TM 9-2320-360-20-1 WARNING Jewelry can catch on equipment and cause injury or short across electrical circuit and cause severe burns or electrical shock.  Remove rings, bracelets, watches, necklaces, and any other jewelry before working around HET Tractor. WIRE NO. 1713 VOLTAGE TEST (1) Turn ENGINE switch to ON position. (2) Place ENGINE BRAKE RETARDER ON/OFF switch in the ON position. (3) Place positive (+) probe of multimeter on wire no 1713 at ENGINE BRAKE relay. (4) Place negative (-) probe of multimeter on ground and look for 10-14 volts on multimeter. (5) Place ENGINE BRAKE RETARDER ON/OFF switch in the OFF position. (6) Turn ENGINE switch to OFF position. WIRE NO. 1711 VOLTAGE TEST (1) Turn ENGINE switch to ON position. (2) Place positive (+) probe of multimeter on wire no 1711 at ENGINE BRAKE relay. (3) Place negative (-) probe of multimeter on ground and look for 10-14 volts on multimeter. (4) Turn ENGINE switch to OFF position. ENGINE BRAKE RELAY TEST NOTE Wire No 508 is for DDEC II vehicles, wire No. 988 is for DDEC III vehicles (1) Remove wire no 508/988 from ENGINE BRAKE relay. (2) Install jumper wire from terminal 85 on ENGINE BRAKE relay to known good ground. (3) Turn ENGINE switch to ON position. (4) Place ENGINE BRAKE RETARDER ON/OFF switch in the ON position. (5) Place positive (+) probe of multimeter on wire no 1716/1714 at ENGINE BRAKE relay. (6) Place negative (-) probe of multimeter on ground and look for 10-14 volts on multimeter. (7) Place ENGINE BRAKE RETARDER ON/OFF switch in the OFF position. (8) Turn ENGINE switch to OFF position. (9) Remove jumper wire from ENGINE BRAKE relay. (10)   Install wire no 508/988 on ENGINE BRAKE relay. Change 3  2-589