Where might I obtain intertherm electrical furnace E2EB-012HA wiring diagram?

Here are the manuals and materials you need: https://dl.dropboxusercontent.com/u/8010163/Carrier%20and%20Heater%20manuals.zip
https://dl.dropboxusercontent.com/u/8010163/HVAC_ELEC-2.mp4
https://dl.dropboxusercontent.com/u/8010163/HVAC_Troubleshooting.pdf
https://dl.dropboxusercontent.com/u/8010163/Electrical%20Theory%20and%20Diagnosis%20of%20Major %20Appliances%20Service%20Manual.pdf
https://dl.dropboxusercontent.com/u/8010163/Electronics%20and%20Electrical%20Troubleshooting%2 0and%20Repair%20Handbook.pdf
Buy a good meter first and learn to use it. Almost all heaters are the same; all you need to do is to learn the components and how they are wired together.