Timothy Kelly
check_kelly
I bought a non-running ‘81 XS400 last year and I’m in the process of getting it running.
The build started out as a budget job, replacing a few things that needed replacing (battery, fuel line, rear tyre) and getting it on the road. Eventually, I accepted that I was going to be revamping and customizing the whole bike.
I knew I wanted to use an M-unit Blue in the build, mainly for its ease of useand accessibility. Re-wiring doesn’t bother me too much, but my understanding of electrical theory is limited.
Has anyone re-wired an XS with an M-unit Blue? It has an Ignition Output wire that I’m not sure how to incorporate into my wiring loom.
There are two wires coming from the starter solenoid, a blue and white (L/W) and a red and white (R/W). The L/W goes to the Start Output on the M-unit. I assume the R/W is switched power as the wiring diagram shows it being connected to the R/W going from the Igniter to the coils (when I originally had them connected the engine would turn over when I pressed the starter). Since the Ignition Output is supposed to provide the switched power I chose to replace the R/W from the starter with it. I spliced it into the power wire (Red/White) that runs from the igniter unit to the ignition coils. However, when I press the Starter button nothing happens.
Apart from the wiring, everything else has gone relatively smoothly. Any help or advice is appreciated. I’m posting a photo of the current wiring situation and the XS models wiring diagram.
The build started out as a budget job, replacing a few things that needed replacing (battery, fuel line, rear tyre) and getting it on the road. Eventually, I accepted that I was going to be revamping and customizing the whole bike.
I knew I wanted to use an M-unit Blue in the build, mainly for its ease of useand accessibility. Re-wiring doesn’t bother me too much, but my understanding of electrical theory is limited.
Has anyone re-wired an XS with an M-unit Blue? It has an Ignition Output wire that I’m not sure how to incorporate into my wiring loom.
There are two wires coming from the starter solenoid, a blue and white (L/W) and a red and white (R/W). The L/W goes to the Start Output on the M-unit. I assume the R/W is switched power as the wiring diagram shows it being connected to the R/W going from the Igniter to the coils (when I originally had them connected the engine would turn over when I pressed the starter). Since the Ignition Output is supposed to provide the switched power I chose to replace the R/W from the starter with it. I spliced it into the power wire (Red/White) that runs from the igniter unit to the ignition coils. However, when I press the Starter button nothing happens.
Apart from the wiring, everything else has gone relatively smoothly. Any help or advice is appreciated. I’m posting a photo of the current wiring situation and the XS models wiring diagram.
