Table of Contents
Advertisement
va_
iu
7,
Remove and clean battery terminals and cable terminals in a warm
water solution with baking soda to dissolve corrosion, Tighten nuts
on starter solenoid terminals.
Readings below B volts at the starter
usually indicate a defective starter cable or burned solenoid con-
tacts.
Replace defective parts as required for good starter per-
formance.
8.
Replace worn or corroded cables as required to correct condition.
g.
Do not crank for mor_ than 15 seconds at a time,
Allow starter
motor to cool off for 30 seconds between tests,
10. When tests are completed, reconnect coil for normal starting.
The function of the charging system is to keep the battery In an optimum
state of charge, to provide the necessary current to start the engine,
and operate the electrical systems when the engine is running.
The
battery is charged by an alternator that is driven bye
belt connected
to a pulley on the engine crankshaft.
The alternator generates an alter-
nating current (A, C. ) that is converted by internal diodes Into direct
current (D. C,) to charge the battery,
A regulator is needed in the
charging system because the alternator output voltage increases as the
engine speed increases,
The regulator keeps the alternator output voltage
at a safe upper limit so the battery will not be overcharged and the
headlights and accessories will not be damaged by excessive voltage.
I.
Place function switch in the VOLTS position.
The Center Slide Switch
must be in the OTHER TESTS position.
2.
Slide the RANGE SELECTOR switch to the LOW range(O-16
volts) for
12 volt systems or to the HIGH range (0-32 volts) for 24 volt sy-
stems.
Read test results on the appropriate VOL_S scale.
3.
Be sure the shunts are in position on the Battery Amps
Adapter as
shown in Key No.I Page 5, before starting the vehicle.
CAUTION: TIGHTEN ALL NUTS ON THE BATTERY ADAPTOR FIRMLY WITH A WRENCH
TO AVOID EXCESSIVE HEAT AND POSSIBLE SHUNT DAMAGE.
4.
Before performing Step 5, start the engine and allow it to run for
10 to 15 minutes or until the engine compartment is warm, then shut
it off.
In order to obtain proper results from this test, the
battery must be partially discharged.
To accomplish this, switch
on the headlights and put the blower on HIGH for a minimum of one
minute, or remove the distributor wire to prevent the car from
starting and crank the engine for about 30 seconds, then follow step 5,
5,
Start the engine.
Operate at a fast idle (approximately 1500 RPM).
Open the starter amps shunt.
Note the battery charging voltage.
The
meter should read over 12 volts and slowly rise to regulated voltage
in a few minutes (15 I/2 volts maximum).(Figure 12)
6.
Move the Center Slide Switch to the CHARGING AMPS position and note
the alternator charging rate compared to vehicle specifications.(Figure 12)
Shortly after starting, an alternator in good condition should charge
from 50 to 80% of its rated capacity, and slowly decrease as the
battery regains its charge.
The charging voltage will slowly rise
as the ampere rate decreases and maximum regulated voltage Is obtained.
7.
Move the Center Slide Switch tO the OTHER TESTS position again for
voltage reading and operate the engine at fast idle until the
charging voltage stops increasing.
Note the maximum voltage and compare
to vehicle
specifications.
8.
If the charging voltage exceeds IB I/2 volts
or as specified, replace
or adjust the voltage regulator.
If the voltage reading is too high,
the defect could be:
Hide quick links:
Advertisement
Table of Contents
