TM 10-3930-653-14&P Test probe of a circuit tester (-) (+) Conduction terminal (+) plate 0 (+) plate terminal - terminal (-) plate - (-) plate terminal 0 (-) plate (+) plate 0 (+) plate (-) plate - Fig. 4-190.  Inspecting Diodes (4)   INSPECTION OF BRUSH Check the movement of the brush and if movement is unsmooth. check brush holder and clean it. Check the brush for wear. If It is worn  down  to  less than the specified limit. replace brush assembly. Check brush pig tail and, if found defective, replace. Fig. 4-191.  Brush Wear Limit (5)   SPRING PRESSURE TEST With  brush  projected  approximately  2  mm  (0.08  in) from brush holder, measure brush spring pressure by the use of a spring balance.  Normally,   the  rated  pressure of a new brush spring Is as follows. Spring pressure: 0.33 to 0.44 kg (0.73 to 0.97 lb) Moreover,  when  brush  is  worn,  pressure  decreases approximately 20 g (0.7 oz) per 1 mm (0.04 in) wear. Fig. 4-192.  Measuring Spring Pressure 4-7-5-5.  ASSEMBLY Reassemble  alternator  in  the  reverse  sequence  of disassembly noting following points. (1)   When  soldering  each    stator  coil  lead  .ire  to  diode assembly  terminal,  carry  out  the  operation  as   fast   as possible. (2)   When   installing   diode   in   the   "A"   terminal.   install insulating bushing and insulating tube correctly. Fig. 4-193.  Diode and A Terminal 4-108