7.7 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 voltage from the generator exceeds this threshold.
A faulty regulator may recharge the battery insufficiently (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, especially the earth connections to the regulator;
– the battery is charged and not sulphated [see 7.8];
– the charger fuse is not blown.
A) Checking the lower charging limit
Start the engine and keep running at minimum (with the headligts on).
With the voltmeter tester, measure the voltage at the battery terminals. If the value does not rise but tends 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 rise and settle at 14-15 Volts after about 10-15 minutes.
If this level is exceeded to a point where the engine stops due to the self-resetting protection device cutting in
(at about 16 Volts), it means that the regulator is charging too much and must be replaced.
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WORKSHOP MANUAL
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MODEL YEAR 2016
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