In an earlier contribution to this discussion,
Hamish Alker-Jones said:
I should have explained that I was curious to see where the wiring
loom for the towing electrics comes in, and where I could get a feed
(with extra fuses) to have a power outlet in the boot.
When I wired my V70 for towing, I used the Volvo kit (which I think is the
same for S70 and 850s) which made life very easy because it has
plugs/sockets which plug straight onto the wiring harness. You have tgo be
bery careful how you connect some of the lights so as not to upset the bulb
failure detection device. The kit does it by providing a "sandwich" which
plugs into the harness next to the device.
On the V70 at any rate, there is a connector near the rear lights with a
very hefty live wire in it which - by default - is only used to power the
window-mounted radio arial. You can use this as a live feed for other
things.
While on the S70, do you have a full size spare or the space saver in
the boot? I'm looking at getting a steel rimmed 940/960 so that I
continue on my merry way if one becomes damaged. My sister in law
has the LPT S70 and has a factory alloy (16") in the boot, so I guess
a 15 " will be of no problems. It measures up.
My V70 was supplied with a "space-saver" spare - but the spare wheel
compartment can easily accommodate a full-size spare. I bought a second-hand
rim from a breaker's yard (alloy to match the originals - but I would have
settled for a steel one).
Not all variants use the same wheel size. Mine are 195/60x15. Some cars use
16" or even 17" wheels, usually with lower profile tyres - so the overall
diameter is similar, but the width may be greater. Try one of your road
wheels in the compartment and, if it fits, try to get another one the same.
Be very careful if you buy a wheel intended for a rear wheel drive car -
because the offset may be different.