Kissi bhi cheez ki wiring ki 2 wire hoti hain one positive and one negative.
Positive battery se power laati hai
Negative kissi bare metal part k sath connect kartay hain also called ground. Gaari mein multiple wires different areas pe ground hui wi hoti hai aap battery kay negative terminal ko follow karain woh bhi kahin engine bay mein metal piece k sath connected hoga issay ground kehtay hain.
it makes a complete flow.
90% of the time jab dashboard pe sab lights on ho jain like a Christmas tree ground ka issue hota hai jahan ground ki wa ho woh wire lose ho ya us area pe rust a gaye etc etc
baki yeh weird si problem have i have never heard of it before