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. ENGINE BRAKE RETARDER WIRING HARNESS TEST (1) Remove wire no 1715 from connector on right cylinder head. (2) Set multimeter to ohms position. (3) Connect multimeter leads to connector terminal and known good ground. (4) Observe resistance reading displayed on multimeter. (5) Remove multimeter leads from terminal and ground. (6) Install wire no 1715 on connector at right cylinder head. WIRE NO. 1716 VOLTAGE TEST (1) Remove wire no 1716 from connector on left cylinder head. (2) Remove wire no 508/988 from ENGINE BRAKE relay. (3) Install jumper wire from terminal 85 on ENGINE BRAKE relay to known good ground. (4) Turn ENGINE switch to ON position. (5) Place ENGINE BRAKE RETARDER ON/OFF switch in the ON position. (6) Place positive (+) probe of multimeter on wire no 1716 at left cylinder head. (7) Place negative (-) probe of multimeter on ground and look for 10-14 volts on multimeter. (8) Place ENGINE BRAKE RETARDER ON/OFF switch in the OFF position. (9) Turn ENGINE switch to OFF position. (10)   Remove jumper wire from ENGINE BRAKE relay. (11)   Install wire no 508/988 on ENGINE BRAKE relay. (12)   lnstall wire no 1716 on connector at left cylinder head. ENGINE BRAKE RETARDER WIRING HARNESS TEST (1) Remove wire no 1715 from connector on right cylinder head. (2) Set multimeter to ohms position. (3) Connect multimeter leads to connector terminal and known good ground. (4) Observe resistance reading displayed on multimeter. (5) Remove multimeter leads from terminal and ground. (6) Install wire no 1715 on connector at right cylinder head. Change 3  2-593