When you're replacing light switch, FSN 5930-307-8856, on tactical and combat vehicles, be sure to tighten the cable plug nut. A final, good twist by hand ought to be enough to keep it from vibrating loose and causing arcing between the plug and switch contacts. The spanner wrench in the Automotive Mechanic's Tool Kit also works on the plug, but you have to be careful behind the dash with it, what with all the wiring for the different switches. It also pays to remove the battery ground cable. YOUR M49A2C TAK TRUCK... FILTER BY THE NUMBERS Refueling of aircraft is getting' better 'n better less chance of water or other foreign stuff foulin' up the bird's works now that the M49A2C 2/2-ton tank truck is on the scene. ELEMENT 1.iS t S CANIH 4 FUSE A new water separator-filter system, with go-no-go fuses, is among features of the M49A2C. You get all the dope in Ch 1 (May 65) to TM 9-2320-209-10 and Ch 1 (Jun 65) and Ch 2 (Dec 65) to TM 9-2320-209-20. FSN's for the filter elements and go-no-go fuses will be in the newest TM 9-2320-209-20P. They're already in Ch 2 (May 66) to TM 9-2300-223-20P as Element fuel filter, FSN 4330-983-0998, and Fuse Assembly, fuel filter, FSN 5920-903-0527. 47