LD10 wiring diagram

[mikemillen]

I have a copy of Trader Sheet 138 which covers the Lanchester 10, 1947-1947.
It includes a wiring diagram, but I can't be sure of its accuracy.

Can anyone point me in the right direction for a genuine Lanchester wiring diagram covering the 2nd series LD10?

I'm trying to solve a problem with the horns on my car. The -ve 12v feed to them has obviously got a high-resistance somewhere in it.
It measures 12v until the horn button is pressed, whereupon it drops to zero.
The horns work fine if I provide a new -12v feed.
As far as I know so far, the wire goes through a "bullet" connector on the scuttle and then to the "A" terminal on the control box.
I've checked both those connections and they seem to be OK, so I'm wondering if there's another joint I don't know about.
The only alternative I can think of is that there's a partial break inside the loom somewhere, though I think that's very unlikely.

[watkindj]

[Simon Hyslop]

I'm somewhat puzzled by this. I know what the diagram says and to be honest, I'd need to check on the internals of an RF91 but if it were an RF95, which I have on mine, the horns are wired to A2 so they are fused through the A1/A2 fuse. I've had a look at a wiring diagram for another car using an RF91 box and it shows that particular model having the horn wired to A4, the ignition switch controlled circuit.

[mikemillen]

Not A but A2. They need to be fused !

Well they're fed from "A" in the Lucas diagram and Trader sheet, and "A" on my car.
No fuse in circuit.

[mikemillen]

lucaswire.gif

Many thanks, Darren.

[watkindj]

this is the RF 95 setup as on the Barker as Simon says its fused at A2

LD10 Wiring Diagram (Barker).pdf

(428.2 KiB) Downloaded 30 times

[watkindj]

this information is an upcoming section to the website as soon as i iron out the kinks in the layout diagram

[Simon Hyslop]

I appreciate what the diagram says but I'd question the accuracy or the wisdom of only having an interior light fused through the A2 connection and no fuse at all for the horns. I've had a look at the diagrams for a couple of other cars using an RF91 and they all have the horns fused.

[mikemillen]

this is the RF 95 setup as on the Barker as Simon says its fused at A2LD10 Wiring Diagram (Barker).pdf

That looks safer, but the Briggs version is quite different.
It has an RF91, though I don't think that influences the rest of the wiring much.
Is that an "offical" diagram or has someone drawn it up?

Notwithstanding that, as I've got to be disconnecting wires anyway, I'm inclined to rewire it to make better use of the fuses.
I quite agree that dedicating a fuse just to the interior light doesn't make a lot of sense!

[watkindj]

I appreciate what the diagram says but I'd question the accuracy or the wisdom of only having an interior light fused through the A2 connection and no fuse at all for the horns. I've had a look at the diagrams for a couple of other cars using an RF91 and they all have the horns fused.

Including the DB18 which has a fuse bank to complicate the whole issue