Sudden loss of 12v power

Camperian

Free Member
Dec 1, 2007
100
0
Dorset - 6months, Spain - 6months
Funster No
950
MH
A Class
Exp
2 years
Been on HU for the last 2 months, so decided to run the main engine to give the vehicle battery a charge.:Smile:

Wouldn't start on ignition, but started comfortably on aux battery.

Everything was fine for ten mins or so and I decided to drop the jacks. The dash which had been showing an initial charge of 13+ amps suddenly jumped to zero.

No vehicle system now at all, no headlights, indicators, side lights, dash lights including warning lights. Everything else is fine.:cry:

Removed battery and put meter across (thanx KANDS for showing me how to use it) and it shows anything from 8v upwards each time I tested it:RollEyes:

Now put it on booster charge overnight.

Fleetwood Southwind 1995
Chevy 7.4L petrol

Any ideas?

Ian
 

American Dream

Free Member
Aug 20, 2007
6,371
154
Lincoln
Funster No
125
MH
?
Exp
?
Have you blown a fuse?

Any corrosion on the main vehicle battery terminals?

You've been on EHU for 2 months.Has the vehicle battery been charged during this time.8V across terminals suggest a dead battery.

Check usual things.Battery terminals clean and tight.Battery to chassis earthing good and connections clean.Fuses.
 
Last edited:

pappajohn

LIFE MEMBER
Aug 26, 2007
37,279
26,783
Dark side of the moon
Funster No
172
Exp
Since 2005
anything less than around 9.5volts and you have a plastic box with some lead in it to stop it blowing away.:ROFLMAO:
even if you get a 12v/13v reading straight after charging it the chances are it will discharge as soon as you turn on the ignition.:Sad:
new battery needed i think.

john.

ps...... dont forget your leisure battery is designed for slow discharge not the 500/600ah needed to crank a cold engine so you will damage your leisure battery.

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Last edited:

scotjimland

Free Member
Jul 25, 2007
32,019
29,473
.
Funster No
15
MH
.
Exp
.
I agree with Pappajohn , below 10v the battery will probably never recover. .

Fit a new battery then check the voltage with the engine running, should be around 14.4v , if not check for a blown fuse.
 
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