3/2002
7.9 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 connection to the regulator;
– the battery is charged and not sulphated [see 7.10].
A) Checking the lower charging limit
Start the engine and keep running at minimum with the headlights on. With the tester in the voltmeter function,
measure the voltage at the battery terminals. If the amount tends to fall, even slowly, it means that the regulator is
not charging sufficiently and must 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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