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You can get the wiring diagram for free at http://thisoldtractor.com/mg_manuals/wiring_diagram_v7-iii-e4-stone.pdf
I believe I read somewhere that the GPS connector near headlight was on previous models to the III only.I have a pdf of the wiring diagram, but unable to attach to this post. I'll try to message you.
2. not on the III for some reason. I put in a 5 prong relay and run the GPS and radar detector off of it.
For V7 III - This from a user on the other forum. "Under the seat there is a spare plug which has switched 12v on it. It's there to accommodate an OEM Guzzi USB socket. Their USB socket price is extortionate. However, I'm using the plug to power my TomTom and an after-market USB socket. Will carefully secrete the wiring along the frame under the tank and mount both on my handlebars." There's a 15 amp fuse on the circuit - see number 5 in the diagram.
I hate to reply to an old topic, but since its related.....Does anybody know if I can buy just the wire connector end that mates to this USB socket connector? I hate to cut up wire harnesses and will be using this connector to power my GPS.
... and the V7 III's have it under the seat.
I took an educated guess on TE Connectivity AMP Superseal 1.5mm 2 Position Plug Housing, 282080-1it will be here by next weekend so I will let everyone know.
PS: If you buy a pre wired connector, test it first.plug it into bike and use test device (meter, test light) to see which led in your connector is Positive and which is Negative.Mine ended up being Red was negative and Black was positive :).Check First so you don't let the smoke out.