Hello I bought a new big starter cable for our TDI last year. Had to use it today for the first time and it didn’t work. Thought the starter at the breakdown car was broken. Didn’t think the nail new cable would be broken. I then recharged the battery and half day later he jumped on super. Now I came up with the idea if the cable does what it should. It is this cablehttp://www.aeg-automotive.com/en/produkte/id/169 He has extra Startpro tect. There is such an LED in it that is red. But whether that means the juice is on it or if what is wrong I don’t know. Can I test such a cable except for pure passage?