Have you tested the battery itself? Try charging it at a low current (0.75A is recommended) then let it sit for half an hour and then check voltage. Let us know what the voltage is. Bad batteries are often the cause of problems with the GZ, so lets get that out of the way first. BTW, don't ever use a car battery charger. The current is way too high, and will fry your bike battery. A bike charger is usuallycheap. Mine cost €15 (less than $20)
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By birth an Englishman, by the grace of God a Yorkshireman.
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