Location of change over relay on Topaz

Hi, I have a 2007 model Topaz and have a problem with voltage readings between the leisure battery and the main control panel for water pump, lights.
I have had an auto electrician look at it and the battery is fully charged and producing 12v, but the control panel reading is only registering max of 6v, so the pump and lights are not working (though work ok when on hook up). the electrician thinks the issue is probably in the change over relay (see circled part of attached wiring diagram), but I am not sure where this is located.
Does anyone know where this is located on the 2007 model, and how to get to it?
Any advice gratefully received.[You must be registered and logged in to see this link.]

Frederic should be able to confirm, as he has the same model and similar year, but I ~think~ this part of a Topaz is the same as a Trooper. If that's correct, the two fuses and relay should be under the battery cover at the right hand end of the engine bay, attached to the back of the bonnet slam panel.

Yes I think you are right. I have electrolubed the fuse contacts but don't think  I removed the relays, only applied the lube to the spade ends the relays were in tight and care needed to remove them using a non conducting lever/wedge mine were working fine so left well alone
frederic

Thanks for the replies, I will check those fuses

Managed to find the issue. One of the relays was kaput, so replaced it and all is now working again.
Thanks for your help Roopert and Frederic

That's what it's all about now I need to find out how to  change out the high level tailgate brake light!!
Quality suppliers recommendations  welcomed.

frederic

If my experience is anything to go by, there are really only two types - the cheap Chinese copies available on Ebay for about £12, or the VW originals from a dealer or TPS (which if you're not aware is the VW owned VAG parts supplier to the trade). Last time I looked the originals were ~£30.

The copies are not fantastic, but workable. The one that I bought had rather pronounced moulding ridges, and I had to trim down a bit, but I think it's been on around 4 years and still working Ok. I re-used the original seal, as it was better quality than the one on the copy.

The two fixing screws are inside - probably under the interior trim on a Topaz.

Be warned - there is one error that you can make that is really annoying. If you push too hard on the fixing screw as you fix the new one, you can displace the spring clip on the inside, and the screw then just turns without tightening! As I found out the hard way, it's not very easy to fix if you do that...