No power going to leisure battery (1 Viewer)

OP
OP
P
Oct 18, 2022
6
4
Funster No
91,960
MH
hymer
I’ve only just purchased the van and it’s charging the leisure battery when plugged into mains but not when the engine is running I’ve not found any blown fuses
 
Apr 27, 2016
6,954
8,125
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
There are a number of things you can check. First is the big fuse, maybe 30A or 50A, near the leisure battery, on the thick wire going from the leisure battery to the EBL distribution/fusebox. Also next to that fuse is a small 2A fuse on a thin wire. Worth checking while you are there, but that's rarely a problem.

The habitation circuits all come from a distribution/fusebox labelled Schaudt Electroblock, with an EBL number. What is the model number of the Electroblock (EBL)? The EBL sometimes is hidden away in a cupboard.

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OP
OP
P
Oct 18, 2022
6
4
Funster No
91,960
MH
hymer
I’ve found the distribution box (in a cupboard)
Checked both fuses no problem there
I’m working now so I’ll look for a model no m
Tonight
 
Apr 27, 2016
6,954
8,125
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
I’ve only just purchased the van and it’s charging the leisure battery when plugged into mains but not when the engine is running I’ve not found any blown fuses
The other thing to check is the big fuse, maybe 30A or 50A, near the starter battery, on the thick wire from the starter battery to the EBL. The alternator charge goes along this wire, through the EBL, and out along that other thick wire I mentioned above. But if the leisure battery is charging when EHU is plugged in, that leisure battery fuse will be OK, I think.

Also next that starter battery fuse there might be another smaller fuse, 2A or 5A, for the engine running (D+) signal. This signal triggers the relay that connects the starter battery to the leisure battery when the engine is running, so that the alternator can charge both batteries.
 
Last edited:
Feb 19, 2018
5,095
86,648
EAST ANGLIA
Funster No
52,484
MH
Murvi Morello
Exp
Since 1975
There are a number of things you can check. First is the big fuse, maybe 30A or 50A, near the leisure battery, on the thick wire going from the leisure battery to the EBL distribution/fusebox. Also next to that fuse is a small 2A fuse on a thin wire. Worth checking while you are there, but that's rarely a problem.

The habitation circuits all come from a distribution/fusebox labelled Schaudt Electroblock, with an EBL number. What is the model number of the Electroblock (EBL)? The EBL sometimes is hidden away in a cupboard.

I know little of electricity but on the limited information the OP has given, how do you know it's a Schaudt Electroblock???
Not criticising, just trying to learn. :unsure:
 
Apr 27, 2016
6,954
8,125
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
I know little of electricity but on the limited information the OP has given, how do you know it's a Schaudt Electroblock???
Not criticising, just trying to learn. :unsure:
In his avatar he says it's a Hymer, and all the Hymers I've seen have an EBL, including mine.

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OP
OP
P
Oct 18, 2022
6
4
Funster No
91,960
MH
hymer
I’ve checked fuses at the van battery and the leisure battery all ok !!
It’s an older model van and the name on the fuse box is
Elektroblock ebl 104
 
Dec 24, 2014
9,318
48,104
Hurstpierpoint. Mid Sussex.
Funster No
34,553
MH
Compass Navigator
Exp
Ever since lighting was by Calor gas.
Yea I’ve done that. Van battery charging but not leisure
There's a limit to the effectiveness of diagnosing faults by proxy on a keyboard. If all the fuses are intact (they need to be checked for continuity with a meter, not just visually), you'll have to trace the voltage from the power source to the leisure battery and identify where it stops flowing.
 
Apr 27, 2016
6,954
8,125
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
Do you have the circuit diagram for the EBL104? As you say, it's an early version. Later versions of the EBL have a manual with instructions, and a diagram, but the EBL104 just has a diagram.

The power from the starter battery (Batt1) comes into the EBL on the 9-way connector, Pin3 & 6. They are doubled up because it's a high current, up to 30A, and the pins only take about 15A each. The negative comes in on Pin1 & 4. You could check that you are seeing the starter battery voltage at these pins.

The power out to the leisure battery (Batt2) goes out on Pin2 & 5. You could check that you are seeing the leisure battery voltage at these pins. I presume it will be OK, otherwise the habitation circuits wouldn't be working.

With any luck, the starter and leisure battery voltages will be slightly different, and you should be able to tell which is which.

If those check out OK, the next thing to check is the engine running (D+) signal, which comes in on the same 9-way connector, on Pin7. It should be about zero when the engine is stopped, and about +12V when the engine is running. Note that it doesn't come on when you turn the ignition key, but only when the engine is turning and the alternator is sending out power.

The D+ signal has a 2A fuse, I'm not sure where, but I'd guess it's next to the starter battery 30A fuse. So if there's no D+ signal you could check that fuse.

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Last edited:
Oct 13, 2016
1,056
898
Grays - Essex - UK
Funster No
45,568
MH
Mercedes Hymer B680
Exp
Been moho’ing for a time now
This may sound odd, but if you find the ebl unit squirt some wd40 into the main switch and switch it on and off a few times, worked on mine 👍😉 my ebl unit is under the passenger seat
 
OP
OP
P
Oct 18, 2022
6
4
Funster No
91,960
MH
hymer
Do you have the circuit diagram for the EBL104? As you say, it's an early version. Later versions of the EBL have a manual with instructions, and a diagram, but the EBL104 just has a diagram.

The power from the starter battery (Batt1) comes into the EBL on the 9-way connector, Pin3 & 6. They are doubled up because it's a high current, up to 30A, and the pins only take about 15A each. The negative comes in on Pin1 & 4. You could check that you are seeing the starter battery voltage at these pins.

The power out to the leisure battery (Batt2) goes out on Pin2 & 5. You could check that you are seeing the leisure battery voltage at these pins. I presume it will be OK, otherwise the habitation circuits wouldn't be working.

With any luck, the starter and leisure battery voltages will be slightly different, and you should be able to tell which is which.

If those check out OK, the next thing to check is the engine running (D+) signal, which comes in on the same 9-way connector, on Pin7. It should be about zero when the engine is stopped, and about +12V when the engine is running. Note that it doesn't come on when you turn the ignition key, but only when the engine is turning and the alternator is sending out power.

The D+ signal has a 2A fuse, I'm not sure where, but I'd guess it's next to the starter battery 30A fuse. So if there's no D+ signal you could check that fuse.
Hi
Thanks for all your help. I think I’ve sorted it a broken wire on the feed to the 2amp fuse
 

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