Hi
If you are running a new wire, make sure the old one is disconnected both ends first !!!!....you don't want any shorting!
Also, if you disconnect the roof light, it MAY affect your alarm if you have a voltage-sensing one!
Easiest route for cable:
Push a stiff wire from the hole for the cab-light towards the windscreen, until it pops out from the headlining in front of the screen....To the other end, tape the wire you are using for the light to the stiff wire, and pull through....allowing plenty to go from the light, across the front screen, down the pillar, and towards the Leisure battery. The wire will just poke up under the front edge of the headlining...EASY...
Pull the rubber door aperture surround off from the headlining down past the dash, and with luck and some jiggling, you should pull the wire towards the gap now visible in the pillar trim Push the rubber trim back on when the wire emerges under the dash.
From under the bonnet, behind the Leisure battery, you will see a big rubber grommet....Poke a hole in this with something, and then push a small funnel into the hole (or a gun-sealant nozzle)...then poke some scrap wire through the funnel, until you can grab it, tape securely to the wire you fed from the light, and pull back through, until you touch the funnel....then withdraw the funnel and wire.
Connect to a fuse, and off you go!
I can't remember the value of the lights, and it's pee-ing with rain, so I'll leave you to find the value of the bulbs and fuse accordingly!
!5 minute job!
I have about 8 wires running to an overhead console running that very route!....piece of cake!
Cheers
Helen
In the beginning there was nothing , then God said "Let there be Light".....There was still nothing , but ,by crikey, you could see it better.