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Page Title: ADJUSTMENT
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TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL The voltage regulator used in these alternators is a solid state device and for this reason will normally have an extremely long   life.      It   can,   however,   be,   damaged   by   mechanical   or electrical abuse. If    the    system    polarity    is    inadvertently    reversed    by installing  a  battery  backwards,  boosting  or  jump  starting  with the jumper connected backwards, or reversing the positive and negative  alternator  output  leads  when  changing  an  alternator, the  voltage  regulator  will  be  damaged.  Although  the  polarity reversal   may   only   be   momentary   and   may   not   damage   the alternator diodes, the regulator will still be damaged. ADJUSTMENT Prior to adjusting alternator voltage, the wiring, connections and belt tension should be checked and repaired as needed.    The  batteries  should  be  fully  charged  and  the  engine should be running at a fast idle.  Turn off all vehicle loads such as lights, radios, heaters.  air conditioners, etc.  when checking or    adjusting    voltage.        An    accurate    voltmeter    should    be connected    across    the    batteries    to    determine    the    charging voltage.    Do  not  rely  on  dash  mounted  vehicle  instruments. These   are   excellent   indicators   but   usually   lack   the   extreme accuracy   required   for   regulator   adjustment.      Remove   nylon screw  (plug)  from  the  regulator  (see  Fig.  1),  and  with  a  small screwdriver carefully turn the adjusting screw clockwise to raise or  counter-clockwise  to  lower  the  voltage.    The  ideal  voltage setting  will  be  a  value  which  maintains  a  fully  charged  battery without resulting ill all excessive usage of battery water. When   turning   the   voltage   adjustment   screw,   do   not attempt to force it past its stop as damage will result.  Be sure to  replace  the  screw  (plug)  in  the  regulator  adjustment  hole  to prevent the entrance of water and dirt. DISASSEMBLY 1. Remove pulley nut, pulley, fan, key and spacer.  Use a suitable   puller   to   avoid   damage   to   the   shaft   and threads. 2. Remove four screws and carefully lift regulator free of housing.  Remove red and black leads from regulator, noting  their  position  to  facilitate  reassembly  (see  Fig. 4). 3. Remove  lead  from  diode  trio  to  terminal  on  regulator housing.      Loosen   inner   nut,   which   will   allow   blue regulator   lead   to   be   withdrawn   from   under   head   of terminal screw. Remove regulator (see Fig.  4). 4. Lift  brush  and  spring  assemblies  out  of  housing  (see Fig.  4). 5. Remove   three   nuts   and   lift   diode   trio   off   of   A/C terminal studs (see Fig.  5). 6. Remove three self locking nuts and through bolts. 7. Remove  rotor  and  drive  end  housing  assembly  from stator and slip ring end housing assembly.  If drive end housing  binds  on  stator,  loosen  by  tapping  gently  on mounting  ear  with  fibre  hammer.    Be  sure  that  drive end   housing   separates   from   stator   and   that   stator remains   attached   to   slip   ring   end   housing   to   avoid damage to stator leads (see Fig.  6). CTS-2743T  Page 5 PRINTED IN UNITED STATES OF AMERICA

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