Voltage output from 350LM charging cable

Orinoco

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I've fitted a new cradle and power cable to my bike, but cannot get the Garmin to charge from the battery.

Zero voltage measuring between the pins, but 6.4v from both pins if using an earth on the bike! Which is weird as I'd assumed power should be @ 5v from positive and 0v from negative.

Cable is wired direct to battery using supplied Garmin cable/unit, positive fused and connected to an Optimate connector (doubles up as trickle charger connection).

Any thoughts?

Thanks
 
A belated update, it was a dodgy cable/control box, rang Garmin who've replaced in FOC, all good now
 


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