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Old 06-20-2014, 10:24 AM   #1
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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.
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Old 06-20-2014, 11:15 AM   #2
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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.
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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.
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