WVvan wrote:
Webasto is a German company but they have an American branch.
Webasto US webpage
The company also has a tech web page where you can download all the different installation and operational manuals in English .
This is a link to the installation manual for the Air Top 2000 (pdf).
The unit has a negative ground.
There is another German company that makes a similar product. The company's German name is Eberspacher (the "a" should have two dots on top) but they use the name Espar in America and Canada.
Here's Espar's web page.
Next week I'm getting an Espar Airtonic D4 installed under a sofa/bed.
http://www.espar.com/html/products/airtronic4.html