Delco-Remy Alternators

These units feature a solid state regulator mounted inside the alternator slip ring end frame along with the brush holder assembly. All regulator components are enclosed in a solid mold with no need or provision for adjustment of the regulator. A rectifier bridge, containing six diodes and connected to the stator windings, changes A.C. voltage to D.C. voltage which is available at the output terminal. Generator field current is supplied through a diode trio which is also connected to the stator windings. The diodes and rectifiers are protected by a capacitor which is also mounted in the end frame. Some units incorporate a resistor in the warning indicator circuit.
Some alternators used on diesel engines are equipped with an R terminal for the tachometer. On these units, if the alternator pulley is to be replaced, a pulley of the same diameter as the one removed must be installed, or tachometer may provide inaccurate readings.
No maintenance or adjustments of any kind are required on this unit.

Fig. 1 Delcotron type 10 SI alternator:

Fig. 2 Cross sectional view of 12 SI alternator:

Fig. 3 Delcotron type 15 SI alternator:

Fig. 4 Delcotron type 17 SI alternator:

Fig. 5 Delcotron type 27 SI alternator:

Fig. 6 Wiring diagram of charging circuit: