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 Post subject: Switch charge relay question
PostPosted: Wed May 17, 2017 7:01 pm 
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I'm having all sorts of issues with the 12v system.

I've put in a new relay switch today and I'm assuming it's a fridge relay because it has a thick blue wire going into it. I'm assuming the red wire is to the leisure battery, the green wire is to the ignition and the black is an earth.

Is that right? How does that take power from the engine battery when it's running?
At the moment the zig is only taking power from the leisure battery which is not getting charged when the engine is running.

There's another, bigger box next to the relay switch I replaced today, is that also a relay? It says G Cartier and prechauffage is written on it. There is a thick brown wire from the battery going into into the Zig from what I can see. There's another thick brown wire with a 25a inline fuse (which I had to replace) going to the zig from what I can see. Should the leisure battery and the engine battery be going into the same relay?

I've taken some voltage readings from the leisure battery terminals and the zig

Leisure battery terminals:

Engine running, 12v off zig set to touring = 11.89

Engine running, 12v on, zig set to touring = 5.73

Engine off, 12v on, zig set to on site = 0.05 and the zig light goes off

Zig unit readings from battery connections:

12 v off, touring, 12.14 from engine battery, 12.16 from leisure battery

12v on, touring, 7.88 from engine battery, 11.06 from leisure battery

12v on, on site 12.14 from engine battery, 0.06 from leisure battery and the zig light goes off.

None of the habitation lights are working


Can anyone tell me what is going on? I REALLY need some input.


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 Post subject: Re: Switch charge relay question
PostPosted: Wed May 17, 2017 8:54 pm 
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The big G. Cartier box is the glow plug relay so not connected to this issue. I can't make any sense of your readings though. Does your engine battery read over 14 volts with the engine running?

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 Post subject: Re: Switch charge relay question
PostPosted: Wed May 17, 2017 8:56 pm 
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Yeah, I'm a bit confused over the readings too, as Chris suggests I think maybe start from the top and make sure the alternator is charging.

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 Post subject: Re: Switch charge relay question
PostPosted: Wed May 17, 2017 9:01 pm 
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If those voltage readings are correct from your LB I'd get it on charge ASAP.

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 Post subject: Re: Switch charge relay question
PostPosted: Wed May 17, 2017 9:09 pm 
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I had to wire a split charge relay for my fridge the other week...from memory I think this was how it was wired...

I had a 4 pin relay, numbers next to pins on relay...

Pin 30 was live feed from battery,

Pin 85 was ground, I went direct to body...

Pin 86 was the small battery wire from alternator, once engine starts turns relay on...

Pin 87 was to fridge...

Split charge for 2nd battery i think it could be wired like this...

30 to battery 12v+ fused...

85 to 12v- the body near relay...

86 to battery light wire on alternator,

87 to leasure battery...

I'm not great with electrics and only just got my motorhome so learning myself...
Hopefully someone will be along soon who knows more...

Hope you get van sorted...


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 Post subject: Re: Switch charge relay question
PostPosted: Wed May 17, 2017 9:10 pm 
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I've just checked the engine battery and it's 11.97 with the engine running


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 Post subject: Re: Switch charge relay question
PostPosted: Wed May 17, 2017 9:15 pm 
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It should be closer to 14v with engine running...
Mine you have to rev it once for battery light to go out and start charging...


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 Post subject: Re: Switch charge relay question
PostPosted: Wed May 17, 2017 9:17 pm 
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Fairladyz wrote:
It should be closer to 14v with engine running...
Mine you have to rev it once for battery light to go out and start charging...


I'll get my boy to rev it tomorrow while I test it. I've been starting the van on and off all day so it may take a few minutes to reach 14?


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 Post subject: Re: Switch charge relay question
PostPosted: Wed May 17, 2017 9:21 pm 
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On mine when I 1st start battery light on dash stays on...
I rev it once and light goes out and it starts charging after that...
Hopefully you sort it tomorrow...


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 Post subject: Re: Switch charge relay question
PostPosted: Wed May 17, 2017 9:48 pm 
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Fairladyz wrote:
On mine when I 1st start battery light on dash stays on...
I rev it once and light goes out and it starts charging after that...
Hopefully you sort it tomorrow...


Same with mine, never used to do it! was hoping a new belt properly tensioned would cure it but it still does it

Make sure the battery light goes off once running and test the voltage at the battery.. Hopefully your alternator is charging.

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