Section 12 ELECTRICAL SYSTEM
Subsection 02 (CHARGING SYSTEM)
787 RFI Engines
Proceed as follows:
Remove the fuse from the holder with the RED
wire coming from the connector:
1
F15F09A
1. RED wire
– Connect an ammeter across the fuse holder.
– Start engine.
– Bringenginetoapproximately6000RPM.
– Note the reading. This is the current supplied
by the regulator.
– Reinstall fuse.
Remove the fuse from the holder with the
RED/PURPLE wire coming from the connector:
1
F15F0AA
1. Fuse holder
– Connect an ammeter across the fuse holder.
– Start engine.
– Bringenginetoapproximately6000RPM.
– Note the reading. This is the current actually
consumed.
– Reinstall fuse.
Substract the consumed current from the regula-
tor current. This gives the current supplied by the
regulator. It should be within 3 - 4 A.
CHARGING CURRENT = CURRENT FROM REGULATOR - CONSUMED CURRENT
If charging current is below specification, check
magneto output. If the magneto output is good,
try another rectifier/regulator. Recheck charging
current. If still out of specification, the fuel pump
or the MPEM current draw is too high.
If charging current exceeds specification, replace
the rectifier/regulator.
DC Voltage Test
All Models
Proceed as follows:
– Start engine.
– Connect a multimeter to battery posts. Set
multimeter to Vdc scale.
– Bringenginetoapproximately5500RPM.
If multimeter reads over 15 volts, regulator is de-
fective. Replace it.
NOTE: If it is continually necessary to add distilled
water to the battery, this indicates an over voltage
situation, requiring replacement of the rectifier/
regulator. If, on the other hand, the battery will not
stay charged, the problem can be any of the charg-
ing circuit components. If these all check good,
you would be accurate in assuming the problem
to be in the rectifier/regulator.
717 Engines
If there is no charging at the battery with the pre-
ceding voltage test, the following test can also be
performed.
Disconnect the connector housing of the rectifi-
er/regulator.
Using an appropriate terminal remover (Snap-on
TT600-4), remove the RED and BLACK wires from
the tab housing of the rectifier/regulator.
Reconnect the connector housing.
smr2004-Complete Line Up 563
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