hi have tried another battery which was 100 % , but no haven't actually checked the voltages , if it helps my tracker say battery is 12.6 volts when parked up

Hi am lost for ideas 1 reversing lights have stopped working 2 oil light/low screenwash/ seatbelt lights all come on together 80% of the time (sometimes all stay out for couple of days) have put it on my icarsoft diagnotics with no joy apart from nsf height sensor fault have also tried...