Hymer S800 year 2007 " battery sense input disconnect" (1 Viewer)

Globo

Free Member
Nov 25, 2022
5
1
Funster No
92,610
MH
Hymer S800
Hello, Motorhome Hymer S800 with Reich II control unit, when I turn on the display it tells me: "battery sense input disconnect" my doubt comes from this cable that I show you in the picture and which is black but protected by fuse, probably that is the cable which should go on the + of the services battery? Thanks
 

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Globo

Free Member
Nov 25, 2022
5
1
Funster No
92,610
MH
Hymer S800
For completeness Reich E-box II control unit
 
Apr 27, 2016
6,562
7,425
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
The battery sense wire is a thin wire that runs right next to the much thicker main current-carrying wire from the battery. Because the main wire carries a large, varying current, there will be a small varying voltage drop along it.

To get an accurate battery voltage reading, this small wire carrying almost no current is wired next to the main wire, and is used to measure the battery voltage, and nothing else. It is often protected by a small fuse, maybe 2A or 5A, next to the main battery fuse. There is often also a similar sense wire on the negative terminal as well, because there is just as much voltage drop along the main negative battery wire. If either of these sense wires becomes disconnected, or the fuse blows, or gets a bit corroded, then the distribution box can't sense the battery voltage so causes all kinds of problems.

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Globo

Free Member
Nov 25, 2022
5
1
Funster No
92,610
MH
Hymer S800
grazie per la risposta, il filo in questione è sicuramente quello che ho trovato nella morsettiera x2 ed infatti è protetto da un fusibile da 2A, mi ero preoccupato di collegarlo al positivo della batteria perché è nero e il nero di solito è dedicato su impianti a 12v al negativo, quindi secondo te quello è il cavo da collegare alla batteria dei servizi al positivo?
 
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OP
G

Globo

Free Member
Nov 25, 2022
5
1
Funster No
92,610
MH
Hymer S800
thanks for the reply, the wire in question is certainly the one I found in the x2 terminal block and in fact it is protected by a 2A fuse, I was concerned with connecting it to the battery positive because it is black and black is usually dedicated on 12v systems to the negative, so do you think that is the cable to connect to the services battery positive?
 
Apr 27, 2016
6,562
7,425
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
I would certainly not use the colour of the wire as any indication of its use. True, black is often used for negative battery wires, but on my Hymer for example all the negative wires are brown, and in fact the leisure battery main positive wire to the distribution box is black. The one to the starter battery is red.

If it's got a fuse on it, it will more likely be going to the battery positive. Negative wires won't have a fuse on them.

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