Rear Fusebox Pinouts

[nenenaiad]

Hi,

Have just been looking for a diagram that describes what the spade connectors on the rear of the fusebox
refer to. I am after a 12 volt positive for a cigarette lighter.

There would appear to be some spare fuses and reference to the Wiki tells me that
G2 and G5 are ignition switched and g8 are dash lights but the others ??

Anyone know ?

Regards


Dave

[ewenmaclean]

Hello Dave,

if you want a 12V battery feed they're on the back of the fusebox on the left - X contacts are on the back on the right. Two lines of spade connectors.

Have a look here:

http://www.club80-90.co.uk/pages/downlo ... eneral.pdf

which has a pin out for the fuse box at the beginning of each section (e.g. p72)

Is that what you were after? Hope it helps.

Ewen

[nenenaiad]

Hi Ewan,

Had seen these in Bentley.

Which left ? and what does the X refer to ? I would have thought that some of the pins related to spare fuse positions, am I wrong about this ?


Regards and thanks for help so far


Dave

[ewenmaclean]

Hi Dave,

left as you look at the fusebox from sitting in the seat - if that makes sense!

The X-relay connections go through the load reduction relay and are only live when the ignition is on, and this relay is present. It's a way of reducing the load through the ignition switch.

Some of the pins do relate to spare fuses, but you might just have to get in there with a multimeter and figure it out! I did this when figuring some stuff out about the front fogs - this might give you some clue about how I went about it....

viewtopic.php?f=39&t=78992

Out of interest, what year van is yours? Do you know which fuse is intended for the cigarette lighter? According to this

http://www.brick-yard.co.uk/VehicleSpec ... /fuses.htm

it's fuse 3 for the early and 8 for the later vans. You could try soldering into the relevant and heatshrinking, as long as it's fat enough wire....

Ewen

[nenenaiad]

Hi Ewan,

My van is a an 86, 1.9 Diesel.

Looks like Fuse 3 for me, but am amazed that the spades on the rear are not designated.

Thanks for your help.


Regards


Dave

[Aidan]

the unused connections G are all used in production, but not all vehicles have the extra parts fitted, and some are fused, some are ignition switched, some have other connections internally on the fuseboard, if you sit and go through the bentley manual for hours you'll find out which is which - if using the X connections remember to fit a fuseholder in line to protect the rest of the circuit inc the relay

[nenenaiad]

Hi Ewen and Aidan,

Thank you both for taking the time to reply.

This all started with the simple job of fitting a cigar lighter so that I could use the satnav today.

Since raising the question I have since looked through Bentley as well as Haynes and the conclusions are as follows.

Seems to me that round about the time they fitted the fusebox to my car, they redrew the wiring diagram. This later digram shows a line representing the relay plate at the top of the diagram and the four buses namely 30,15,X and 31 above it. It is easy to see which bus is connected to what fuse etc, and therefore if the circuit is permanently live or switched etc. In my case I used the G2 pin which is switched via the ignition switch (15 bus)and is also fed by fuse S18.

I note also that the later type of diagram in Haynes for example also shows the several P connections connected to the permanent live from the battery, although with no number associated with them as indicated on the Fuse/Relay panel rear view.
As Aidan has said these should only be tapped into if using an in-line fuse rated for the circuit in use.

Thanks again..... got to my destination.


Regards


Dave.

[ewenmaclean]

Hi Dave,

thanks for getting back to us - glad you've sorted it. The only thing I would say is that I would personally not put a cigarette lighter through the 15 bus, since then all that current is going through the ignition switch which is known to get hot and fail. Either I'd do it direct from the battery (in-line fused of course), or from the X-bus, since then the relay deals with this high current.

In my understanding, the 15 rail is for things that need to be on when the engine is cranking as well as ignition on. I'd trust Aidan's advice in general though, and he might know better.

Ewen