no 12V power (1 Viewer)

pats

Free Member
Feb 12, 2023
6
0
Funster No
93,947
MH
740 Autograph aproac
2015b Bailey 740 Autogtraph
I have no 12V power, The control panel is completely dead when unplugged from the EHU, all works fine on EHU, The leisure battery is fully charged, checked with multi meter, I've searched high & low but cant find any fuses, apart from the normal fuses on the PDU.
Its driving me mad! Help!
 
OP
OP
P

pats

Free Member
Feb 12, 2023
6
0
Funster No
93,947
MH
740 Autograph aproac
Theres no fuse in here??

16761974340144086632827078476374.jpg

Subscribers  do not see these advertisements

 
Upvote 0

Lenny HB

LIFE MEMBER
Oct 18, 2007
50,087
137,802
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
Ok you have volts at the battery so check the voltage where the leads from the batteries go into the distribution unit, if there are no volts there it must be a blown fuse.
If you have volts there it is most lightly to be either a distribution unit fault or a control panel fault.
 
Upvote 0
Oct 14, 2007
3,895
5,834
Rochester
Funster No
619
MH
Auto-Trail Mohawk
Exp
16 fun filled years
Those wires will end up at the distribution box. As@Lenny HB said check there, If no 12V work your way back to the battery.
 
Upvote 0
Feb 19, 2018
4,091
77,312
EAST ANGLIA
Funster No
52,484
MH
Murvi Morello
Exp
Since 1975
If it's on a Stellantis made vehicle, (Fiat etc) I would be checking all the earth connections too.
 
Upvote 0
Nov 4, 2021
25
28
Saundersfoot, Wales, UK
Funster No
85,281
MH
coach built
Exp
2010
2015b Bailey 740 Autogtraph
I have no 12V power, The control panel is completely dead when unplugged from the EHU, all works fine on EHU, The leisure battery is fully charged, checked with multi meter, I've searched high & low but cant find any fuses, apart from the normal fuses on the PDU.
Its driving me mad! Help!
There is an inline separate from the battery and the charging unit on our 794 itā€™s under the front facing rear seat. I think its a 20amp if my memory serves me correctly.
 
Upvote 0
Aug 30, 2021
36
9
Plymouth, UK
Funster No
83,821
MH
Fiat ducato lagan
Ok you have volts at the battery so check the voltage where the leads from the batteries go into the distribution unit, if there are no volts there it must be a blown fuse.
If you have volts there it is most lightly to be either a distribution unit fault or a control panel fault.
I recently posted a similar query. The mechanic suspected the control panel circuit but it was an isolation switch. It was driving me mad replaced all the fuses I could find . Sometimes it's better just to a motorhome auto electician, they solved it by process of elimination.
 
Upvote 0
Jul 23, 2022
6
0
Funster No
90,091
MH
Elddis Autostratus
Hi,
Just had a very similar problem. No 12v, including no 12v fridge when driving, but full 12v on mains hook up. It turned out to be the leisure battery lead/s from leisure battery to fusebox. The negative wire had come out of one connection, so the leisure battery was not connected. Once screwed back in the 12v system worked as it should. The separated connection was hidden under a bunch of wiring so was not immediately apparent.

I think what was happening was the 12v system was earthing through the Zig unit on mains connection, and in effect the Zig was trying to charge the 12v system.... So, the Zig ran the 12v system on mains as the leisure battery was not connected due to the negative wire having disconnected itself from the leisure battery.

I am not an electrician as such, so my explanation maybe incorrect, but it worked for us and I think explains what happened in our case.

The fridge not working when driving maybe the tell tail sign as I think it is only allowed to draw power from the leisure battery when the engine is running and the alternator is charging the leisure battery. If the leisure battery lead/s is broken / disconnected then the fridge cannot work..

Hope this helps.
 
Upvote 0

Join us or log in to post a reply.

To join in you must be a member of MotorhomeFun

Join MotorhomeFun

Join us, it quick and easy!

Log in

Already a member? Log in here.

Latest journal entries

Funsters who are viewing this thread

Back
Top