Have you had a look at the fuses? Fuse number 1 specifically, which supplies the sidelight and indicator circuits. Do your sidelights still operate?

It could be your accessory socket, especially if it's hooked into the sidelight circuit and wasn't protected by it's own fuse with a <10A rating. Or it might be that the heated grips, plus whatever you plugged in, together with the sidelights totalled more than 10A and fuse 1 blew?

Where did you connect the accessory socket? To the spare connector behind the dash perhaps? What did you plug into it? What circuit are your grips wired into and are they protected by a 3.5A/5A fuse?

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