Is there an easy way to detect a bad earth or am i in for a long weekend???

I have a 1987 RR V8 EFI.

I think its Fuse 13 that keeps blowing as soon as you put a fuse in. Even a
25amp one will pop immidiatly..

the only thing I can think of is that there must be a bad earth somewhere on
the wiring loom. This means that I have no brake lights, indicators or
difflock light (OMG!!).


Where the hell do I start to look to find the offending wire!!!!

Thanks,


Mark.

"Mark Solesbury" <notreallymyemailaddress@Idontwantspamsenthere.com> wrote in message
news:cdg9ls$rn0$1@hercules.btinternet.com...
> I have a 1987 RR V8 EFI.
>
> I think its Fuse 13 that keeps blowing as soon as you put a fuse in. Even a
> 25amp one will pop immidiatly..
>
> the only thing I can think of is that there must be a bad earth somewhere on
> the wiring loom. This means that I have no brake lights, indicators or
> difflock light (OMG!!).
>
>
> Where the hell do I start to look to find the offending wire!!!!
>
> Thanks,
>
>
> Mark.
>

Make up a test light with a 12v 21w bulb connect this
to two lengths of wire with two spade connectors on
the ends and plug this in place of the fuse if you remove
all the plugs to bulbs and switches if it lights up bright
then you've got a short to earth if not keep plugging
thing in till it lights up

Andy

--
SWB Series 2a ( dressed as a 3) "Bruce"
It's big it's mean it's really really green

"Mark Solesbury" <notreallymyemailaddress@Idontwantspamsenthere.com> wrote in message
news:cdg9ls$rn0$1@hercules.btinternet.com...
> I have a 1987 RR V8 EFI.
>
> I think its Fuse 13 that keeps blowing as soon as you put a fuse in. Even a
> 25amp one will pop immidiatly..
>
> the only thing I can think of is that there must be a bad earth somewhere on
> the wiring loom. This means that I have no brake lights, indicators or
> difflock light (OMG!!).
>
>
> Where the hell do I start to look to find the offending wire!!!!
>
> Thanks,
>
>
> Mark.
>
>

More likely to be a short circuit.