i recently installed a new radio (without a harness) (spliced) and now my door bells, windshield wipers, power windows & speedometer lights wont work.. i have a couple theory's first is theres extra wires from the cars original harness that have nothing to plug into
black & white
second the extra wires were just taped up do they need to be grounded?
2002 pontiac aztek
please help me figure this out