Cm400 Wiring Diagram Cm400 Wiring Diagram. Author Topic: CM wiring harness help (Read times) am looking at this wiring diagram correctly just seem to be lights for my gauges. Anyone out there have a diagram i can get off them. Just obtained a CMT off a friend. Going of course for a bob look, simple running. These are simplified wiring diagrams for Honda CB and 1981 Honda CM400 CM CB 400 Wiring Harness Loom | eBay Here is the wiring harness taken from a 1981 Honda CM400 E. It is in good used condition and ready to install. We may not have all the answers that you are looking for, but we will try to help. For example seats, windshields, front forks, etc.Seller Rating: 100.0% positiveLocation: Grundy Center, IowaShipping: Free 1980 CM400T Low/High Beam Wiring Question | Motorcycle Forum Jul 21, 2011I literally just got done going through my wire harness. The headlight wasn't working/ I thought there was a break in the line and was freaking out because thats a lot of work. My father was an electrical engineer and gets off on that kind of stuff so he helped me out. There was a connection problem within the high/low switch. cm400 wire harness | eBay 71 results for cm400 wire harness Save cm400 wire harness to get e-mail alerts and updates on your eBay Feed. Unfollow cm400 wire harness to stop getting updates on your eBay Feed.