GMC 1989 Light Duty Truck, Руководство по ремонту, Страница: 658 / 998

6D2-6 GENERATOR
An ohmmeter can not be used to test the delta stator for
shorts or opens. Noticeable discoloration at any place on
the assembly usually indicates a problem in the stator
windings.
RECTIFIER BRIDGE CHECK (Figure 12)
To check the rectifier bridge, connect the ohm m eter to
the grounded heat sink and one of the three term inals,
pressing down firm ly on the flat metal clip. Observe the
ohmmeter reading and reverse the lead connectors to the
grounded heat sink and the same metal clip. If both read­
ings are the same, replace the rectifier bridge. A good recti­
fier bridge will give one high and one low reading. Repeat
this same test between the grounded heat sink and the
other two terminals, and between the insulated heat sink
and each of the three term inals. This makes a total of six
checks, with two readings taken for each check.
Some digital ohm meters cannot be used to check diodes
in the rectifier bridge. Consult ohm m eter m anufacturers to
determ ine ohm m eter capabilities.
Figure 12— Rectifier Bridge Check
REGULATOR
The regulator cannot be checked with an ohm meter. Use
only an approved tester to test regulators of this type.
ASSEMBLY
BRUSH HOLDER REPLACEMENT
Important
A design change in the brush holder and slip ring
end frame prevents early design brush holders from
being installed in later design S.R.E. fram es unless
the brush holder assem bly is m odified (figure 13).
Remove or Disconnect
Two locators from the brush holder with needle nose
pliers or side cutters.
• File the jagged edges down to the level of the
surrounding material keeping loose particles
away from the brush slots.
Blow away any dust.
SLIP RING END FRAME
1.
Install or Connect (Figures 4, 7, 8, 9 and 14)
1. “ BAT” term inal (76) into the end frame.
2. Rectifier bridge (227).
3. Capacitor.