I get a lot of messages asking about connecting USB/12v sockets to the AUX power feed on the CRF250 Rally so I’ve put together this quick article detailing what I’ve done so that others can do likewise.
Under the top left hand side fairing panel you will see a bundle of wires held in place by two soft metal bendable cable ties. In this bundle of wires there is actually a socket for connecting accessories to the 12v switched supply of the bike. The AUX power feed is protected by a 10A fuse under the seat so make sure you don’t connect anything that will draw more than 10A.
You don’t need to remove the plastics at all to access the socket, just release the wiring from the two flexible cable ties and lift it out onto the top edge.
When you first pull out the connector from behind the fairing it will have a dummy plug inserted into it, you will need to remove it and then reconnect your new plug once wired.
The plug can be sourced very cheaply from Eastern Beaver and can be connected to your accessory using nothing more than a set of crimps.
Make sure you order the 2 pin plug not the 4 pin plug!
Also, make sure you connect your accessory correctly checking the polarity of the feed before wiring as crossing POS and NEG will blow the fuse every time you switch on the bike!
I fitted a really nice little 2 x USB and 1 x 12v socket unit with a volt meter to my CRF250 Rally. It’s fairly water proof and hasn’t given me any problems so far. The other nice thing about this unit is that it has an illuminated on/off switch on the top so you can switch it off if your devices are fully charged.
The unit I fitted can be purchased on Ebay.
That’s it, hope this is of use to the people that have already pinged me asking for more info.
If you are fitting heated grips as I have, I wouldn’t recommend connecting them to the AUX power feed as they will push it to the limit current wise. It’s best to connect heated grips directly to the battery terminals and not via the wiring harness.