magsafe 1 - repairing the cord

Hy everyone,

My issue is with the magsafe 1 from Mac. While clearing the cord suddenly broken and stopped completely to work.

The only correction at my point of view was changing the cord which a purchased over internet and upon arrival changed and for my bad surprise even changing with new one the charger is no longer working properly.

Connected to the power at the wall and plugged to the mac it lights up the brown or green light at the connector but shortly lights off and no charges to the battery is going on.

I even purchased another one, but not the original and it works, but the battery isn't charging 100%.

One or another clue would be helpful.

Thanks in advance.