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Old 09-10-2019, 06:58 PM   #1
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Converter Gone?

2014 25' Flying Cloud. Parallax Power Supply Series 7300 Model 7355 55 amp.

Returned from a short trip where everything seemed to work well on shore power but noticed that batteries did not recharge. Plugged into home 30amp power and again all seemed OK. When I flipped the battery switch into the Store position, all 12v things went off (radio, lights, etc). Return switch to Use position, all power returns. I suspect that the converter has gone bad but would like to know details on troubleshooting and if it has gone bad, what is the best model to replace it with? I don't think this one has a multi-stage charger, so I think that would be a good upgrade.

Thanks,
Gary
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Old 09-10-2019, 07:22 PM   #2
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If lights go off when plugged in and battery is in "Store" position, that would mean converter isn't working. But in that case, your batteries were carrying the load the whole time...which is possible if it was a short trip without a lot of power use.

Make sure the breaker for the converter is not tripped, and also check the blade fuses in the DC board, particularly the 30 amp one. You can then check the output of the converter using a multimeter on the converter output connections. Should be 13.x volts.

If it's shot, the Progressive Dynamics PD4655 is a popular choice, and is a direct drop-in replacement.
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Old 09-16-2019, 07:23 PM   #3
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Replacement also bad?

Thanks for the help. I checked out everything suggested such as breaker and blade fuses so it seemed like the original converter was bad. Ordered the Progressive Dynamics 4655 as suggested and installed exactly as the instructions called for. Once installed, here's what I get:

When batteries hooked up but no shore power- no 12v lights or appliances
When hooked to shore power, red indicator light on at battery disconnect panel, lights work when battery on, nothing works when switch moved to store or when batteries disconnected. I do register 110 power at the outlets. Inverter works.

Spoke to Vinnie at Vinnie's Airstream in CA, he said new converter must be bad too, so I've returned it and will get new one on Wednesday.

All breakers and blade fuses are good. Batteries will take a full charge when removed from the AS.

I still suspect I'm missing something but I sure don't know what.

Gary
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Old 09-17-2019, 08:18 AM   #4
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Not sure if the 2014 models are like older ones, but here's how my 2006 23' works:

No shore power - Lights work in Use position, no lights on Store, 12 v red light indicator is on in Use, off in Store

Shore power - Lights work regardless of Use/Store position, batteries will charge only when in Use position, 12 v red light indicator is on regardless of Use/Store position. (The red light only indicates the presence of 12 vdc.)

When on shore power, take a reading of the heavy gauge Red and White wires on the power panel. You should be reading at least 13 vdc.


Question: With the batteries hooked up, when you press Use and Store, do you hear the solenoid engage and disengage?
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Old 09-18-2019, 08:42 PM   #5
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Further converter issues

Thanks for your advice and flow chart. The new PD 4655 is installed and seems to work and be charging based on the small green indicator light on the fuse panel that flashes every few seconds. All blade fuses are good. When on shore power, there is power to all the 110v receptacles that are not wired to the inverter.

With no shore power, batteries connected, lights work in Use position and don't work in Store position. Red light on that panel reflects this status.

With shore power, batteries connected, the red light is on in the Use position but off in the Store position. Lights work when in Use, don't work when in Store. I suspect the power is coming from the batteries.

Output at the converter, when on shore power, is 13.x volts.

I do here the solenoid open and shut with the Use-Store toggle switch.

So it seems power is not getting past this switch when in the Store position to allow power from the converter to power the 12v side.

I'm stumped. Phone call to AS tomorrow I guess.

Gary
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Old 09-19-2019, 08:32 AM   #6
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Quote:
Originally Posted by ghanesdvm View Post
With no shore power, batteries connected, lights work in Use position and don't work in Store position. Red light on that panel reflects this status.
Normal operation

Quote:
Originally Posted by ghanesdvm View Post
With shore power, batteries connected, the red light is on in the Use position but off in the Store position. Lights work when in Use, don't work when in Store. I suspect the power is coming from the batteries.
Correct, power to the lights is coming from the batteries. There is no power coming from the converter. When on shore power the red light should be on regardless of the switch position. Since the red light is off when on shore power there is definitely a problem. Unfortunately (or fortunately for me ) I have never encountered this problem. You can hear the solenoid engage and disengage so I don't thing the issue is there. I don't have a schematic of my AS so your best bet is to call Airstream or visit a dealer.

Quote:
Originally Posted by ghanesdvm View Post
Output at the converter, when on shore power, is 13.x volts.
When on shore power and in Use position, is the voltage at the battery the same as the voltage at the converter? It should be higher at the converter than at the batteries, unless the batteries are being charged, then it should be equal.
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Old 09-19-2019, 09:18 AM   #7
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Batteries? How old? Dead from dealer can happen if trailer sat on the lot for months before you bought it.
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Old 09-19-2019, 10:32 AM   #8
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Originally Posted by Foiled Again View Post
Batteries? How old? Dead from dealer can happen if trailer sat on the lot for months before you bought it.

His batteries seem to be OK, they just aren't charging. When on shore power he doesn't have any lights or other 12v in the trailer. Lights work only when in Use position so they're running on battery power. Also, when the AS is on shore power the red light on the Use/Store should be on even in Store position because it indicates the presence of 12v in the trailer. The light is out. So if the converter is putting out 12, it's not getting to the trailer connections.
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Old 09-19-2019, 06:44 PM   #9
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Problem solved. Unexpected finding.

Thanks to the tremendous telephone help of Vinnie's Northbay Airstream Repair I was able to locate and correct the problem responsible for the way my electrical system was behaving. I appreciate all of the help from forum members and I now understand why we were not on the right track.

Vinnie spent considerable time talking me through several troubleshooting steps like checking voltages, confirming wires, etc. He finally concluded it had to do with wiring near the solenoid or the solenoid itself, so he then walked me through gaining access to that area in the 25' FB FC. By lifting the bed I was able to see many of the components but it took removing a wooden panel located inside the curbside front storage area to visualize and access all these components. As soon as I stuck my head inside I could see an 8 gauge white wire laying unconnected just below the solenoid and then saw where it belonged along the bus bar carrying all of the ground wires. As soon as I was able to replace it, everything worked as it should.

The cause: I store the load equalizer bars inside this compartment with one end tucked towards that wooden panel. For some reason, there's no cover or channel covering the bundle of wires, so last trip, as I pulled out the bar, it must have snagged the wire and pulled it out. Simple fix once located. I will make a small wooden cover for these wires soon.

Thanks again to everyone who offered help, and thank to Vinnie's Northbay Airstream Repair for his knowledge, patience, and advice.

Gary
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Old 09-20-2019, 12:21 PM   #10
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Great! Glad your problem is discovered and solved. Having a ground wire connected is always a good thing.

There is something in analysis and investigation of automotive (and other things) problems that has stayed with me for many years. The longer it takes you to find something, the easier it is to fix. The faster you find it, the longer it's going to take to fix and it will be expensive.

Happy Airstreaming.
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