TM 9-6115-658-13&P 5-20 5-13  RESISTOR MAINTENANCE.   This task covers: a. Test   c.     Installation b. Removal INITIAL SETUP Tools      Equipment Conditions Tool Kit, General Mechanic's   Reference (item 1, Appendix B) Multimeter Both generator sets shut down; paragraph 2-5.3.3. Soldering Gun Trailer handbrakes set, front support leg/landing lowered, and rear leveling-support jack lowered; Materials/Parts   paragraph 2-3.2.1.  Switch box cover open. Lock washers Solder TEST NOTE If testing R1 or R2, step 1 must be performed. 1. Remove four screws (1, Figure 5-10), lock washers (2), and flat washers (3) and invert relay board assembly   (4). 2. Measure resistance of R1 (5) or R2 (6) for 246.5-251.5 ohms.  If resistance is out of tolerance, replace resistor.   3. Measure resistance of R3 (11) for 246.5-251.5 ohms.  If resistance is out of tolerance, replace resistor.   4. If resistors R1 and R2 are within tolerance, place relay board assembly in position and secure with flat washers (3), lock washers (2), and screws (1). REMOVAL NOTE If removing R1 or R2, step 1 must be performed.   1. Remove four screws (1), lock washers (2), and flat washers (3) and invert relay board assembly (4).   2. Tag and unsolder leads from resistor.   3. Remove two nuts (9), lock washers (8), flat washers (7), screws (10), and resistor (5, 6, or 11).