There are a couple of random wires hanging about back there that I was
testing last night to see if they carried any power, none of them carry
any power so it looks like I will have to draw the power from the
pre-regulated speedo connection.
cheers
John
--- Richard Gosling <richard.gosling@exprogroup.com> wrote:
> Almost - they are 10V, and although they are ignition switched, the
> supply
> passes through a voltage regulator to fix the voltage at 10V. This
> prevents
> the guages varying their readings as the exact battery voltage varies
> (i.e.
> as a result of changing alternator output with engine speed).
>
> There was a dedicated switched supply for the radio built into the
> wiring
> loom, but this may have been lost or cut off somewhere in your cars
> history!
> Have a look, however, there may be a wire hanging around behind the
> dash,
> probably terminating in one half of an in-line fuse connector.
>
> Failing that, you probably want to take a supply from the +ve leading
> INTO
> the voltage regulator. You should find the voltage regulator trapped
> under
> one of the nuts that holds the speedo in place - a small metal box
> with two
> terminals on it.
>
> Richard & Daffy
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