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Leisure Battery Charging. Riddle me this...

Richp

Richp

Messages
42
Location
Essex
Vehicle
T5 SE 180
2012 SE California.
Leisure batteries both new.
Leisure batteries charge on EHU
They don't charge when van driven.
Van is not a bluemotion.
Central control panel does show the G in circle when being driven.
Obvious place to check first is the Split Charge Relay.
I've done some testing with a meter, and the split charge relay appears to works.
The engine battery is only showing 12.4v despite a 700 mile drive last week, so low?
The engine battery charge increases to 13.6V with engine running, so I deduce the alternator is working.
With engine off. The input to the relay from the engine battery is showing 12.4V.
The output, to the leisure batteries is showing the same, 12.4V.
With the engine running, the input to the relay doesn't change, it remains at 12.4V, it doesn't increase to the 13.6V the engine battery is showing (with alternator) which you would expect?
So the leisure batteries are not being charged when the engine is running.
They do charge on EHU.
I'm at a loss to work out what's going on, so really appreciate any assistance.
All I can think is that the engine battery is not achieving sufficient charge for the power to divert to the leisure batteries. Is there a smart module between the engine battery and leisure battery relay which stops any charge divert unless the engine battery is optimised for charge?
Thanks for any advice.
 
VW Guru

VW Guru

Messages
562
Location
Uk
Vehicle
T6 Ocean 204
Hi does the voltage change on the input wire to the split charge relay from the main battery with the engine running ? If it does but the output wire to the leisure battery’s is still at 12 volts or less then your relay has had it. If the voltage at the input wire does not change engine running then the fuse in the electrics box under the battery has blown.
 
Richp

Richp

Messages
42
Location
Essex
Vehicle
T5 SE 180
The voltage at the input wire does not change when the engine is running. So that means the fuse in the electrics box has blown then? Can you point me in the direction of that fuse please?
 
VW Guru

VW Guru

Messages
562
Location
Uk
Vehicle
T6 Ocean 204
The voltage at the input wire does not change when the engine is running. So that means the fuse in the electrics box has blown then? Can you point me in the direction of that fuse please?

Hi yes the fuses are well hidden so I hope your handy with a ratchet sockets and a screwdriver. The fuses are in the EBox under the battery so you need to remove the battery, the battery tray and the top of the ebox cover held in with approx ten screws, un clip the small fuse box from inside the front right of the cover and lift the cover off. Under that you will find a mass of wires and the main battery fuse box with ten strip fuses in it. I cannot remember the number for the fuses but they are clear so it will be obvious. I can give you the exact fuse number and amperage tomorrow when I’m back at work if you want to order a fuse before you take it all apart.
 
Richp

Richp

Messages
42
Location
Essex
Vehicle
T5 SE 180
Thank you very much.
I'll wait for you to give me the fuse number info.
Idiot question, but I assume the fuse box is under the engine battery, not leisure?
 
Richp

Richp

Messages
42
Location
Essex
Vehicle
T5 SE 180
I have a sizeable fuse box also under the ashtray pull out on the dashboard, is that a different one? Or fingers crossed, on my model is it the same box but in a more accessable place?
 
VW Guru

VW Guru

Messages
562
Location
Uk
Vehicle
T6 Ocean 204
Nope it’s definitely under the battery in the ebox on all transporter based models
 
VW Guru

VW Guru

Messages
562
Location
Uk
Vehicle
T6 Ocean 204
Oh and yes sorry it’s under the engine battery. :thumb
 
WelshGas

WelshGas

Retired after 42 yrs and enjoying Life.
Top Poster
Lifetime VIP Member
Messages
19,754
Location
United Kingdom
Vehicle
T5 SE 180 4Motion
I have a sizeable fuse box also under the ashtray pull out on the dashboard, is that a different one? Or fingers crossed, on my model is it the same box but in a more accessable place?
This is the location of the Fuse Box. Ignore first 20 secs or so of the video.

 
Richp

Richp

Messages
42
Location
Essex
Vehicle
T5 SE 180
Thanks guys for your help. VWGuru, if you can give me the fuse details today I'll chase that down Thanks
 
Loz

Loz

Top Poster
Lifetime VIP Member
Messages
5,456
Location
Berkeley Gloucestershire
Vehicle
T6 Ocean 204 4Motion
The voltage at the input wire does not change when the engine is running. So that means the fuse in the electrics box has blown then? Can you point me in the direction of that fuse please?
only blown if there is no volts when the engine is stopped and the relay open.
 
Richp

Richp

Messages
42
Location
Essex
Vehicle
T5 SE 180
When the relay is open and engine stopped, meter reads 12.4V, but that could be the back charge from the leisure battery, so will take a read with the leisure battery disconnected, and can I assume if there is no read then, that the fuse has gone?
 
Loz

Loz

Top Poster
Lifetime VIP Member
Messages
5,456
Location
Berkeley Gloucestershire
Vehicle
T6 Ocean 204 4Motion
When the relay is open and engine stopped, meter reads 12.4V, but that could be the back charge from the leisure battery, so will take a read with the leisure battery disconnected, and can I assume if there is no read then, that the fuse has gone?
no, with the engine stopped the relay should be open and the leisure batteries disconnected. So if there is power on both sides of the relay the main fuse is good.
 
Richp

Richp

Messages
42
Location
Essex
Vehicle
T5 SE 180
Currently, with the engine stopped, I get a reading of 12.4V on both sides of the relay, with the leisure battery connected.
With the engine running, I get 13.6V at the engine battery, but no increase on the input to the trip, it still shows the 12.4V? Confused by this.
 
Richp

Richp

Messages
42
Location
Essex
Vehicle
T5 SE 180
So is it possible that the fuse has gone, and the reading on the leisure battery is a back feed from the leisure battery, which is why it never changes?
 
Loz

Loz

Top Poster
Lifetime VIP Member
Messages
5,456
Location
Berkeley Gloucestershire
Vehicle
T6 Ocean 204 4Motion
There are 3 fuses; the 100A under the starter battery then another under the seat and a third on the rear battery post.
Does this help?
1565173098405.png
 

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