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Old 05-14-2015, 07:05 AM   #1
Join Date: Apr 2015
Location: Chester Springs PA
Posts: 33
AGS Magnum to Dometic Temp Sensor Wire?

Hi, I am about to wire my Magnum AGS-N into our 2010 Dutch Aire 4320 using a PT-2 to connect to the Dometic AC/HP system temperature sensor. Magnum says read the Dometic 3109226.005 instructions for connection advice. Those instructions show a dip switch for AGS but say nothing about wire connections.

Has anybody here done this wiring connection and can enlighten me?

Has anybody here fished wires from the roof unit, across the ceiling, down an interior wall, to the basement with success?

My fallback plan would be to use the temp sensor that comes with the AGS but that reduces the functionality a little.

I would like any advise about where any of you might have made your wiring connections for any or all of the connections. I'm sure there is a "simpler and more elegant" method vs the Three Stooges method(like their plumbing work).

Thank you.

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Old 05-14-2015, 10:27 AM   #2
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Hello Cliff

I just did that project in the last couple months in my Dutch Star 4320 and it looks like we should have generally the same issues. Do you have the 5 button CCC thermostat?

Where are you mounting the AGS module and are you also installing the BMK?

PM me and I can provide some direct contact information and talk about it over the phone if you like.

Don, Sandee & GSD Zeus. Guardian GSDs Gunny (7/11/15) & Thor (5/5/15)
2006 2015 DSDP 4320 4369, FL Chassis, 2013 CR-V, Blue Ox Avail, SMI AF1.
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Old 05-14-2015, 06:54 PM   #3
Join Date: Apr 2015
Location: Chester Springs PA
Posts: 33
Hi Don,
I do have the "older" style thermostat. I plan to mount the AGS near the inverter which is hanging between the frame rails towards the back of the main basement. I do not plan on installing the BMK since I haven't heard a compelling reason to do so. Maybe I am wrong on that count.

I will try to PM but maybe others would find the info useful?
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Old 05-19-2015, 06:08 PM   #4
Join Date: Apr 2015
Location: Chester Springs PA
Posts: 33
Today I got through to the Newmar tech guys and discovered what maybe everybody here already knows... the electronic control box for the AC/HP units is attached to the bottom of the front most unit and because of the Newmar duct system it is only accessible by removing the entire unit from the roof. This electronic control box is where the Magnum AGS gets it's trigger to start the generator just prior to the AC/HP starting. On many coaches this box would be accessible from the cabin by removing the vent grill and that is how the Dometic tech data shows it and that was why I was confused. So, to hook up the AGS for the best functionality you have to remove the roof unit to attach the 2 wires that hook into the AGS via the PT-2 into the remote port. Another big problem is finding a route for the wires from the roof to the basement. The duct work can get you fore and aft but getting down from there is a challenge that depends on your individual coach and floor-plan. I have decided to just use the temp sensor that comes with the AGS for now rather than tear the coach apart. Maybe later I will tackle the Dometic hook-up. Maybe not.

Maybe you electrical wiz-kids can answer this question... I believe that the voltage measurement at the battery posts and the voltage measurement at the posts on the inverter will be almost identical and that I can therefore simplify my wiring by connecting the two 18 gauge AGS wires, positive and negative, to the inverter posts, right?

As per Sky Boss' advice I have an Onan Y-harness ordered. I also have my PCI equipment sent to get the software update. PCI does have a bulletin showing how to separate the Magnum equipment from the PCI equipment so that the update is not needed but you lose some of the functions that way.
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