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Figure 36. Check Battery Voltage
Figure 37. Check Charging Voltage
D. Isolated Battery Voltage Check
See Figure 36.
In some cases, a short in the wiring or another compo-
nent could be causing a low level current draw on the
battery. This would be indicated by a slow drain on the
battery during times when the engine is off. The easiest
way to check this is to check the voltage with the battery
installed, and then with the battery uninstalled (isolated).
Then reconnect the battery terminals with an amp meter
in series with the battery and terminal. There should be
no current draw off the battery when all accessories are
off and the ignition key switch is in the OFF position.
E. Charging Voltage Check
See Figure 37.
To determine if the charging system is functioning prop-
erly, check the battery voltage while the engine is run-
ning. The charging system produces a slightly higher
voltage than the battery so that the battery will recharge
and there is enough energy remaining to supply power to
the electrical systems.
7 Electrical System Service
Component Tests
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