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Old 06-20-2014, 10:24 AM   #1
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figallegro's Avatar
Newmar Owners Club
Freightliner Owners Club
Join Date: May 2009
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Solenoid humming

We are getting a humming noise from a solenoid in the forward engine compartment. It seems to be getting louder and quite annoying. There are two solenoids in a box similar to one that Newmar uses for their Bird System where the humming originates, but I don't think we have a BIRD system on our older coach. It is noisey on 12v but is louder on shore power. Is this normal or does this happen if a solenoid begins to fail? The coach is new to us and we didn't notice it until recently. We installed a better converter back in January keeping it plugged in all winter and am wondering if this could have affected it as it has a de-sulfication charge at 14.2 v that runs every few weeks.

Freightliner Chassis, Cummins engine, FMCA #408511
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Old 06-20-2014, 11:15 AM   #2
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Gulf Streamers Club
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Location: Cincinnati
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It hums because it's forgotten the words.

You can use a long handled screwdriver to put on the solenoid and your ear on the handle to isolate which one is humming. Usually it takes alternating current (120 v) to get a good buzz, but a 12 v DC solenoid with dirty or bad contacts I guess could also vibrate.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 06-20-2014, 11:16 AM   #3
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You may have a circuit similar to this.
Have you tried to tap lightly and see if it clears?
Look in this link to see internals of solenoid maybe you can clean them.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans
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