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06-13-2020, 03:51 PM
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#1
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 44,458
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Lost all 12VDC power
I lost all 12VDC power in the coach! After troubleshooting the problem I found a bad battery cutoff relay. I bypassed it and all is good! 
The original part was a White-Rodgers 120-105751-6. The replacement is a White-Rodgers 120-901. I ordered it from DB Electrical for $26.99 with free shipping.
Wanted to give you this info in case you have the same problem in the future!  
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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06-13-2020, 04:04 PM
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#2
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Member
Join Date: Mar 2019
Posts: 83
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Yep...been there, done that. I now carry a spare house relay and a battery isolator relay. They don’t go bad often, but Murphy makes sure it happens at the worst of times and locations!
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06-13-2020, 09:36 PM
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#3
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Senior Member
Monaco Owners Club
Join Date: Jun 2011
Location: CA
Posts: 3,227
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Quote:
Originally Posted by MSHappyCampers
I lost all 12VDC power in the coach! After troubleshooting the problem I found a bad battery cutoff relay. I bypassed it and all is good!
The original part was a White-Rodgers 120-105751-6. The replacement is a White-Rodgers 120-901. I ordered it from DB Electrical for $26.99 with free shipping.
Wanted to give you this info in case you have the same problem in the future! |
Joe,
Where is your's located? Mine is in the engine compartment.
__________________
Bill & Brigitte
06 Windsor PEQ, Cummins 400 ISL
2014 Honda CRV
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06-13-2020, 09:44 PM
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#4
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Senior Member
Monaco Owners Club Fleetwood Owners Club
Join Date: Sep 2016
Location: Manitoba, Canada
Posts: 838
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Quote:
Originally Posted by MSHappyCampers
I lost all 12VDC power in the coach! After troubleshooting the problem I found a bad battery cutoff relay. I bypassed it and all is good!
The original part was a White-Rodgers 120-105751-6. The replacement is a White-Rodgers 120-901. I ordered it from DB Electrical for $26.99 with free shipping.
Wanted to give you this info in case you have the same problem in the future! |
More spare parts to get. So far my 12 volt issues have been self inflicted by hitting switch in stairwell.
Thanks Joe,
Terry & Pat
__________________
2002 Monaco Windsor 40PKD. Marjorie 2.
2015 Equinox V6 Roadmaster tow setup
1996 Fleetwood Bounder 36S P32, Sold Oct. 2nd, 2020. Yay.
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06-14-2020, 11:36 AM
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#5
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 44,458
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Quote:
Originally Posted by windsorbill
Joe,
Where is your's located? Mine is in the engine compartment.
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It's in the rear compartment right behind the batteries on the passenger side.
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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06-14-2020, 01:34 PM
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#6
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Senior Member
Monaco Owners Club
Join Date: Aug 2017
Location: On the road
Posts: 938
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Quote:
Originally Posted by MSHappyCampers
It's in the rear compartment right behind the batteries on the passenger side.
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I'm guessing Joe's looks like mine?
__________________
Finally Retired-60% Time in Motorhome
2000 Dynasty Regent, 8.3, Banks Turbo, McCabe Racing 5" Diameter Exhaust, 475 HP 1425 Torque 11+MPG towing 05 Pilot 700W solar & E-Bikes
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06-14-2020, 02:35 PM
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#7
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 7,856
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Is this the part you replaced Joe?
WHITE RODGERS 120-901 CONTACTOR
https://www.amazon.com/RODGERS-120-9.../dp/B00DECQXFM
If so, it can be bypassed. When this is closed it does have quite a bit of parasitic draw on the batteries.
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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06-14-2020, 03:41 PM
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#8
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 44,458
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Quote:
Originally Posted by jacwjames
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Yup, that's the one!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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06-14-2020, 05:24 PM
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#9
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 7,856
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OK, this is what is shown on my parts page for the electrical bay.
Thanks
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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06-14-2020, 05:24 PM
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#10
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 7,856
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OK,
That is what shown on the parts page for the rear electrical bay.
Thanks
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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06-14-2020, 05:43 PM
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#11
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 44,458
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Quote:
Originally Posted by jacwjames
OK,
That is what shown on the parts page for the rear electrical bay.
Thanks
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__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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06-18-2020, 01:21 PM
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#12
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Senior Member
Join Date: Mar 2011
Location: SF peninsula
Posts: 199
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I think that there is some confusion here. Most replies seem to point to the relay in the rear 12 volt distribution panel. That relay is only used for two functions: to connect the house and chassis batteries together (boost) when the chassis batteries are insufficient to start the engine, and to connect them together (using the IRD or BIRD) so that the alternator can charge all the batteries.
There is another large relay which is controlled by the so called Salesman Switch which cuts the 12 volt current to most of the coach. That relay is located in the front drivers side in the distribution panel. The large relay at the rear panel cannot shut off the coach DC power. Attached os a photo of the salesman switch relay. It is in the lower left corner of the photo
Disclaimer: my experience is primarily with my coach, an ‘04 HR Imperial, so, your coach may be different
Dick L 
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06-18-2020, 01:43 PM
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#13
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 44,458
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Dick, the small relay on the bottom is the defective one. It seems to be a normally-closed relay that all 12VDC to the house runs through. I just connected the two large red wires together on the bottom post and that gets my power back.
The large round relay above it is the one that jumps the two sets of batteries together when the "Aux Start" switch on the dash is pressed.
These relays are in the rear compartment on the passenger side.
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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06-18-2020, 02:02 PM
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#14
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Senior Member
Join Date: Mar 2011
Location: SF peninsula
Posts: 199
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Quote:
Originally Posted by MSHappyCampers
Dick, the small relay on the bottom is the defective one. It seems to be a normally-closed relay that all 12VDC to the house runs through. I just connected the two large red wires together on the bottom post and that gets my power back.
The large round relay above it is the one that jumps the two sets of batteries together when the "Aux Start" switch on the dash is pressed.
These relays are in the rear compartment on the passenger side.
Attachment 290073
Attachment 290074 |
Guess why they call them “snowflakes”
Dick
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