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Old 12-21-2015, 08:02 PM   #11
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Not sure about a Seneca, but our Greyhawk has its fuse box under the bed and the cooling/exhaust fan kicks on and off intermittently mimicking the sound you are describing.
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Old 12-21-2015, 08:08 PM   #12
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Not sure about a Seneca, but our Greyhawk has its fuse box under the bed and the cooling/exhaust fan kicks on and off intermittently mimicking the sound you are describing.
Now that's a definite possibility ! I will check ......assuming that it is the fan,how do you stop it from screeching ?

as for the inverter.....no, its further up front
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Old 12-21-2015, 08:16 PM   #13
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If it is there, the shrill may be that the bearings are going in the fan assembly
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Old 12-21-2015, 08:59 PM   #14
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I'm betting it's your converter fan. The fan in my converter doesn't put out a very pleasant sound either. Rather annoying to say the least. They're like the small muffin fan found in a desktop computer.
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Old 12-21-2015, 10:45 PM   #15
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Bad fan on an inverter?
My guess, too!

...or mice!

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Old 12-22-2015, 06:18 AM   #16
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The fan is similar to a muffin fan on a desk top computer. Mine is audible when on, usually a thermostat in the convertor controls it to reduce heat when under a load.

Sounds like a possibility. Make sure you are using some dc voltage( under load) when testing as it may not come on under normal conditions.
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Old 12-22-2015, 06:29 AM   #17
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If your converter is there then I would vote for 2 things. First fan as described previously and/or possibly electric noise from a transformer. Mine went the first 6 months with an electronic noise that was ear piercing. The whole converter was replaced and removed the noise.
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Old 12-22-2015, 06:44 AM   #18
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When my water heater is on electric power it occasionally makes a high-pitched whine. I've found turning it off for a few minutes, then back on again, will usually stop the whine.

If your water heater is located under the bed, that could be the problem.
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Old 12-22-2015, 08:19 PM   #19
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Thanks everyone for the ideas/tips.

Im leaving this weekend with the RV for a few weeks and will try to locate/fix the problem

I will report back my findings
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