Thanks for the wiring diagram - I've now got a copy printed out and stored under the seat in case of future need.
Anyway, turns out it was the battery - it was the symptoms being so similar to the old one that made me suspect the bike.
I hooked up the battery from my Z1300 and even though that was a bit low, it still started the GTR with no problems so I knew the wiring and connections were all fine.
To confirm, I connected the suspect battery up to a spare headlight and voltmeter to see how it fared. It immediately dropped to 12.5V as would be expected for a 5A load, but it carried on slowly dropping until after about ten seconds it rapidly collapsed to below 10V.
A new battery I fitted and checked a week ago has just started it fine this afternoon so I'm happy a happy bunny again now.
Just a shame I'll have to wait several weeks until I'm back on the the Isle of Man before I can return the duff one for a refund!
Anyway, turns out it was the battery - it was the symptoms being so similar to the old one that made me suspect the bike.
I hooked up the battery from my Z1300 and even though that was a bit low, it still started the GTR with no problems so I knew the wiring and connections were all fine.
To confirm, I connected the suspect battery up to a spare headlight and voltmeter to see how it fared. It immediately dropped to 12.5V as would be expected for a 5A load, but it carried on slowly dropping until after about ten seconds it rapidly collapsed to below 10V.
A new battery I fitted and checked a week ago has just started it fine this afternoon so I'm happy a happy bunny again now.
Just a shame I'll have to wait several weeks until I'm back on the the Isle of Man before I can return the duff one for a refund!