14:th-May-2015, 12:58:28
Further update (unable to edit first post)
Purchasing of that adapter didn't help until I looked into it further.
I bought a 5M lead originally and that apparently is too long to charge the phone even with the adapter. I then took the plunge again and purchased this 3M Charge only lead and then installed.
This has solved the issue and my phone now fully charges. I also moved the adapter I bought originally across to the dashcam as I had noticed the battery on that had also started to go down and now it is fully charging.
Basically these car adapters only charge in USB mode unless you buy a cable that shorts the data pins together.
Anyway hope it helps someone in the future.
Purchasing of that adapter didn't help until I looked into it further.
I bought a 5M lead originally and that apparently is too long to charge the phone even with the adapter. I then took the plunge again and purchased this 3M Charge only lead and then installed.
This has solved the issue and my phone now fully charges. I also moved the adapter I bought originally across to the dashcam as I had noticed the battery on that had also started to go down and now it is fully charging.
Basically these car adapters only charge in USB mode unless you buy a cable that shorts the data pins together.
Anyway hope it helps someone in the future.

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