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03-16-2018, 12:45 PM
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#1
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Rivet Master
1970 25' Caravanner
Incline Village
, Nevada
Join Date: Jul 2012
Posts: 631
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Umbilical connector wiring mystery
Have a 7 pin connector that we took out during renovation. Hooking everything back up now and have all trailer lights working. Now going to attach breaks and battery wires but can't figure out what that little box is to the left with the white/red/blue wires attached (whatever it is I misplaced it). Can anyone give me advice on what it is and where I can get a replacement if needed? I do believe the red/white wires are coming from the breaks and the blue wire is going to the battery.
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03-16-2018, 12:54 PM
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#2
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,655
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Quote:
Originally Posted by Jeremy9107
Have a 7 pin connector that we took out during renovation. Hooking everything back up now and have all trailer lights working. Now going to attach breaks and battery wires but can't figure out what that little box is to the left with the white/red/blue wires attached (whatever it is I misplaced it). Can anyone give me advice on what it is and where I can get a replacement if needed? I do believe the red/white wires are coming from the breaks and the blue wire is going to the battery.
Attachment 306463
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It appears to be a self-resetting circuit breaker.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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03-16-2018, 02:37 PM
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#3
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 19,977
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Yep...appears to be a circuit braker.
Bob
__________________
"You don't know where you've been until you leave, enjoy life" RLC
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03-16-2018, 04:05 PM
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#4
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3 Rivet Member
2016 28' International
2015 28' International
2013 28' International
Las Vegas
, Nevada
Join Date: Nov 2016
Posts: 234
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That is a 12V self resetting circuit breaker, similar to a fuse except it will reset when the short is corrected. Underneath the wires it may list the Amperage. Not sure where it goes to, blue wires in a TT are usually for brakes, but you need to tone every wire to ensure it has not shorted with the frame or another wire before trusting full power to the system.
Also 7-way standard wiring has changed over the years, so really make sure that you have everything in the right place!
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03-16-2018, 07:44 PM
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#5
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Rivet Master
1986 34' Limited
1975 27' Overlander
1969 21' Globetrotter
Conifer
, Colorado
Join Date: Jun 2009
Posts: 8,278
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Hi Jeremy9107. I had the same question years ago. I have several of the things on my Overlander's exterior light wiring. I prefer a fuse instead of a thermal breaker that resets itself. If there is a short somewhere, I need to find it, and not have a resetting breaker keep energizing the circuit until the fire gets real big.
I wonder if Airstream still uses these things?
David
__________________
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !
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03-16-2018, 10:57 PM
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#6
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Rivet Master
1970 25' Caravanner
Incline Village
, Nevada
Join Date: Jul 2012
Posts: 631
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Appreciate the replies. Any ideas on what amp circuit breaker would be needed?
dbj216. If changing to a fuse instead, can you give me a link to what this would look like (compete amateur here).
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03-17-2018, 05:31 AM
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#7
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4 Rivet Member
1989 29' Excella
1979 31' Sovereign
1999 25' Safari
Youngsville
, North Carolina
Join Date: Sep 2006
Posts: 344
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Last one I worked on was 30 amps in a 78 Soverign
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03-17-2018, 12:05 PM
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#8
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Rivet Master
2012 23' FB International
Woodstock
, Ontario
Join Date: Aug 2014
Posts: 1,423
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Quote:
Originally Posted by dbj216
Hi Jeremy9107. I had the same question years ago. I have several of the things on my Overlander's exterior light wiring. I prefer a fuse instead of a thermal breaker that resets itself. If there is a short somewhere, I need to find it, and not have a resetting breaker keep energizing the circuit until the fire gets real big.
snip
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The breaker keeps tripping on excess amperage so there will never be an excess amperage to cause a fire. Usually breakers get weakened by repeated use so you will be protected. Advantage of the breaker is that it does reset on an intermittent short. You may never know if the fuse is gone in a safety circuit like brake magnets or tail lights until the failure is discovered the hard way!
JCW
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03-17-2018, 12:51 PM
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#9
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Rivet Master
2017 26' Flying Cloud
Tampa
, Florida
Join Date: Feb 2017
Posts: 7,620
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Might there be some creative wiring done?
Or the color code of a 7 way has changed over the years.
I don't understand why a red and blue would be tied together since blue is normally the output of the brake controller, or that white (grd.) and red (battery) would be across a circuit breaker?
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03-17-2018, 03:24 PM
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#10
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:SPACE A" S/O 11 Air19745
2006 34' Classic S/O
Fort Worth
, Texas
Join Date: Feb 2007
Posts: 1,766
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Self resetting circuit breakers keep attempting to reset themselves, but contiue to trip if the fault is not corrected. This cycling can go on as long as there is power available. This can eventually cause a fire if there is any combustible material nearby. I had every wire between the TT battery and the TV batteries burn up going down a mountian due to a low grade short from pinching an umbilical cord. Automatic resetting circiut breakers are dangerous.
guskmg
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03-17-2018, 04:44 PM
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#11
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Rivet Master
Currently Looking...
Mantua
, Ohio
Join Date: Jul 2005
Posts: 7,062
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Quote:
Originally Posted by Mollysdad
Might there be some creative wiring done?
Or the color code of a 7 way has changed over the years.
I don't understand why a red and blue would be tied together since blue is normally the output of the brake controller, or that white (grd.) and red (battery) would be across a circuit breaker?
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Color code changed or p!ug itself was different in oldies.
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03-17-2018, 09:48 PM
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#12
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Rivet Master
1970 25' Caravanner
Incline Village
, Nevada
Join Date: Jul 2012
Posts: 631
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Mollysdad. That blue wire eventually tied into a red wire that went into the Univolt.
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03-17-2018, 10:53 PM
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#13
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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12 volt battery charge line from the tow vehicle??
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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03-18-2018, 07:52 AM
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#14
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3 Rivet Member
Rockton
, Illinois
Join Date: Jul 2017
Posts: 103
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Good stuff!
On the subject of wiring, I have a 1969 Sovereign and the electrical cord between the trailer and tow vehicle has two plugs that need to be replaced. The trailer side plug takes the round pins and the tow side is a 7 pin flat spade Should I replace the trailer side with a spade style or no?
Thanks in advance
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03-18-2018, 06:29 PM
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#15
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Rivet Master
1986 34' Limited
1975 27' Overlander
1969 21' Globetrotter
Conifer
, Colorado
Join Date: Jun 2009
Posts: 8,278
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I do not understand the advantages of a "two plug" umbilical cord. My son's 69 Globetrotter doesn't have two, and our 86 Limited doesn't have two. Both trailers are direct wired to the trailer exterior lights under the trailer. There is an access panel to the wiring harness.
My 75 Overlander does have two plugs, or should I say did. I will remove the plug in front of the trailer and patch over the hole. I will drill a hole through the floor and tie the new umbilical cord to the wire harness. There is room in the spare tire cavity under the front of the trailer. Going from two plugs to one plug reduces loose connections in the plugs by 50%.
Something for you to consider...
David
__________________
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !
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03-18-2018, 11:02 PM
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#16
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Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
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Umbilical connector wiring mystery
Going from a standard 7-position Trailer umbilical to an EZConnector System.
Allegedly the magnetically mated plug and socket does not get corroded, get loose, or collect dirt and debris. Multiple o-rings to seal out moisture when mated or stored as well.
It looks good, and is a lot easier to connect and disconnect. Will see how it goes.
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
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03-19-2018, 12:43 AM
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#17
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Rivet Master
1970 25' Caravanner
Incline Village
, Nevada
Join Date: Jul 2012
Posts: 631
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connected!
rmkrum. yes that blue wire was for the battery charge line.
Thanks for the advice. Found that self resetting circuit breaker and reconnected, although nervously considering discussions here. will consider changing out to fuse if find the right product.
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03-19-2018, 05:59 PM
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#18
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Rivet Master
1986 34' Limited
1975 27' Overlander
1969 21' Globetrotter
Conifer
, Colorado
Join Date: Jun 2009
Posts: 8,278
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Hi again: A auto parts store has a selection of 12v fuse holders, either glass tube or blade type. Vintage Trailer Supply has some too.
You'll find something you like, or keep what you've got.
David
http://www.vintagetrailersupply.com/category-s/440.htm
__________________
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !
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03-20-2018, 07:34 PM
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#19
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,655
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I would go with a manual reset breaker, rather than fuses.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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