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6G. 110 amp. Side mount. White/ Blue volt. reg. Most pulleys 2 1/2″ OD. $105.00                         $50.00 core

6G. 110 amp. Avalanche Diodes. White/ orange volt. reg. updates to BLACK. Most pulleys 2 1/2 ” OD. $109.00                      $60.00 core

6G. 135 amp. Large frame. White/ orange volt.reg. Updates to BLACK . Clutch pulley. $129.00                          $60.00 core

4G. 130 amp. Black metal cover on back. White/ Blue volt. reg. Use F797HD only. VIN S. Most pulleys 2 3/4 ” OD $109.00                              $60.00 core

6G. 110 amp. Side mount. White/ Blue volt.reg. Most pulleys 2 1/2 ” OD. $105.00        $40.00 core   A=139r, 182n, 108g, 141g  Z=134r, 180n, 104g, 140g  O=119r, 139n, 92g, 108g (4-15)

3G. 95 amp. 4 holes between webs signifies small frame. Same as Q77-50. Most pulleys 2 1/2″ OD. $75.00                             $30.00 core

6G. 105 amp. Small frame. Gray volt.reg. updates to Gray/ Green.  Most pulleys 2 1/4 ” OD. $109.00                $50.00 core

4G. 130 amp. Black metal back. Gray volt. reg. Most pulleys 2 3/4 ” OD. 8 groove pulley. Mostly diesel applications. $99.00                      $45.00 core

6G. 105 amp. Double straddle mount. White/ Orange volt. reg. updates to BLACK.  Most pulleys 2 1/2 ” OD. $105.00                   $50.00 core

3G. 130 amp. 2 holes signifies hi amp large frame. Gray volt. reg. 5 groove pulley. 2 1/2″ OD. $79.00                       $30.00 core