12Si Series Alternator Parts, Regulators, Rectifiers, Brush Holders

12si alternator

1983-1987

The 12Si series is largely consider to be an incremental improvement to Delco's previous 10Si series alternator. The bridge rectifier and cooling holes were enlarged, the fan was modified for better airflow, and there were improvements made to cooling overall. It also featured a thicker stator lamination stack for improved output at low RPM. Despite all these improvements, the maximum safe upgrade amperage for this unit is around 170 amps, but this is will shorten the life of the alternator considerably. If you want more than 140 amps in a durable unit, upgrade to our CS144 series alternator.

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Voltage Regulators

35-101-3 ..... 12 Volt, A-Circuit, 5-Amp Field, 14.7 Vset Standard Duty Regulator for Delco type 10Si, 12Si, 15Si, 17Si, 27Si/Type 100, 205 Series
35-101 ........12 Volt, A-Circuit, 5-Amp Field, 14.6 Vset Heavy Duty Regulator for Delco type 10Si, 12Si, 15Si, 17Si, 27Si/Type 100, 205 Series
35-101-1 .... 12 Volt, A-Circuit, 5-Amp Field, 14.7 Vset Self-Exciting Regulator for Delco type 10Si, 12Si, 15Si, 17Si, 27Si/Type 100, 205 Series IR/EF style Alternators
35-102-3 ..... 12 Volt, A-Circuit, 7-Amp Field, 14.4 Vset Standard-Duty Regulator for Delco type 12Si, 17Si Series
35-102-1 .... 12 Volt, A-Circuit, 7-Amp Field, 14.8 Vset Heavy-Duty Regulator for Delco type 12Si, 17Si Series
35-102-2 ..... 12 Volt, A-Circuit, 7-Amp Field, 14.8 Vset Self-Exciting Regulator for Delco type 12Si, 17Si Series s

Diode Trios

33-100 .... 3-amp diodes; 1-piece, slotted arm; Black case Standard Duty Diode Trio for Delco type 10Si, 12Si, 15Si, 17Si Series style Alternators
33-100-4 .. 3-amp diodes, LONG-LIFE, Standard Duty Diode Trio for Delco type 10Si, 12Si, 15Si, 17Si Series style Alternators
33-100-5 ... 3-amp diodes, LONG-LIFE, Heavy Duty Diode Trio for Delco type 10Si, 12Si, 15Si, 17Si Series style Alternators

Bridge Rectifier

31102 ...... 25 Amp/100 Volt diodes, SUPER-COOL Standard-Duty Rectifier for Delco type 12SI Series 56-78 Amp Alternators
DR5052 ... 50 Amp/200 Volt diodes, LONG-LIFE Heavy-Duty for Delco type 12SI Series 56-78 Amp Alternators
31-103 .... 50 Amp/200 Volt button diodes, SUPER-COOL Standard-Duty Rectifier for Delco type 12SI Series 94 Amp Alternators
DR5056 .. 70 Amp/100 Volt Jumbo button diodes, LONG-LIFE Heavy-Duty Rectifier for Delco type 12SI Series 94 Amp Alternators

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46-1100 . . 5MF Capacitor for Delco type 10DN Series ER/EF; 10Si, 27Si/Type 100, 29Si Series  Alternators

Brush Holder Assembly

39-101 .... Brush Holder Assembly for Delco type 10Si, 12Si, 27Si/Type 100 Series Alternators

Stators

271039 .. 78 Amp/12 Volt Stator for Delco type 12Si Series 56-78 Amp Alternators
27104 ... 94 Amp/12 Volt Stator for Delco type 12Si Series 94 Amp  Alternators

Pulleys - For a greater selection of Pulleys & Clutch Pulleys, click here

2411001 .. 1-Groove Pulley, 10mm Belt x 67mm OD x 17mm Bore for Delco type 10DN ER/EF; 10SI, 12SI, 15SI, 27SI/Type 100 Series Alternators
241101 ..... 2-Groove Pulley, 10mm Belt x 67mm OD x 17mm Bore for Delco type 10DN ER/EF; 10SI, 12SI, 15SI, 27SI/Type 100 Series Alternators
241102 ..... 2-Groove Pulley, 13mm Belt x 71mm OD x 17mm Bore for Delco type 10DN, 10SI Series IR/EF style Alternators
241103 .......1-Groove Pulley, 10mm Belt x 66mm OD x 17mm Bore for Delco type 10SI, 12SI, 15SI, 17SI, 27SI/Type 100, CS130, CS144  Alternators
241104 ..... 1-Groove Pulley, 13mm Belt x 81mm OD x 17mm Bore for Delco type 10SI/Type 116 Series Alternators
241105 ..... 1-Groove Pulley, 16mm Belt x 106mm OD x 17mm Bore for Delco type 10SI/Type 116 Series Alternators
241106 ..... 2-Groove Pulley, 16mm Belts x 111mm OD x 17mm Bore for Delco type 10SI/Type 116 Series Alternators
A202 ........ 1-Groove Pulley, 13mm Belt x 66mm OD x 17mm Bore w/ Keyway for Delco type 10SI Series Alternators for Agricultural, Industrial Applications
241250 .. 6-Groove Pulley, 21mm Belt x 62mm OD x 17mm Bore for Delco type 10SI, 12SI, 15SI, 17SI, CS130, CS144 Series Alternators
2412553.. 6-Groove Pulley, 21mm Belt x 56mm OD x 17mm Bore for Delco type 10SI, 12SI, 15SI, 17SI, 27SI, CS121, CS130, CS144 Alternators
241257 .. 5-Groove Pulley, 18mm Belt x 54mm OD x 17mm Bore for Delco type 10SI, 12SI, 17SI, 27SI, CS130, CS144 Series Alternators
24-1276.. 8-Groove Pulley, 28mm Belt x 62mm OD x 21mm Bore* (17mm Shaft) for Delco type 10SI, 15SI, CS130 Series  Alternators