No power going to leisure battery

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
 
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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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
 
philthai said:
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
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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.
 
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autorouter said:
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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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:
 
If it is on a Fiat post 2006 the 50 amp fuse is in the battery box under the cab floor LHS. (drivers side LHD, passenger side (RHD)
 
L' Hobo said:
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:
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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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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
 
philthai said:
Yea I’ve done that. Van battery charging but not leisure
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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.
 
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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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
 
autorouter said:
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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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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