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Free wiring diagrams at BBB Industries. Not always best quality, but a huge free database, going back to 1986 models. http://www.bbbind.com/technical.html Click on the box saying "Technical Service Bulletins & Wiring Diagrams".
Try this link: https://www.google.com/search?newwindow=1&client=firefox-a&rls=org.mozilla:en-US:official&channel=sb&tbm=isch&q=wiring+diagram+for+a+coleman+presidential.+7700+heating+only+furnace+model+7700B+series+856&spell=1&sa=X&ei=2BxgVNeTL4GzyAT114DQAw&ved=0CBsQBSgA&dpr=1&biw=1280&bih=661#facrc=_&imgdii=j33zYJKetrRZNM%3A%3BQwlvLKBRQkbPMM%3Bj33zYJKetrRZNM%3A&imgrc=j33zYJKetrRZNM%253A%3Byv4vNEhfvEIQ1M%3Bhttp%253A%252F%252Fmobilehomefurnace.com%252Fzcart%252Fimages%252Fart150.bmp%3Bhttp%253A%252F%252Fmobilehomefurnace.com%252Fzcart%252Findex.php%253Fmain_page%253Dproduct_info%2526cPath%253D767_768_769%2526products_id%253D14583%3B1154%3B766
Intertherm does not offer a wiring diagram for the E1 series anymore. So I have included a link to the E2 series. They are very similar and you may find this service manual helpful for whatever problem you may be having.