Roots Supercharger

P.S. My Superb only thumps/bonks through it's speakers when the engine is switch off, otherwise with the engine running the alternator will raise the battery voltage and stop the noise.

I stop my Superb thumping through the speakers by charging the battery. I have not driven the car for the last month because of the salt that's put on the roads ( I drive the wife's KIA instead). A few days ago the Superb was thumping away to warn me the battery needed charging . I charged the battery and all is now peace.

Yes, changing the relay cured the problem, the car is running and starting as it should. I now carry a spare just in case.

With my car it is a warning that the battery voltage is getting too low. It happens to me when I Hoover the car out and I have left the doors open, with their lights on, for too long.

i would check the alternator pulley clutch. it

Hatch not opening is one indication that there is a problem with the LHS boot hinge wiring. Read the helpful Briskoda how to guide 'Skoda Superb Guides' under the heading of 'Superb Twin Door Wiring Fix', I think it might help you.

Read the very helpful Birskoda, Skoda Superb Guides article 'Superb Twindoor Wiring Fix'. This might be your problem, it was mine.

Is your Superb a MK11 Twindoor? I have just repaired the wiring to the boot at the LHS boot hinge of my 2009 Mk11Twindoor. About 5 wires were bare and/or broken. I had a fluctuating parasitic drain of 1.5 to 12 amps. The wiring at the boot hinge is a well known problem and I now only open the back as a hatch.

I get the same symptoms when I hoover my Skoda. It is a warning of low battery voltage because I have all the doors open and the radio on.

From new, my Superb 11 came without chrome door trim. I added OE chrome trim to the doors and it came fitted with double sided strong glue tape. No rivets were used or required.

I am happy with my Tayna AGM Exide EK700.