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Old 08-18-2018, 07:53 AM   #1
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Oil light versus oil dip stick? Cummins 400 ISL

I have checked the oil dip stick and it shows full but, the oil light is randomly coming on. I show pressure on the dash gauge. Does the light respond to oil level, or pressure? If it measures and outputs pressure reading to the gauge (and it does) could there be a second sensor? Or perhaps this one sensor does two things? I.E. on/off and differential pressure?
Afraid to drive with this light on!
thanks for any help
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Old 08-18-2018, 08:53 AM   #2
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I don’t have my wiring schematic handy, but I think there are three senders. The one that controls the dash oil light is the one that also controls the solinoid for the house battery charging while driving.

If your showing oil pressure on your gauge, and your oil leval is with in range, you should be good to go. You’ll get an engine shut down when you loose oil pressure.

Bill
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Old 08-26-2018, 07:03 PM   #3
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There are two oil pressure devices - one sender and one switch. From memory the switch controls the light. Your switch or connection may be faulty.

I have attached a call out picture for the 400ISL. FYI.

Brian
Attached Files
File Type: pdf 400ISL Engine Senders call out.pdf (384.0 KB, 20 views)
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Old 08-26-2018, 10:38 PM   #4
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And at least on the CAPS era ISL370(Now flashed to 400) (Basically early 2004 models and on, have the Variable Geometry Turbo (VGT) ISL and Common Rail). The Pressure is really basically a Yes/No sensor. On Silver Leaf, it does not vary. On the analog gauge, especially at first start up before the engine has warmed up, you will see higher pressure indicated. But one up to temperature, at least as far as Silver Leaf repots, it's a constant...

Could be different in newer ISL's. (And I know what I was trying to say, and not positive I said it well enough to get the info across - sorry!)

Best,
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Old 08-27-2018, 07:00 PM   #5
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l found the problem. Bad ground connection to the oil switch. also prevented the boost coil from engaging while engine was running.
thanks all
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