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Old 12-17-2016, 06:45 PM   #1
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Trombette solenoid hums all the time

I have a 2013 Tuscany 40EX, I noticed today that even with shore power unplugged, battery disconnect clicked off and engine/generator off the trombetta solenoid in the electrical compartment at the left front of the RV has a humming noise, it never stops.

Has anyone ever seen this?
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Old 12-17-2016, 10:45 PM   #2
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Yes, replace it.
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Old 12-18-2016, 06:57 AM   #3
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And keep your old one as an emergency backup, if you're ever on the raod and replacement fails. Sounds like it is still working but on it's last legs.
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Old 12-18-2016, 07:07 AM   #4
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Enlighten me! Trombetta?
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Old 12-18-2016, 07:11 AM   #5
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Never mind. Brand name.
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Old 12-18-2016, 10:40 AM   #6
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It's an isolator relay
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Old 12-18-2016, 11:01 AM   #7
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The isolator relay connects the house and chassis batteries together so the converter can charge them. And it isolates the batteries when in use and if either has low voltage to protect the other set. They cost about 30 bucks.
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Old 12-18-2016, 11:35 AM   #8
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http://www.ltdrvparts.com/INTELLITEC...7790000110.htm

Looks like about 43 bucks here. This is the one I have. They come in many shapes and sizes.
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Old 12-18-2016, 11:46 AM   #9
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Quote:
Originally Posted by Agaveguy View Post
I have a 2013 Tuscany 40EX, I noticed today that even with shore power unplugged, battery disconnect clicked off and engine/generator off the trombetta solenoid in the electrical compartment at the left front of the RV has a humming noise, it never stops.



Has anyone ever seen this?

With everything off, shouldn't the solenoid also be off? ....to isolate the batteries since no charging is taking place? In that case I would expect the coil to be de-energized and not humming.
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Old 12-18-2016, 12:10 PM   #10
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The relay is going bad, that's how mine went. It gets real hot too...
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Old 12-18-2016, 12:11 PM   #11
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These relays are always energized (as long as the Batts are good) they are either isolating or joining the battery banks.
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Old 12-18-2016, 12:46 PM   #12
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These relays are always energized (as long as the Batts are good) they are either isolating or joining the battery banks.

Trying to understand this..... are you sure the solenoid is always energized? It is a simple electromagnet and plunger with a spring. No power to coil let's spring retract the plunger, and switch contact is broken. Energize the coil, and the plunger overcomes the force of the spring, and makes the switch contacts.

If the converter charger is charging, I would expect the solenoid to be energized, and the two batteries to be tied together.....however with everything off, the solenoid should be off also, breaking the connection between starting and house batteries.

What am I missing here?
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Old 12-18-2016, 01:13 PM   #13
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The relay always has batt voltage for both banks going to it (large posts) it also has switching voltage (small posts) the switching posts and voltage are what cause the relay to isolate or join.
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Old 12-18-2016, 01:14 PM   #14
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It will also join when engine is running to charge from alternator (some not all)
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