bought a brodit car charger for my samsung and got round to fitting it ,but i cut the wires to have it on the 12v cig socket but for some reason i put it in the dock and it charges for literally 20 seconds and then stops but if i take it out and re connect it it does the same and charges for 20 sec s again then out .........

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does anyone know twhat the problem could be ??

 

thanks