XBR ignition key switch

[mthee]

Having googled, scratched my head and slept on it several times, I realise my lack of electrical knowledge means I'm in need of your help (again!) Can anyone tell me the maximum load that is switched by the ignition key? Many thanks.

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[iansoady]

Without a wiring diagram it's impossible to say - eg what are bat 1 and bat 2?

[mthee]

Sorry, tracing the wires, this is what I got;

Bat 1 is +ve feed off battery.
Bat 2 is Reg/Rectifier
PA is Side stand (this is off a diagram for GB500, which mine is not..! So not sure here)
IG is CDI
E is ground
TL1 is tailight
TL2 is Tacho and Speedo lights

[iansoady]

Then it looks as though the full generator output goes through Bat1 - Bat2. Not a very sensible design as this could easily be 20 amps or so.......

You could rewire it to use a relay to switch that connection as the other connections (sidelights, CDI etc) will be quite low current.

[mthee]

Thanks. If it looks like poor design, maybe I've made a mistake in tracing the wires. I'll double check.

[mthee]

I see R/Bl going to the fuse box and becoming Bl before connecting the reg/rec?

So max load is 20A?

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[iansoady]

Yes, looks like that feeds the positive bus in the fusebox.

You could put a relay in there - with a direct fused battery feed to the fusebox (on the brown) cable with the switched contacts in in it, triggered by the red/black coming from the ignition switch.

[mthee]

Thanks for setting me straight on this, Ian.

[mthee]

Then it looks as though the full generator output goes through Bat1 - Bat2. Not a very sensible design as this could easily be 20 amps or so.....

Would you explain why this is a poor design for me? I'm trying to improve my knowledge of electrics.

[iansoady]

You would normally not route a high current through a switch like an ignition switch as the contacts usually aren't very robust. It's fine for controlling a relay etc or indeed feeding the ignition.

[mthee]

Worth looking after, too, as I couldn't find a replacement for mine. I shall get the graphite powder out, make sure I service the contacts and then add your relay. Much appreciated!

[Moto63]

Afternoon Matt, I think I've still got an xbr ignition switch in my stash somewhere, probably a tad worn from memory but if you want/need it let me know and it's yours for the price of the postage 👍
Cheers, Michael

[mthee]

Cheers, Michael!

[Moto63]

Just away for the Easter weekend, back Monday evening Matt. I'll double check I've still got the switch upon my return and let you know 👍🔑

[mthee]

I'd like to try to clean mine up first, but it's great to know I can relax if it's not serviceable. Ta very much!