4 point harnesses and the no seatbelt light?

If I put harnesses in my car, won't the no seatbelt light come on everytime?

if you don't have your seatbelt on it will. Unless your harness is properly secured it's more of a death trap than a restraint.

Well why would I keep the stock seatbelt if I have 4 or 5 point harnesses?

just find a way to complete the circuit for the seatbelt system, so just like take apart to stock seatbelt buckle thing and find where there is a way to do that

Well why would I keep the stock seatbelt if I have 4 or 5 point harnesses?
why would you need a harness if your car isn't a complete drag or road race car?

With out a cross bar for the belts to go over, the belts can be a "death trap" as said above. If There is no contact point on the belts higher then your shoulders, they will be holding you down, not back, which in a collision, could crush your spine rather then hold you in place. I read that in a Super Street i belive.