PLACE THE SWEET AND HOT SAUSAGES, GREEN AND RED PEPPERS, ONION, AND PASTA SAUCE IN A SLOW COOKER. ADD ABOUT 1/2 A JAR OF WATER. COOK ON LOW FOR 6 TO 8 HOURS, OR ON HIGH FOR 3 TO 4 HOURS.
FILL A LARGE POT WITH LIGHTLY SALTED WATER AND BRING TO A ROLLING BOIL OVER HIGH HEAT. ONCE THE WATER IS BOILING, STIR IN THE MACARONI, AND RETURN TO A BOIL. COOK THE PASTA UNCOVERED, STIRRING OCCASIONALLY, UNTIL COOKED THROUGH BUT STILL FIRM, ABOUT 8 MINUTES. DRAIN WELL.
SLICE THE COOKED SAUSAGES, THEN RETURN TO THE SLOW COOKER. ALLOW TO REST FOR 10 MINUTES BEFORE SERVING THE SAUSAGE, PEPPERS, AND ONION OVER THE MACARONI.