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Old 09-17-2015, 08:51 PM   #1
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What does this solenoid do?

New-to-me 1994 Allegro Bus, 5.9L with Allision Transmission.

I am trying to learn systems. The MagneTek charger is plugged into 120 volts a/c. Coming off the charger is heavy gauge wire going to one side of solenoid (pictured) and to two circuit breakers. Off the opposite side of solenoid heavy gauge wire goes off somewhere as well as powers other two circuit breakers. I am not sure when this solenoid is activated or why. Any insights?

Also, the only info I can see on the Converter/Charger is MagneTek serial number 20969 and a small "PR 7239". A google search did not reveal much. Is this one of the old school constant voltage chargers? If so, how long is it safe to leave plugged in. I would hate to fry batteries. What voltage is full charge? 12.8? Thanks alot!



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Old 09-17-2015, 09:54 PM   #2
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I am just guessing here as I am as new to the RV thing as you but that looks like the solenoid that connects the battery to the converter. Mine has a switch at the side door that is labeled battery connect/disconnect. Just for giggles have someone activate your switch and listen to see if that's it. You can hear mine close anywhere in the coach if its quite
I am learning all the systems like you and if you can locate the components they are all fairly simple. I have worked on aircraft for 40 years but since there are no diagrams for my coach you have to pull panels and trace things down.
Good luck.
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Old 09-18-2015, 11:06 AM   #3
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No there is no solenoid that connects battery to converter

There are several nearly identical solenoids in an RV (Differences are all internal) They include
Isolator Solenoid (Connects Chassis and House batteries for charging only)
"Boost" or Emergency Start or Aux Start solenoid.. May be same as above, connects battereis together to "Jump Start" when needed (Manual control this solenoid is normally designed for short term operation (30 seconds max)

Disconnect: this connects battery to house, or chassis battery to vehicle

And lastly on some a starter solenoid (powers starter on either main engine or generator) all of these can be physically identical.

HOW TO FIGURE THEM OUT:

Trace the big wires and you will have a clue. Trace the small wires only if you must since they are harder to trace.
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Old 09-19-2015, 11:20 AM   #4
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That switches between your geny and outside power
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Old 09-19-2015, 02:55 PM   #5
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That switches between your geny and outside power
I don't think so. He probably has a transfer switch, but that's doesn't look like it to me. The transfer switch is on the 120v power feeds, not the 12v cabling.
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Old 09-20-2015, 10:11 AM   #6
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The generator/shore power transfer switch is in another compartment...which brings up another question. In the relaxed state (de-energized) it is connected to generator. When I plug into shore power I can hear the clunk of the transfer and a constant slight buzz. I believe the buzz is the electromagnet relay. My concern is, is it safe to leave plugged in for days or weeks? I'm assuming it must be a continuous duty relay but it is concerning at the least.
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Old 09-20-2015, 10:39 AM   #7
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I just changed mine and that's what it looked like but you could be rite
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Old 09-25-2015, 08:51 PM   #8
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Found it. There is a switch near the entry door labeled 12volt. Flipping it off kills all 12 volt appliances...lights, lp detector, refrigerator etc.
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