HEAVY DUTY ALTERNATORS IDENTIFICATION CHART IH IDENTIFICATION MFGR’S.  NO. RATING REGULATOR CODE PART NUMBER PART NUMBER 08141 585945C91 2312JB 65 Amp 08142 585946C91 2512JB 90 Amp 08143 585947C91 2612JB 105 Amp 585949-C1 08158 585948C91 2812JB 145 Amp 08172 547269C91 2912JB 160 Amp DESCRIPTION The IH heavy duty alternators (Figure 1) are 14 volt self load   limiting   alternators   which   feature   a   built-in   solid- state voltage regulator. Figure 1 - Alternator Assembly. Alternators   built   through   late   1983   are   equipped   with adjustable voltage regulators. Alternators  built  more  recently  are  equipped  with  “fixed voltage"  regulators  which  cannot  be  adjusted.    These regulators  are  identified  by  the  absence  of  the  plastic screw  that  was  used  to   plug   the   voltage   adjustment access hole (Figure 2). Adjustable and non-adjustable regulators are interchangeable and have the same part number.  Only the non-adjustable type will be provided for service after stock of the adjustable type is depleted. The alternators incorporate a 7/8" straight shaft, a large ball bearing at the drive end and a  roller  bearing  at  the slip  ring  end.    The  alternators  have  a  two  leg  swivel mounting, one leg of which is equipped with a slideable bushing. Figure 2 - Voltage Regulators. Six    silicon    diodes    mounted    in    heat    sinks    convert alternating current from the delta wound stator into direct current.  A capacitor connected between the heat sinks assists  in  suppressing  transient  voltage  spikes   which could possibly injure the diodes. The   brushes   and   voltage   regulator   are   located   in   a waterproof housing and may be removed for replacement or inspection without dismantling the entire machine. OPERATION Current is produced by rotating a magnet called  a  rotor inside a stationary winding called a stator. CTS-4043A - Chapter II - Page 2