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rhunt12312 
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Joined: 08 Aug 2018
Location: North Carolina
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 Topic: 1976 720 - Red Wire Caught fire ?
Posted: 08 Aug 2018 at 4:59pm |
Hello all
Recently picked up my late grandfathers 720S that he dearly loved and I am proud to keep in the family and working.
Runs well cut grass 2x and on the 3rd time cutting engine quite and then a red wire that was connected to just the right side of the medal frame near the snow thrower PTO caught fire and broke off. I checked gas amount and after a few minutes it started and I put back in the garage.
Gas cap may need replacing as I investigate the venting issue last night but wonder what that wire is and why it burnt up. It goes and connects to a electronic board up near the inside ignition switch.
14 HP Kohler Engine
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AC720Man
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Joined: 10 Oct 2016
Location: Shenandoah, Va
Points: 4963
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Posted: 08 Aug 2018 at 9:09pm |
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Hot wire must have rubbed the frame and grounded out. That’s my guess. Frame will be black from the spark where it made contact.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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AC720Man
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Location: Shenandoah, Va
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Posted: 08 Aug 2018 at 9:12pm |
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Would have to see a wiring diagram to see what it goes to.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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rhunt12312
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Location: North Carolina
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Posted: 09 Aug 2018 at 8:27am |
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Thanks for comments guys. Wire looks like it was attached to frame with black tape. Anyone know where I could find the wiring diagram? I have original Owners Manual but not in there.
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AC720Man
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Posted: 09 Aug 2018 at 11:08am |
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Must not be the 720 that I have, it's has the Onan 19.5 hp engine. I could have helped ya if it was.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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rhunt12312
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Location: North Carolina
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Posted: 12 Aug 2018 at 11:26am |
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OK my bad bigtime. It is a 712H not the 720. I think the wire was ground wire. replaced it and secured to frame as a ground. Started, ran for few secounds and cut off with the smell of burning electrical. Now will not even produce any sound of trying to start. What did I blow and how to diagnose? Also a wire diagram showing where it goes to the tractor would be nice. Anyone know were to download?
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Steve in NJ
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Joined: 12 Sep 2009
Location: Andover, NJ
Points: 11852
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Posted: 23 Aug 2018 at 6:24am |
I'm surprised you can't find a wiring diagram on the internet. The wiring in a 716H is basically the same wiring if you don't find a 712H diagram. I'll havta' look in my wiring diagrams at the shop. I can to tell you what the red wire is and where it goes. I offer a harness for the 700 series GT's. If it was a 720, the red wire in the engine area is the oil pressure circuit on the Onan engine...
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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