Alarm Wiring

Hello All,

just thought i’d ask incase someone here can help. fitting a SPY alarm to my CBR900RR (2001) and just wanted to establish how i can tell which wire is the “live” one?

I’ve got a black and white wire that looks like it comes from where the fuse is plugged in, and a thicker red and black wire…

can anyone point me in the right direction…?



A multimeter will be your best friend. Check for continuity between the fuse and each of the wires. The wire having continuity with the fuse will be the +12v

Also get some woliring diagrams. Haynes manual is your friend here. I fitted an aftermarket speedo using a haynes manual and plenty of patience.

Those pesky woliring diagrams… or indeed wiring diagrams

Black is usually the earth wire.