location of 20amp in line 12 v fuse

Immediately following the instalation of a new zig unit which is working ok, there is no power from the battery to the 12v system..Battery is fully charged.

Auto sleeper brochure indicates a probably 20amp fuse failure but cannot locate this fuse anywhere. Can anyone advise the location?

Help would be appreciated

gala

Try under the drivers seat, next to the leisure battery.

Frank

Hello Frank,

Thanks for our prompt reply.

Under the drivers seat there are 3 relays and only one fuse which is the inline Zig unit fusewhose withdrawal only cuts out the zig charger .

Could the the inline battery fuse be anywhere else.?

Regards,

.gala

On my Symphony, there is another fusebox on the bulkhead near the engine battery. I have no idea what they protect though.

Frank

Hello Frank ,

Thanks again. I have noticed a bundle of fuses under the bonnet and above the vehicle battery and will have closer look ----but not tonight !

I will let you know how I get on.

Hello again Frank,

There is a 20amp fuse at the bulkhead among 4 others.
Although the 20amp fuse seemed ok I swapped it for a new one, but the problem remains.
Any other suggestions would be welcomed.

gala
.

All I can suggest is that you get the multimeter out and go hunting. Do you have a wiring diagram?

Frank

Hello Frank,
thaks for your conyinuing interest.I do have a wiring diagramand tests show taht although the battery is fully charged there is no power on the circuit.
When installing the zig unit I wired the new unit to the autosleeper charger on/off switch .which is in the floor cupboard under the oven and am wondering if I this could have rewired wrongly.

Any ideas on the correct wiring of this switch ?.

gala

Hi,
I would have thought that the charger on off switch controlled the mains input and the Zig needs to pick up 12 volts, hope you haven't plugged it into the mains,
Chris

Hello chrisvesey,

You exoressed my own thoughts ! I cannot find a diagram showing the wiring of that switch.

It was not the standard switch thatI had anticipared.and I was interupted during the wiring so it certainly possible that the wiring is wrong.

If you can point me towards a solution I would be obliged.

gala .

According to my wiring diagram (drawing A2SAD11196)
240v comes from a 5amp circuit breaker on the consumer unit to a "Autosleeper connection 6 amp terminal block 240AC" (two wires, pos & neg) and from there to the battery charger, no mention of the switch which we both know is there. I suspect that the switch is where the above connector should be.
If the switch is in place of "Autosleeper connection 6 amp terminal block 240AC", then the Zig unit does not connect to this switch.
BTW Is it a double pole switch? I've never opened mine

A red 65/0.3 wire runs from the leisure battery positive terminal, though a 20 amp fuse to connection No 1+ on the battery charger.
A black 65/.03 wire runs from the leisure battery negative terminal to connection 3- on the battery charger.(no fuse)

A red 65/0.3 wire runs from connector 2+ on the battery charger to connector 8 (12v positive) on the Zig unit
A black 65/0.3 wire runs from connector 4- on the battery charger to connector 9 (12v negative) on the Zig unit
A red 14/0.3 wire runs from connector 5 on the battery charger to connector 1 (Charger mains indicator light) on the Zig unit.

The way I see it, you need to check for 12 pos at connections 1+ and 2+ on the battery charger and at connector 8 on the Zig unit and see where it is going missing.
You also need to check that the neg connectors have continuity to earth - it might be as well to do this first.
Make sure the EHU is not connected while doing this.

HTH
Frank

Frank,

Thanks for your latest post.

I will let you know how I get on,

I will not be able to follow up your suggestions for a few days.

gala

Hi Gala,

Having followed this discussion, and noted Franks very detailed and sound advice, I can only add that I had a similar problem following a recent Alternator change on our 1995 Symphony. All 12V electrics to the habitation area were dead, and after looking at the AS wiring diagram I also located the 20A fuse under the drivers seat, next to the three relays. However, in my case, the fuse was blown (though how the garage managed to do this whilst changing the Alternator is a mystery!) Anyway, replacement of the fuse cured the problem.
On ours there are two more fuses fixed in the wiring loom above the vehicle battery. I know one is the feed to the fridge for 12V operation on the move, but I'm not sure what the other is?
I think Frank's suggestion regarding the earth return is a good one, but it also occured to me that the 12V is held off by one of the underseat relays, which is energised directly from the Alternator when the engine is running. I wonder if this is mechanically jammed or wrongly wired?
Just a thought.

Jeff

Jeff and Di Giblin wrote:On ours there are two more fuses fixed in the wiring loom above the vehicle battery. I know one is the feed to the fridge for 12V operation on the move, but I'm not sure what the other is?
Jeff

The other is for the split charge to charge your leisure battery from the alternator.

Hello Frank,chrisvesey, Jeff and Di Giblin, and Paulmold--phew!,

The Zig charger and wiring have been checked out and are ok. The problem now appears to be only the invan 12v system.
The 20amp fuse in the battery box is fine so what on earth could the fault be?.
Thanks for your interest and I look forward to any further suggestions.

gala.

Good Morning all who showed interest in my problem,

Sorry about the delay in getting back to you, but the problem has been finally been tracked down. I called in a motor home electrical expert who found that the problem is at the Zig mc 4000m control panel. where the connection controlling the battery 12v operation at the panel is dead. A new panel is required just to allow operation of the battery system.

Zig advise that this unit is no longer available and there is no direct replacement !

Any ideaswoiuld be most welcome

It's maybe a daft idea but how would transferring the duff connection to a separate switch work?

gala

gala wrote:Immediately following the instalation of a new zig unit which is working ok,

I thought you'd just fitted, or had fitted,a new Zig unit?
Is this new unit faulty? if so, you're entitled to a refund and it might be worth trying to claim back the cost of the guy you got to look at it.
What was wrong with the old one?

Frank

Frank,

The new unit I fitted was the zig x 70 battery charger which was definately faultyand is now ok. The new problem lies with the Zig mc 4ooom control panel located just above the rear doors and which shows fresh water level, state of leisure battery and off/on switches for the battery 12v system and the water pump.

gala

gala wrote: The new problem lies with the Zig mc 4ooom control panel located just above the rear doors and which shows fresh water level, state of leisure battery and off/on switches for the battery 12v system and the water pump.

gala

Sorry,I was under the impression that this was the unit you replaced with a new one. Have you checked the fuse holder? the rivets holding them have a habit of coming loose and causing problems.

Frank

Hello Frank,

Your continuing interest in my expanding problem is really appreciated.

The electrician who checked the system out was quite clear that the 12v battery was supplying power to the zig unit but a fault in the unit meant that no power was available to the 12v equipment----hence the need for a new unit. Zig advise that this type of unit is now obselete.

However, I will do as you suggest and check that the fuse holder is properly secured as this could cause the fault found by the engineer

As far as I know, the panel over the rear door is just a switch panel and fusebox with a simple BCI and (inaccurate) water level gauge. I don't think there is anything "technical" about it and any problems with it should be mechanical in nature - loose, broken or dirty contacts, terminals or switches.
Does your BCI light up when you press the button?

Frank

Frank,
Have just finished checking the fuse holders and they seem quite firm.

The live connection to the zig control is known as is the dead connection from the unit.

Is it conceivable to consider bypassing the zig control unit, joining these connections through a fused on /off switch

gala

Frank
Sorry I missed your post re the zig unit and the water gauge.. I have had the unit out, and there is an electrical circuit bosrd which the electrician said was the cause of the current problem

gala.

Sorry to be late in on this post but those Zig Panel were / are a pain, the brass rivets broke and any I have sorted have been repaired with a small brass nut and bolt. Apart from the panel vans of that era many of the monocoques were fitted with the same unit

Hello roli,

Your comments have prompted me to have yet another look at the fuse panel (Originally suggested by Frank) .When I recently looked at the security of the fuse box part of the panel it seemed ok. I wii check again ASAP and let you know the result.

gala