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Old 03-16-2018, 12:45 PM   #1
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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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Old 03-16-2018, 12:54 PM   #2
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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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It appears to be a self-resetting circuit breaker.
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Old 03-16-2018, 02:37 PM   #3
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Yep...appears to be a circuit braker.

Bob
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Old 03-16-2018, 04:05 PM   #4
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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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Old 03-16-2018, 07:44 PM   #5
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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
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Old 03-16-2018, 10:57 PM   #6
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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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Old 03-17-2018, 05:31 AM   #7
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Old 03-17-2018, 12:05 PM   #8
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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.
snip
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!
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Old 03-17-2018, 12:51 PM   #9
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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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Old 03-17-2018, 03:24 PM   #10
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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.
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Old 03-17-2018, 04:44 PM   #11
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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?
Color code changed or p!ug itself was different in oldies.
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Old 03-17-2018, 09:48 PM   #12
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Mollysdad. That blue wire eventually tied into a red wire that went into the Univolt.
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Old 03-17-2018, 10:53 PM   #13
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12 volt battery charge line from the tow vehicle??
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Old 03-18-2018, 07:52 AM   #14
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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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Old 03-18-2018, 06:29 PM   #15
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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...

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Old 03-18-2018, 11:02 PM   #16
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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.
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Old 03-19-2018, 12:43 AM   #17
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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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Old 03-19-2018, 05:59 PM   #18
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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
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Old 03-20-2018, 07:34 PM   #19
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I would go with a manual reset breaker, rather than fuses.
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