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Old 10-17-2021, 02:29 PM   #1
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Join Date: Apr 2015
Location: Gulf Coast Region Texas
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Warning lamp

I'm trying to trace the wiring for the warning lamp on the dash of my 2003 Holiday Rambler Neptune. It has multiple functions assigned to it and something has it lit. I have a code reader that can read the codes on the cummins diesel but can't detect whatever is causing this warning lamp. Does anyone have holiday rambler documents 16621920, 16621948, or 16621950? Thanks Randy Anders
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Old 10-30-2021, 07:58 PM   #2
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Location: Gulf Coast Region Texas
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Found it! The diagnostic port in the engine bay will give you so much more info than the diagnostic port under the dash. Never saw a failure but the diagnostic port in the engine bay indicated a faling engine oil pressure sender failure. Replaced the sender (O'reilly part number ps406) and the warning lamp was gone when I cranked up the engine.
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Old 10-30-2021, 11:31 PM   #3
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Thanks for posting the fix.

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