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Old 09-09-2018, 06:36 PM   #1
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1987 34.5' Airstream 345
Menomonee Falls , Wisconsin
Join Date: Jul 2010
Posts: 418
No power when not plugged in

hey,
On our maiden voyage, we had another problem.when we got to Madison,we had power to everything. The fridge , fans pump,lights. Came out after dinner, nothing. Coming home, no power to anything coach related. The engine headlights, signals, markers all worked, but no motorhome stuff. Any suggestions? I don't have a clue where to start. My weak area is electrical stuff.
Thanks. DJ
Once home, plugged in, everything works.
Got brand new batteries too.
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Old 09-09-2018, 06:53 PM   #2
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2019 27' Globetrotter
Salem , Oregon
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I am not sure how anyone can help you without more info. I assume this is a new Airstream motorhome?

Your most likely cause if this is a new unit is that you have a switch in the wrong position. Also check all your fuses.

Post again with details.

Dave
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Old 09-09-2018, 07:47 PM   #3
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1982 31' Airstream 310
champaign , Illinois
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If you have a battery disconnect switch like my 310 you may have accidentally turned it off. Mine is in the step well. One sw for coach one for chassis. Because of their location it's easy to accidently switch one off.
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Old 09-09-2018, 07:52 PM   #4
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There are my two switches in the step well.
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Old 09-10-2018, 02:56 AM   #5
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1991 25' Airstream 250
Oxford , Oxfordshire
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Switch or solenoid and grounds are first areas for exploration. Get yourself a test meter and follow the voltage.
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Old 09-10-2018, 07:08 AM   #6
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1987 34.5' Airstream 345
Menomonee Falls , Wisconsin
Join Date: Jul 2010
Posts: 418
Hey,
Well, it's a 1985 325 classic w 5420 miles on it.
It could be the switch. It's in the battery box behind the chassis battery. I'll check that.
When in Madison, I checked all breakers and fuses. All were in working order.
When I bought this unit, while going through it, I found a junction box, drivers side down by the floor ,right by the hot water heater. About 5x5 inches. In masking tape, it said bad relay. I think it's for the water heater, but I never looked any further.
Could it be the inverter.
I'll check the batteries, maybe they weren't charging. It's been plugged in now for 3 weeks. I would think , if the batteries went dead in 180 miles, I got a problem. That's what makes me think it's a switch, or inverter, or something.
Once unplugged, it's running on the batteries being charged by the alternator. There's no way they can go dead in that 80 mile drive. Two batteries should take me about 20 hours to run down. All that was on was the fridge. So it's something else.
Thanks DJ
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Old 09-10-2018, 07:30 AM   #7
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1991 25' Airstream 250
Oxford , Oxfordshire
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That sounds like it might be the heavy duty junction box. Other place to check is 12v distribution board (are you getting power) and blue isolator function in front engine bay. Checks on functionality all set out in your manual.
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Old 09-10-2018, 07:31 AM   #8
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1991 25' Airstream 250
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The fridge may well be powered from the starter battery. You have no 12v power on the coach side
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Old 09-10-2018, 08:47 PM   #9
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1987 34.5' Airstream 345
Menomonee Falls , Wisconsin
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Thanks BS,
I've wondered what that blue thing was . I'll check that. Do they go bad? What makes them go bad.
The coach did have power to inside stuff when we stopped. The fridge was on, the roof fans were going, and all interior lights worked. It was just getting dark, so my wife turned one of the under cabinet lights on. So I know all that stuff worked.
It could be the blue isolator on the drivers side. Can you tell me what I should be looking for , concerning the isolator?. Thanks DJ
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Old 09-10-2018, 08:51 PM   #10
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1987 34.5' Airstream 345
Menomonee Falls , Wisconsin
Join Date: Jul 2010
Posts: 418
Oh,
Once the power went out,the fridge didn't come back on while driving. The only power we had coming home was chassis stuff. Dash, headlights, ignition, blinkers, brake lights and the fuel injection.
DJ
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Old 09-11-2018, 12:21 AM   #11
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Quote:
Originally Posted by davejay View Post
Thanks BS,
I've wondered what that blue thing was . I'll check that. Do they go bad? What makes them go bad.
The coach did have power to inside stuff when we stopped. The fridge was on, the roof fans were going, and all interior lights worked. It was just getting dark, so my wife turned one of the under cabinet lights on. So I know all that stuff worked.
It could be the blue isolator on the drivers side. Can you tell me what I should be looking for , concerning the isolator?. Thanks DJ
I already told you what to look for with the Isolator and to run through the test procedure. Look in your Airstream manual and follow the test procedures for the Isolator. If you don't have it, they are widely available online. I am more than happy to give a few pointers, but you will need to do the legwork here. You've obviously lost power to all interior 12v services, so suggest you get your self a test meter and follow the current from your batteries to the 12v distribution board. If you do not understand this, get yourself a book on RV electrics, like this one https://www.amazon.co.uk/Electrical-.../dp/007042778X
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Old 09-11-2018, 12:56 AM   #12
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1991 25' Airstream 250
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You are more likely to have duff batteries, a duff solenoid or poor ground. I would start at the batteries and work from there. You will need to check if the Surepower isolator can cut your 12 v internals. I can't recall the wiring off the top of my head, but your coach manual should have all the wiring diagrams.
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Old 09-18-2018, 02:33 PM   #13
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1987 34.5' Airstream 345
Auckland , New Zealand
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Large 12v Breaker

On the back off the battery pullout draw on my 345 is the first line off defence against any serious Battery shorts, it is a large round object prob very close to the solinoid that links chasis battery with house batteries. Anyway that round object is a circuite breaker that may have gone on a holiday ?
Rus
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Old 09-18-2018, 02:52 PM   #14
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Originally Posted by Voltair View Post
On the back off the battery pullout draw on my 345 is the first line off defence against any serious Battery shorts, it is a large round object prob very close to the solinoid that links chasis battery with house batteries. Anyway that round object is a circuite breaker that may have gone on a holiday ?
Rus
That's the solenoid. You can bypass it (temporarily) to check if that is the issue or just check the current to see if it is flowing through it. A cheap fix if that is the problem.
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Old 09-19-2018, 12:25 AM   #15
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1987 34.5' Airstream 345
Auckland , New Zealand
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I try not to muddy the waters, although I may come close to it at times.
On 325 & 345 they came out with a Circuit Breaker 80 amps on the back off the slide out battery box..I was not sugesting the above mentioned Main Battery Solenoid.
Rus
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Old 09-19-2018, 02:56 AM   #16
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Yes, they have the solenoid and a 80amp breaker
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Old 09-19-2018, 05:36 AM   #17
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Originally Posted by Boom Sounds View Post
Yes, they have the solenoid and a 80amp breaker


You can also bypass the breaker to see if that is the problem. Just need a 12v probe and meter and youíll track it down
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Old 09-19-2018, 06:00 AM   #18
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1987 34.5' Airstream 345
Menomonee Falls , Wisconsin
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Thanks guys, I'll check those out. Forgot all about them.
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