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05-29-2022, 01:31 PM
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#1
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Senior Member
Join Date: Nov 2019
Location: NW WI
Posts: 413
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Transfer Switch making racket
'03 Winnie Ultimate Freedom
What on earth is all this racket?
I plugged into 110 and adapter to charge my house batteries. Usually it bangs once and I can hear the microwave turn on. It's never made this racket. 1st thoughts, the transfer switch bit the dust. I sure hope not. Could it have something to do with the genset? Inv/charger? Bare wire grounding out? Battery short?
Eventually it will trip a the breaker in the house, sticks and bricks.....
Apparently, I can't upload a vid. It's loud, vibrates the box, quits..... Repeat.....
Hoping someone else had this experienced ....
TIA.......
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05-29-2022, 01:40 PM
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#2
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Senior Member
Join Date: Jul 2018
Posts: 4,875
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Have you used that combination of adapter dogbone, AC outlet, and shore power cord before, without issue? If no, it suggests something is mis-wired; that it will eventually trip the residence circuit breaker is the big red flag.
If yes, what changed?
__________________
2005 Four Winds Majestic 23A
“To the world you may be one person; but to one person you may be the world.” - Dr Suess
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05-29-2022, 01:41 PM
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#3
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Senior Member
Join Date: Oct 2014
Posts: 7,870
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Have you checked the outlet you are plugged into with a voltmeter?
Voltage under the load you are running in the RV?
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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05-29-2022, 02:13 PM
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#4
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Senior Member
Join Date: Nov 2019
Location: NW WI
Posts: 413
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Thanks guys, it's working. I had replaced the garage outlet and it had been giving me some issues after I installed new. it just dawned on me. Old age syndrome. I plugged in a light and it works fine. But I have 2 other outlets that are dead and no tripped breakers. I need to tear apart the new one and see what's going on. Probably tied to the 2 dead ones. I have 1 that's working properly and the coach is fine...... Thankfully.... Appreciate the replies.
__________________
2003 Winnie Ultimate Freedom 40' DP
Cummins 400hp, 1200ft lb torque
Spartan Chassis, 6spd Allison Tranny
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05-29-2022, 04:47 PM
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#5
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Senior Member
Join Date: Nov 2019
Location: NW WI
Posts: 413
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The wife informed me the freezer in the basement is on that circuit too. There's no rhyme or reason how this house is wired. We find all kid of fun circuits. The door panel on the electrical box doesn't mean much...
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05-29-2022, 06:15 PM
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#6
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,655
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All the information you've provided sounds like everything is working as designed.
I do not understand your comment; "Usually it bangs once and I can hear the microwave turn on. It's never made this racket"
How does the RV microwave turn on simply by plugging into your 120VAC house receptacle?
A transfer switch usually begins making noise when the contacts are dirty and/or pitted. This condition occurs when one ignores the transfer switch manual and switches power sources repeatedly when an appliance is running.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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05-29-2022, 08:36 PM
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#7
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Senior Member
Join Date: Nov 2019
Location: NW WI
Posts: 413
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Quote:
Originally Posted by Ray,IN
All the information you've provided sounds like everything is working as designed.
I do not understand your comment; "Usually it bangs once and I can hear the microwave turn on. It's never made this racket"
How does the RV microwave turn on simply by plugging into your 120VAC house receptacle?
A transfer switch usually begins making noise when the contacts are dirty and/or pitted. This condition occurs when one ignores the transfer switch manual and switches power sources repeatedly when an appliance is running.
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I have a bad outlet on the garage that made the transfer switch go a little crazy.
We've had the rig about 3yrs. Everytime I hooked to shore power I heard a bang in the transfer switch when plugging into shore power, then a hum as it runs. Maybe if I switched some breakers off b4 hooking up to shore power it may not bang, idk... When the transfer switch turned on, the microwave would beep and the time would flash. When I heard the beep I knew the coach was getting power.
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05-30-2022, 10:52 AM
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#8
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,655
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If the transfer switch is damaged, the only solution is repair. A humming usually means a less than solid connection at contacts. This can mean burned or pitted contacts, weak springs or loose wiring connections.
BEFORE opening the switch container, turn off all electricity feeding the switch; shore power, genset, and inverter. Then test to affirm there is no electricity to stop your heart.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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05-31-2022, 04:25 AM
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#9
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Senior Member
Join Date: Oct 2016
Location: Rendon, Texas
Posts: 1,455
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Our transfer switch started banging and then would quit, then reseat with no apparent rhyme nor reason. Replaced it and no more banging. Once those contact points get weak or start to get pitted, there is no option but to repair or replace.
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May your smiles be many and the miles be plenty.
Karen & Allen Van Zandt
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05-31-2022, 09:19 AM
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#10
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,945
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Sometimes a little percussive adjustment will cure a problem....ie, whack it.
Ken
__________________
Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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05-31-2022, 02:46 PM
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#11
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Senior Member
Join Date: Nov 2019
Location: NW WI
Posts: 413
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Ok, here is what I'm finding, appreciate the replies. I'm sure the the transfer switch needs some work, but at the current time it's not the main concern.
The reason it was banging off and on was because of a voltage drop when it turned on. I had a switch on the monitor set to No Delay. So the transfer switch kept trying and trying to engage, thus the banging.... All I can think is the chest freezer and who knows what is on the circuit is getting overloaded. That's why the breaker tripped and the switch worked fine on another outlet.
Found out why I lost power to a different garage outlet and the outside entryway outlet. The ground fault in one of the bathrooms was tripped. Why they are on the same circuit is beyond me. I think the electrician was paid in beer.
Here's a couple pix of the monitor and voltage readings. I've seen it drop at times to 105/103 volts..... When I'm plugged into the current outlet there is no drop......
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05-31-2022, 06:13 PM
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#12
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,655
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Quote:
Originally Posted by txcpl
Our transfer switch started banging and then would quit, then reseat with no apparent rhyme nor reason. Replaced it and no more banging. Once those contact points get weak or start to get pitted, there is no option but to repair or replace.
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It's been my experience that with some gentle sanding and smoothing it is possible to revive pitted rough contacts. You're right about the contact springs, once they weaken replacement is the only solution.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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