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Please help diagnose

This unit is under the bed in my U320. When I plug into shore power this unit hammers itself. I watch the readout board in the coach and it just comes and goes until this stops chattering. Nobody seems to know its purpose..well at least me and the electrical supply house. I just had the transfer switch replaced thinking that would do it...no luck..
2001 U320 42 tag with two slides
Build number 1583
Love this forum for all of it's help and members

Re: Please help diagnose

Reply #1 –
That appears to be the cover for your built in surge protector. Now remember that is just a WAG

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Please help diagnose

Reply #2 –
I would think that this is an under/over voltage protection device.  If you plug the coach into a good stable source with everything turned off it may stop the chattering.  If not it's faulty.  You can disconnect it and replace it with a new power protection device.  Here is a link to a company that makes the one I have which is a built in unit.

Keith

Rv Surge Protection | United States | Progressive Industries, Inc.
Keith, Joyce & Smokey the Australian Cattle Dog
1995 U320 SE Extreme 40' WTBI Build # 4780, with a Honda CR-V hopefully still following behind.
Motorcade # 17030
FMCA # F422159

Re: Please help diagnose

Reply #3 –
It is a line monitor.

Where can I find a Power Stop Corp. Analog Line Monitor ALM-50HW?
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Please help diagnose

Reply #4 –
It sure appears to be something that may have to be eliminated..not sure yet. I will put my surge protector and the shore power supply plug and see it that keeps this one from chattering. I'm not sure if this puts the power up on the monitor in the coach...I gotta have that to see what's going on...
2001 U320 42 tag with two slides
Build number 1583
Love this forum for all of it's help and members

Re: Please help diagnose

Reply #5 –
Quote from: Keith and Joyce –
I would think that this is an under/over voltage protection device.  If you plug the coach into a good stable source with everything turned off it may stop the chattering.  If not it's faulty.  You can disconnect it and replace it with a new power protection device.  Here is a link to a company that makes the one I have which is a built in unit.

Keith

Rv Surge Protection | United States | Progressive Industries, Inc.

Keith I have one of those...and I will go home and put it on the stand. And your right..I had the thermostat on for heat pump..did not know it. So that could have been some of it..
2001 U320 42 tag with two slides
Build number 1583
Love this forum for all of it's help and members

Re: Please help diagnose

Reply #6 –
Quote from: Mike Minegar –
This unit is under the bed in my U320. When I plug into shore power this unit hammers itself. I watch the readout board in the coach and it just comes and goes until this stops chattering. Nobody seems to know its purpose..well at least me and the electrical supply house. I just had the transfer switch replaced thinking that would do it...no luck..

This is an Analog Line Monitor, which (though lord I can't find any documentation on the thing) I have the impression is the old-school version of an under/over voltage protection device... without seeing the inside I might suspect there are a couple of capacitors and probably a small transformer in the box to help iron out dirty shore power.  Just a (somewhat) educated guess... and I'm not sure in the least whether it can be just pulled entirely out of the system or replaced by a different device buuuut here's an eBay link to a new one: power stop corp alm-50hw analog line monitor | eBay

Good luck!
Technical Support Manager and official poker of electronics at Laurel Technologies / Bay Marine Supply. Distribution and expert support of Victron Energy, Sterling Power, Blue Sea, Bussman, and Battle Born products.

Re: Please help diagnose

Reply #7 –
I bought it...Thank you.
2001 U320 42 tag with two slides
Build number 1583
Love this forum for all of it's help and members