Ford ES — TESTING ROTATING RECTIFIERS

For the Ford ES.

Procedure

Disconnect all leads from-assembly to be tested.
Connect one test lead to F1+ stud and connect
Connect one lead to F2- stud and connect other
Reverse ohmmeter leads from steps 2 and 3 and
All the resistance readings should be high in one
Replace defective rectifier assembly with new,
Using high scale on ohmmeter, connect ohmme-
Connect one ohmmeter lead to each end of diode
Reverse ohmmeter leads and again observe re-
Replace defective diodes with new, identical
Wires 1-2 and 3-4 are wound on thesame iron core.

Specs & torque values

accurate ohmmeter, test each CR using negative and
4. Reverse ohmmeter leads from steps 2 and 3 and
Use 24 Ibs-in. (2.7 Nmm) torque when tightening nuts on F1+ and
OHMMETER
1. Using high scale on ohmmeter, connect ohmme-
should be one megohm or greater. Reverse ohm-
should again be one megohm or greater.
printed circuit board. Using an accurate ohmmeter,
1. Connect one ohmmeter lead to each end of diode
2. Reverse ohmmeter leads and again observe re-
OHMMETER
Using a 6 volt dry cell battery and a 200 ohm
nect a DC voltmeter across the 200 ohm resistor.
0.39 ohms and 0.38 to 0.46 ohms respectively at 77" F
ohms, between Xl-X2 133 to 163 ohms at 77OF
between field leads should be 10.98 to 13.42 ohms at
OHMMETER RESISTANCE BETWEEN
10.98 TO 13.42 OHMS
Connect ohmmeter between either field lead and
exciter stator laminations. Use ohmmeter set at
R x 100 scale. An ohmmeter reading of less than
OHMMETER

Source: manual:0900-0335_Service Manual Ford Engine Detector I1_198207.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.