Yanmar 3YM30 wiring loom

[KAM]

During winterisation checks I noticed some chafe on the wiring loom between the alternator and starter. I can see the bare end of a large diameter red wire sticking out of the chafed spiral plastic cable cover. The main alternator wire is connected and intact. Everything is running and charging normally. I can't detect any volts on the wire. No sign of anything in the wiring diagram. Anybody know what the purpose of this might be before I start investigating. Twin alternator wiring possibly? I have had the engine from new so its not been modified in any way.

 

[earlybird]

Have you got some form of split charge arrangement? This could require the standard wiring to the alternator output to be modified by the installer.

 

[RichardS]

If there is no voltage between the wire and ground when the engine is running and everything works properly it clearly isn't being used. I would just tape over it and try to fix it so it doesn't chafe any more.

Richard

 

[KAM]

Thanks earlybird you've just triggered a distant memory. I fitted an adverc when I put the engine in 10 years ago. I ran the alternator wire straight to the split charge diode. I think the original wire went through the loom to the starter solenoid which I must have just cut back. Just marking up the wiring diagram now so I remember in another 10 years. Just wondering how many other "seemed simple at the time" mods I did without documenting them.