Hello,
I have Oxford heating grips and connected them directly to the battery of my XT660-R. Once I forgot them once till full drain which isn't nice. It's not possible to start it with zero battery
Looking further in the guide there is a fuse called " Backup fuse" (Immobilizer unit, meter assembly).
Did anybody tried to connect heating grips through this fuse ?
Thanks.

The "backup" fuse is not going to be any use to you as it is fed direct from the battery via the main fuse. It's there to power the immobiliser and keep the clock's time when the bike isn't running. In other words, it is a permanent live - not ignition switched.

You're best bet would be to wire up a relay to take a trigger feed from the supply to the brake light switch or tail light under the seat, then take the load for the grips direct from the battery via the relay and an in-line 5A fuse.

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That's what I did, splicing the rear tail light wire with a wire to excite the relay. And then as above, the main wire for grips direct from battery +ve via fuse you get with grips, through the relay. Even though they are supposed to have some 'smart' electronics now to switch off grips if voltage falls below certain level, the Oxford grips can still flatten your battery if left on!

May I ask why you use the rear light?


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It just so happens that the tail light wire is very easy to access and tap into under the seat to trigger a relay. It is right next to the battery as well, so the relay's the load can be taken from the battery positive easily and with a short run of wire. Also, being under the seat, its an obvious waterproof location for a relay.

The side/tail light circuit is only powered up when the ignition is on (or the key is in the "P" position), so provides an ideal switched supply. As the sidelight circuit runs pretty much all round the bike, you can tap into it just about anywhere that's convenient for whatever you're doing.

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Understood, that's Saturday's project lined up then


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