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26-SI ALTERNATOR
1G/287 4/96
PAGE
FIELD COIL
3. Disconnect 2 field leads from regulator (9) by removing
2 insulated regulator attachment screws (36). (See Fig.
12) Use ohmmeter to check resistance of field coil.
Compare to Field Check ohms in Specifications at the
end of this manual or from Service Specification
Bulletin. If outside specifications, replace field coil as
described later in this section.
REGULATOR
4. IMPORTANT
Back (metal side) of regulator and both sides of regulator
mounting plate are coated with silicone heat transfer
grease. If this grease is removed during testing, recoat
as described under regulator installation in this section.
To remove regulator (9) for testing, remove sense lead
nut (26) and grounded mounting screw (37). (See Fig.
13) It is not necessary to remove the regulator mounting
plate (54), but it may come off with the regulator (if it
does, pull the plate from the regulator and place it back
in the alternator to keep from contaminating the grease).
Check regulator on approved tester for SI type
regulators. If regulator tests “good”, return it to service.
If it tests “bad”, replace it. Install regulator as described
later in this section.
DIODE TRIO/CAPACITOR ASSEMBLY
5. Disconnect diode trio assembly’s (15) 3 phase leads
from the diode junction studs by removing the nuts
(25). (See Fig. 14) Disconnect diode trio assembly’s
capacitor lead from heat sink by removing screw (31)
and insulator (51). If necessary to remove from
alternator completely, disconnect diode trio assembly’s
“R” terminal lead (if used) from inside of “R” terminal
by removing nut (25), then remove attaching screw
(38) from grounding tab.
Figure 12. Checking Field Coil Resistance
Figure 13. Removing Regulator
Figure 14. Disconnecting Diode Trio Assembly
9
OHMMETER
9. REGULATOR
35. SCREW (GROUND)
36. SCREW (INSUL.)
36
9
35
26
9
36
41
35
1
53
54
37
1. HOUSING
ASSEMBLY
9. REGULATOR
26. NUT
36. SCREW (2)
37. SCREW
41. WASHER
52. LEAD
53. LEAD
54. PLATE
1. HOUSING
ASEMBLY
15. DIODE TRIO
25. NUT
31. SCREW (2)
37. SCREW
38. SCREW
40. WASHER
49. GROMMET
54. INSULATOR
31
15
40
38
1
49
51
25
26-5020
26-5021
26-5022