Husqvarna 2011 SMS 125, Workshop Manual

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M.12
H02546
H06647
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H02545
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ELECTRICAL SYSTEM
Ed. 05-2011
CHARGING SYSTEM INSPECTIONS
Current loss at the battery
Remove the saddle (as outlined in the relevant paragraph) to gain access to
the battery (1).
Disconnect the BLACK negative cable from the battery.
Measure current across the negative terminal of the battery and the negative
cable using a meter. A reading greater than 1 mA indicates current loss.
If the vehicle is to remain unused for long periods, it is recom-
mended to disconnect the battery from the electrical system and
store it in a dry place.
Regulated voltage
Remove the saddle (as outlined in the relevant paragraph) to gain access to
the battery.
With the engine warmed up and running at slightly above 3,000 rpm, measure
voltage across the positive and negative terminal of the battery using a meter
(the battery must be charged when performing this test). If reading is outside a
12.5-14.5 V range, check generator and voltage regulator/rectifier as described
in the relevant paragraph.
Voltage regulator/rectifier inspection
With the lights off, keep engine running at 6,000 rpm. Battery voltage shall
progressively increase until reaching regulator (1) calibrated value (approx.
14-14.5 V), while charging current shall progressively decrease until reaching
a value of 0.5 A.
- If current does not decrease and voltage increases above the 15 V limit,
regulator (1) is faulty and must be replaced.
- If, on the other hand, voltage stays below approx. 13 V and current is always
high, battery could be flat or faulty. Charge battery, and check battery charge
level.
- If voltage does not increase until reaching the above-specified values and
current is very low, check alternator efficiency.
To check alternator efficiency, disconnect the 3 yellow cables from regulator,
check that yellow cables or winding are not grounded using a tester or a
current indicator lamp. If the check result is OK, regulator is faulty and must
be replaced.
Voltage regulator
The voltage regulator (1) incorporates the diodes used to rectify the generator
current output.
It also incorporates an electronic device that adjusts charging voltage to battery
charge: if battery charge is low, charging voltage will be lower.
Do not disconnect the battery cables while the engine is run-
ning, or the regulator will suffer irreparable damage.