Learn Hardcore Arabic (Levantine): الكهربجي جاب سلك جديد وقال انو سلك الضو القديم لازم يتغير. - The electrician brought a new wire and said that the old light wire has to be changed.

It is a very common colloquial Levantine word for someone who works with electricity. The ending -جي is a common colloquial ending used for occupations or people associated with something.

كهربجي = electrician in everyday speech
كهربائي = more formal or closer to Standard Arabic

So الكهربجي sounds natural and spoken.

What verb is جاب from?

جاب is the past tense of يجيب, which means to bring.

So:

جاب = he brought
يجيب = he brings / will bring

In colloquial Arabic, جاب is extremely common and can also sometimes mean got or fetched, depending on context.

Why is it سلك جديد and not السلك الجديد?

Because سلك جديد means a new wire, not the new wire.

Arabic often uses an indefinite noun when introducing something for the first time.

سلك جديد = a new wire
السلك الجديد = the new wire

Here, the electrician brought a new wire, so the indefinite form is the natural choice.