Recharge Circuit Check - Stiga MP 84/98 Workshop Manual

WORKSHOP MANUAL
MP 84/98 - MP 84/98 Hy
General informations
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Map of functional units

RECHARGE CIRCUIT CHECK

The job of the voltage regulator is to supply a flow of
current to the battery at a constant voltage of about
14 -15 Volts, cutting in every time that the output volt-
age from the generator exceeds this threshold.
A faulty regulator may recharge the battery insuf-
ficiently (therefore needing frequent recharging) or,
otherwise, may supply overloading that causes the
self-resetting protection to cut in.
Before checking the recharge circuit, make sure that:
– all connections are correct;
– the earth connections are firmly connected, espe-
cially the earth connection to the regulator;
– the battery is charged and not sulphated;
– the charger fuse is not blown.
A) Checking the lower charging limit
Start the engine and keep running at minimum with
the headlights on.
With the voltmeter tester, measure the voltage at the
battery terminals. If the value does not rise but tends
CHAPTER REVISION FROM ...
7.8 0 2018
to fall, even slowly, it means that the regulator is not
charging sufficiently and must be replaced.
If the voltmeter shows no value it means that the
charger fuse is blown.
only with a Honda engine:
check the recharge relay. On moving the key from
«OFF» to «ON» and vice versa, the ticking of
the relay contacts should be heard; otherwise it
should be replaced.
B) Checking the upper charging limit
Start the engine and take it to maximum speed. With
the tester in the voltmeter function, measure the
voltage at the battery terminals. The amount should
slowly rise and settle at 14-15 Volts after about 10-15
minutes.
If this value is exceeded to the extent that the engine
stops due to the self-resetting protection cutting in
(at approximately 16 Volts) it means that the regulator
is charging too much and must be replaced.
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