I'm sure there is an easier way to do this and maybe I will work this out one day.
The simulator is made up of a number of individual componets which are all required for it to work.
Determine where you intend to save the files. I suggest that you create a directory on your computer in your document directory called RT_SIM.
Click on the documents button or the my computer button and navigate to where you want to put the files.
Right click in folder and select "new" and then folder. Be sure and give it a name such as RT_SIM.
Right click on this link and save the file to your computer.
Locate the file and double click to uncompress the archive, be sure and place the files in the correct location.
Your antivirus software may balk at the file named "rewrite.js"
Okay now double click on electrical.htm and your browser should open.
On IE you may get a script warning, allow the script to run by confirming that it's okay.
Now everything should work locally.
If you find a bug, let me know and I will get it fixed.
2002 Chevy 190V