or high water temperature has started going off for no apparent reason, and it usually only stays on for a few minutes before going back off. I unplugged the low water sensor in the reservoir, to no avail. I replaced the high water Kysor alarmastat on the back of the water manifold. Still going off. I'm guessing the oil pressure sending unit must be going out. My question is, does the light get its electrical feed from the oil pressure gauge itself, or is there an electronic sending unit on the motor somewhere? The gauge is manual and fed by an oil line off the oil filter base.

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Jake

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  • 2 weeks later...
  • Solution

The oil psi sender is behind the speedo/tach in an aluminum block. The #4 line off the filter base runs through the cowl/firewall to this block then to the gauge. BTW, unplugging the coolant level sensor will activate the alarm. When the coolant resivior/tank is full the coolant completes the circuit, by unplugging it you open the circuit causing the kysor module to think the coolant is low. More often that not the coolant level sensor is the problem, scale builds on the coolant probe insulating it.

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  • 2 weeks later...

The oil psi sender is behind the speedo/tach in an aluminum block. The #4 line off the filter base runs through the cowl/firewall to this block then to the gauge. BTW, unplugging the coolant level sensor will activate the alarm. When the coolant resivior/tank is full the coolant completes the circuit, by unplugging it you open the circuit causing the kysor module to think the coolant is low. More often that not the coolant level sensor is the problem, scale builds on the coolant probe insulating it.

Turckster, you were right. The low water sensor in the reservoir fixed it. After you told me that, I unplugged it and jumped it with a wire, and the light went off. Do I replaced it and everything is working like it should now. Thank you very much. MACKS, try unplugging yours and jumping it. I bet it will solve your problems, too.

Jake

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  • 5 years later...
On 3/15/2015 at 6:42 PM, jakebrake86 said:

Turckster, you were right. The low water sensor in the reservoir fixed it. After you told me that, I unplugged it and jumped it with a wire, and the light went off. Do I replaced it and everything is working like it should now. Thank you very much. MACKS, try unplugging yours and jumping it. I bet it will solve your problems, too.

What do you mean by jumping it with wire ? Might have same issue trying see how I can test it 

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