Shore power help

[LivLoveLaugh]

We have a 30 foot 2012 CCD International that has two shore power input plugs. one is located midship on the drive side and the other is located in the front.
The problem is that when we hooked up to the input on the side we had no 120 to the trailer. We checked the breakers and fuses, all where good. I switched the connection to the front plug and we now have 120 to the trailer.

Any ideas on where the trouble might be. I do not have a voltage tester with me or schematics.

Also we were at Farmington and had the trailer plugged into the side input with no issues, moved on to the Grand Canyon and nothing.

Thanks

[SteveH]

The front input is for a generator. I do not know how it switches.

[daveswenson]

Most likely the problem is your Power Transfer switch. It's a relay that is attached to the back of the power center and switches your power input from the street side connection to the generator connection. It can get stuck in one position so only one input will work. Best Converter has them. 30 Amp Transfer Switches

The other possibility. Do you have a power management system that protects from bad power sources? I have one that protects only my street side connection.

[switz]

The very cheap power transfer switch Airstream installs uses a solid state device to switch between the two power inlets. Five bucks more would have been an actual contractor that is repairable. We had this cheap device in our 2013 25FB International that was built in June of 2012.

The purpose of the switch is to prevent power coming into the coach from both inlets at the same time. It is to be only the front or the rear at one time. This switch could be near the fuse panel or the front bench.

At least you can get AC power into the coach for now. I recently purchased such a unit for two pole double throw for our Classic and it was expensive as it was made in the USA.

Do a Google search for a single pole double throw power transfer switch. Look for one that uses real contacts.

[LivLoveLaugh]

Thanks for all the replies. I guess I'll wait till I get home before I start tearing into this. That is in less I lose the 120 VAC from the the front input.

[blkmagikca]

FYI an ATS (automatic transfer switch) usually has a time-delay relay that allows the generator to reach its full output before it switches the power into the trailer. When I had a LY motor-home, I had to rebuild the ATS as one of the time-delay relays in the ATS had stopped working. Typically the delay is just in excess of 60 seconds, but could be as much as 120 seconds.

[LivLoveLaugh]

blkmagikca: FYI an ATS (automatic transfer switch) usually has a time-delay relay Typically the delay is just in excess of 60 seconds, but could be as much as 120 seconds.

Thanks for the reply. Moved on to new campground and thought I had more problems. I plugged in to the front shore power input and no 120 VAC to the trailer. Now what...then after about a minute or more we heard a click and the power came on.
BTW still have issues with the side input. I contacted Jackson Center they concur that it is most likely is the transfer switch and emailed me a list of dealers.

[blkmagikca]

FYI, attached is the circuit diagram of the modified ATS in the Land Yacht motor-home which I previously owned. You can see the time delay relays in it. There is also a 60-second delay when you turn on the air conditioner - for the same reason. So, on a hot day it took about 3 minutes until there was any cool air.