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Old 09-28-2019, 07:17 PM   #1
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Dometic A/C communications cable bad

2005 Monaco Knight 37PBD - 2 slide outs

Communications cable between front and rear units is bad. Replaced rj11 connectors on both ends, no joy.

Made up a long cable and ran thru the motorhome, both units work indicating the cable between units running thru the ceiling is bad. Confirmed with cable continuity tester.

Now the fun:

I cant figure how they ran the cable between the units. You cant pull it thru with the old, cable doesn't pull mire than a foot or so out. I've taken off ceiling lights, speakers and vent covers. No luck, no cable access. No access to them from behind the thermostat.

There must be a way to access it, maybe some connectors they are run to to connect them under a cover?

If you've figured how or where, please let me know. I don't like the cable hanging from the ceiling and running thru the rv exposed.

Craig
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Old 09-28-2019, 07:36 PM   #2
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Ducted air? Through the ducts. They make a cool little gun that shoots monofilament line, then you pull cable.
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Old 09-28-2019, 07:55 PM   #3
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My guess is they ran bare end wires through holes drilled and then put on ends? Maybe try pulling a wire through that has no end on one side and fish it through? My thoughts are it is getting caught in a joist.
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Old 09-29-2019, 08:22 AM   #4
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Craig, If your Knight has ducted air like my Windsor you should be able
run your new wire through the duct .
Removing air registers will allow you to push a stiff pull wire to registers
past each air cond . Pull the new wire through the duct then snag
the new wire and pull it into the air cond .


Could you have mice ? I had a family of mice move in and they can be

a real challenge to eliminate . I used glue traps but they are smart and soon

learned to avoid them . My mice were mostly running around in the bays
so I finally covered the entire bay floors with glue traps . This finally worked
they couldn't avoid my traps .
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Old 09-29-2019, 10:52 AM   #5
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Dometic A/C communications cable bad

Ive had traps out, no mice, just stink bugs! Also no mice turds or other destruction found.

Ive read the interconnect cable may be more than one cable with a rj11 female to female connecting them. With connector corosion being the culprit. So far no luck in locating one if there is one.

I'll probably use your solution as the ducts are the easiest solution if i cannot find the original cable path. I would think the builders would have away to service/replace the cable, but I might be giving them to much credit.
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Old 09-29-2019, 01:23 PM   #6
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Quote:
Originally Posted by surftalks View Post
I would think the builders would have away to service/replace the cable, but I might be giving them to much credit.
So sad, but so true
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Old 09-29-2019, 07:58 PM   #7
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Had exactly the same problem. Could not find a way to fish wire no matter how.... I decided to run from the front air, under the ceiling panel trim from the front air unit to the wall. There I put it into that white plastic tape down wire conduit to the rear wall. There I again pushed the wire under the wood work, around into the bedroom and was able to push it under trim until I got it to the ceiling trim in the bedroom to an access just in front of the rear air and fished it from there into the air. Works great and can't really see the plastic conduit in the kitchen as ceiling is white too.

I used an interior body panel tool to pry and push the wire.
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Old 09-29-2019, 08:05 PM   #8
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Its been a while since I replaced my air conditioners but I do remember a
female connector , maybe 2 of them but they were not hidden in the ceiling
As I recall they were above a metal plate that was above the air filter and
you are correct those are known trouble makers . IIRC this is the connector
we are referring to . I would find yours and order order some new ones or
maybe Lowes or Home Depot has them .



https://www.amazon.com/Honbay-Female...s%2C483&sr=8-8
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Old 09-30-2019, 01:15 AM   #9
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Quote:
Originally Posted by RamiDav View Post
Its been a while since I replaced my air conditioners but I do remember a
female connector , maybe 2 of them but they were not hidden in the ceiling
As I recall they were above a metal plate that was above the air filter and
you are correct those are known trouble makers . IIRC this is the connector
we are referring to . I would find yours and order order some new ones or
maybe Lowes or Home Depot has them .



https://www.amazon.com/Honbay-Female...s%2C483&sr=8-8
Yes, there were 2 at the air con, only 1 had the cable connected in each. I bought a phone line cable, 50 feet, first just plugged in front to back to test. Solved the problem so I then went through the run mentioned above to install the new connectors.
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Old 09-30-2019, 08:17 AM   #10
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You need to be very careful building new connectors. It is easy to flip one over and make the wrong type of cable.

A strong magniyfying glass is helpful to inspect as well.
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