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Old 07-20-2014, 06:18 AM   #1
Stevelou
 
1984 27' Sovereign
1984 27' Airstream 270
Wandi , Western Australia
Join Date: Oct 2009
Posts: 19
Main power switchover system

We have purchased a 1982 310 Airstream Motorhome with an Onan Marquis 7000 generator. I am trying to find out where the switching unit to change from city power to generator power is. I have found a box in the compartment where the city power reel is but there are no contacts in this box. Should there be? Or would they have been removed because of the new generator?
How does the motorhome distinguish between city and generator power?
Hope someone can help us
Thank you Louise
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Old 07-20-2014, 06:29 AM   #2
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2009 27' FB Flying Cloud
1991 35' Airstream 350
Jay , Oklahoma
Join Date: Oct 2006
Posts: 1,602
If the electrical system has not been modified, an automated transfer switch handles the chore.

When the shore power is available, the switch stays connected the shore power source, even if he generator is started.

If shore power is not available, start the generator and the switch will automatically change to supply the coach with power from the generator.

I have seen the switches be a little finicky, but generally they work well. Sometimes is seems ours will not switch to the generator until I turn some appliance on….


Regards,

JD
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Old 07-20-2014, 03:53 PM   #3
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1982 28' Airstream 280
Port Angeles , Washington
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I just replaced the transfer switch in my 280. This is the new switch.

Click image for larger version

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I couldn't buy just the switch, had to by box and delay timer as a unit. Your power cord, Romax cable from the generator and Romax cable to the coach will all go to the box and connect to the switch. The old delay was a resister about the size of an ice cube but the new one is a solid state printed circuit board at the left side of the box in the picture.

Like JD said change over is automatic and there is a 30 second delay after the generator starts.
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Old 07-20-2014, 05:31 PM   #4
Stevelou
 
1984 27' Sovereign
1984 27' Airstream 270
Wandi , Western Australia
Join Date: Oct 2009
Posts: 19
Thankyou so much
Does anyone know where the box would be located ?? as
I cant find the box!!!!
lou
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Old 07-20-2014, 05:40 PM   #5
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1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
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The box on my now sold '83, 310 was in the road side rear compartment where the power cord reel was. Up in the right hand corner above the reel, as I recall. Very difficult to access on my unit.
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Old 07-21-2014, 05:02 PM   #6
Stevelou
 
1984 27' Sovereign
1984 27' Airstream 270
Wandi , Western Australia
Join Date: Oct 2009
Posts: 19
Thank you unfortunately we brought our airstream from a on seller so we haven't managed to talk to the owner and find out the quirks about it
Louise
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Old 07-21-2014, 08:24 PM   #7
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1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
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Someone may have gutted the original transfer switch box, you mentioned that you found a box in the compartment where the power cord reel is located, and that it had nothing in it.

It is hard to know (or sometimes fathom) what PO's (previous owners) do or did, and why.

Maybe someone with a 310 can photograph what their unit looks like, one with the cord reel and transfer box in that back compartment.
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