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Old 4th June 2011   #1
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Charging and 12v fridge problems, help please

Hello

I have a coachman genius

This week the 12volt battery charger has stopped working.

The fuse is ok
The charger light comes on
The battery is about 4 months old

Could it be the charger unit gone down? but the light still switches on?

Could the battery have a cell down, the systems work with on 12v

Is the charger all part of the main electric panal or is there a seperate charger unit?

Also the fridge will not work on 12v but this has been like that for a while, is there a inline fuse for the fridge? works spot on on gas or 240v

Thanks for the help

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Old 4th June 2011   #2
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Hi so many questions and so many possible answers.

First what is the battery voltage?
When charger on what is battery voltage?
Some fridges are wired to 12 volt only when connected the the car as no single 12 volt battery will keep a fridge working for very long due to power consumption. The 12 volt systems is generally in place for travel mode only.

To check if battery has a cell down you will need to test with a hydrometer

The wiring of the charger can vary from makes and models.

Others will be along to comment on your system and view my questions which may also help us all.
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Old 4th June 2011   #3
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Hi John
Thanks for post
Battery is on middle 'level' light, it used to go to max lights when charger was switched on but now stays in same 'mid' place but light on charger comes on / off when switched on /off

Will check battery voltage when I get home

Fridge wont come on when switched to 12v when its connected to battery or when charging (when charger was working) or i think when plugged into car

Thanks lots

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Old 5th June 2011   #4
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Ok Battery at mid level on gauge would suggest approx 12.4 volts rough guide could even be lower suggesting battery getting very flat.

However when you turn the charger on the battery indicator needle should rise to around the 13 volt area of the gauge If this is not moving I suggest charger, fuse, or broken wire maybe to battery. A volt meter would prove current flow from out put terminals on the charger or the charger wires at the battery. It is a case of tracing at what point the power flow stops along the wiring or at the charger.
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Old 5th June 2011   #5
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First off the fridge will not work on 12v till the car is plugged in and the engine is running and will take hours to cool as the 12v option is designed to help keep it cool while travelling after it has been used on either gas or 230v first and even then may only just slow the defrost process long enough to get to your destination, Depending on the age of the caravan will depend on how the fridge receives it's power from the car so please indicate to us how old the caravan is then i can advise on how to check the supply from the tow car but in the mean time have a look at the fuse for the supply from the car (should be near the car battery) inline fuse and will be 15 amp for older caravan or 25 amp for a newer caravan....

Now for the charger/battery situation, Firstly check all the fuses starting with the one from the battery charger and as i don't know your caravan this may be an inline fuse or could be a surface mounted one on a panel or even in a bedding locker, Another option is it could have an internal fuse either at the back of the charger or on a circuit board inside the charger cover and your hand book may indicate where this will be. Another option to try is remove the caravan battery and clean the terminals with wire wool then coat with vaseline before refitting and it's always a good idea to replace the battery fuse as a matter of course...

IN your next post can you supply the exact model,year of manufacture and if possible a photo of your charger/control panel and where it is please..








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Old 5th June 2011   #6
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Thank you all for the comments

Its a Coachman Genius 1995, the fuse is ok, looking at the wire diagram there is not a inline fuse?

Only just got back so will check out the voltage asap when the charger is on /off

Looked at the battery and the indicator is green, so i guess the battery on the face of it is ok.

Thanks again
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Old 5th June 2011   #7
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Hi

Its normal to fit a a 15 /20 amp fuse this may be in 1) the battery compartment 2) in side the van under or local to the battery box,3 ) some models have it in the control panel or in a bank of Fuse inside at the front of the van The fuse is often not shown in the wiring diagram on earlier vans

To test the charger is disconnect one leg of the battery , connect up the hook up ans turn the selector switch to caravan battery The 12 volt DC system ire lighting should work direct of the van battery charger

It would be helpfull if the control panel could be ID ie Zig ( may not say zig as they produced dedicated panels for individual manufacture with the brand name ie coachman
Or it could be "plug In Systems " now part of the Bonus group
In ether case the van battery charge could be built into the control panel or surface mounted local to the control panel

Surface mounted charger may have its own 240 volt fuses for the input and 12 volt dc fuses for the out put


Do not a lot of faith in the green battery indicator as to the condition of the battery !!!!!
Use a muti meter to establish the true voltage

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Old 6th June 2011   #8
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Hi All

thanks for the help

Just been playing.

The PMS unit is:

PMS5V

there is a fuse inside the pms and its ok, I have checked all the wiring, and all seems ok, the circuit breakers seems ok as the the charger light comes on / off when the breaker is tested

The unit is riveted together so its hard to get inside but looking through the vents all looks in place etc

the battery reads 12.4 volts but no change when the charger is switched on etc

If the unit is bust any ideas the best place to get one?

They look pretty costly

Thanks lots

Marcus
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Old 6th June 2011   #9
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Hi
the riveted unit could be de riveted and the internal fuse(s) check also look for burnt components

Probably not economical to risk a repair ( see below ) min charge is about £50 If the charger is fitted into the control pane l A free standing surface mounted replacement will dissipate the heater better

One forum member has just fitted a Sargent Unit and is well pleased

Battery charger suppliers

sargentltd. http://www.sargentltd.co.uk/
Sterling muti stage chargers http://www.sterling-power.com/
Zig http://www.zig-electronics.co.uk/about.htm
caravantechnology. http://www.caravantechnology.com
arcsystems. http://www.arcsystems.biz/
gwcaravans. http://www.gwcaravans.co.uk/
Barry at 12 volt Dc http://www.freewebs.com/12voltsdc/
Schaudt http://www.schaudt-gmbh.de/uploads/m...haudt07_GB.pdf
amperordirect. http://amperordirect.co.uk/products/...y_Chargers.asp

Repairs of Chargers
Battery charger /other electronic repairs http://www.leisureelectronicrepairs.co.uk/index.htm
Barry at 12 volt Dc http://www.freewebs.com/12voltsdc/
Gary @ Arc Systems http://www.arcsystems.biz/



For an exact match replacement ( possible repair ) for try
Plug in System repair Engineer
Ex plug in systems by Steve
http://www.expluginsteve.co.uk/index.htm
Ex- engineer for plug in Systems



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Old 6th June 2011   #10
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Disconnect the battery. Measure the voltage at the battery terminals.
Then, are you getting any voltage on the disconnected battery leads when the charger is on?
To charge the battery this voltage (if any) should be greater than that of the battery (in isolation)
I've had similar problems. In my case the charger was putting out a voltage but it was too low to charge the battery. I fitted a new charger unit and every thing is fine now.
Shop around if you need a new charger, but the one I got is pretty good, and is an "upgrade" on what was fitted as standard.
I posted in a couple of threads - have a look
http://www.caravanning4u.co.uk/forum...ad.php?t=21571
http://www.caravanning4u.co.uk/forum...884#post178884
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