Can't paste drawings or photos even if I had one so your options?
1. Buy a workshop manual From £19.99
2. Ask local library if they have workshop manuals.
3. Wait for someone who's wired up their Vectra.
4. Go to www.emanualonline.com download Vectra [if its for your model] workshop manual in pdf form for £9.99 click at top on 'contact us' if you are not sure if it's the right manual. I searched for you for this site.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix caravans/motorhomes.