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Yamaha XS400 Wiring Diagrams

Discussion in 'The Garage' started by Travis, Nov 17, 2010.

  1. Bury Me In Smoke

    Bury Me In Smoke Try not. Do... or do not. There is no try.

    B4464228-B3EC-48FC-9431-9B03401FFC3E.jpeg 697BD6C4-2F5E-4623-97B5-BBF3D0472FE4.jpeg
    To compliment my last post, here are the wire colors from the ignitor unit. As you can see, there are no solid black, solid gray, or solid orange wires here. For my application I’m going to try to match the wiring colors to those coming out of the ignitor unit since this will be a point of reference for future troubleshooting. The diagram shows solid brown, solid white, and solid green wires as an intermediary harness. I think that’s an opportunity to improve and save myself future frustration.
  2. anthony nunes

    anthony nunes XS400 Member

    Is that your plug coming from a rectifier is there a way to test those rectifiers I’m having a charging problem now with my 1980 XS400
  3. Bury Me In Smoke

    Bury Me In Smoke Try not. Do... or do not. There is no try.

    It’s the plug for the ignitor unit. It’s the brains of the ignition system.
  4. Liamthedevastator

    Liamthedevastator It's dingaling'n time

    Going to contribute to this thread with a ledger sized and coloured 1977 XS400D Wiring Diagram.

    Attached Files:

  5. Dav-len

    Dav-len XS400 Member

    Hi all
    I am looking for xs400 1980 wire diagram.
    The 1981 says there is a head light relay.
    Yet mine does not seem to have one. I’m confused. Can any one assist?
  6. xschris

    xschris XS400 Guru Top Contributor

    80 models has them at the front of the bike next to the neck under the gas tank.
  7. Dav-len

    Dav-len XS400 Member

    That means some one took mine out and rewired the bike, talk about a pain lol. No worries will sort her out thank you for the information. I will be adding photos soon as I start assembling her.
  8. dannyTheBoat

    dannyTheBoat XS400 Enthusiast

    This is a simplified wiring diagram the PO gave me with the bike. I verified it when I had to do work on the fuses. It says its for an '81 xs650 but it works with my '82 xs400 as well, granted the only stock electronics left on my xs is the ignition module. Just the bare bones basics. I've had the bike for close to 3 months now and I've put probably about 300 miles on it with no electrical problems except the occasional battery drain when left sitting. This might be a good resource for someone doing a compete rebuild and wants a basic circuit to get the bike on the road, or something along those lines.
  9. In my quest to build my own wiring harness from scratch for my '78, I decided to translate the awesome ones on the German XS400.net site. I'll post the translated versions here if it's ok. Hopefully they will help anyone looking to do this. I also modified the one to include the three position light on/off/hi/lo switch included in on of the addendum's to the original drawings. Minimal_Schematic_up_to_1978_V1.2.jpg Minimal_Schematic_up_to_1978_V1.2 with 3 position light switch.jpg
    BBS360 likes this.
  10. Ernestoman

    Ernestoman XS400 New Member

    Haven't seen much on the 1981 XS400H wiring diagram. Is it the same as the XS400SH? Trying to rewire this thing but I have no idea where to start

    Edit: After a little digging, I found a thread on another site saying "The XS400 H (Special 2), SH & SJ (Heritage) US models share the same harness", so I'm guessing the wiring diagrams are probably the same
    Last edited: Sep 23, 2022
  11. CaptChrome

    CaptChrome XS400 Addict

    @Ernestoman, yes, the H and SH have the same wiring. The diagram for the bikes are part of the factory service manual available for download at the top of this forum.
  12. Ernestoman

    Ernestoman XS400 New Member

    $20 well spent on ebay

    Attached Files:

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