226
WSG-1068 CHARGING SYSTEM
Check for current drains on the battery in excess of 50
milliamps (0.050 amp) with all the electrical
accessories off and the engine off. Current drains can
be tested with the following procedure:
1. Make sure the junction box/fuse panels are
accessible without turning on auxiliary
components.
2. Operate the engine at least five minutes and
exercise systems.
3. Allow the engine to sit with the key OFF for at
least 40 minutes to allow modules to time
out/power down.
4. Connect a fused jumper wire between the
negative battery cable and the negative battery
post to prevent modules from resetting and to
catch capacitive drains.
5. Disconnect the negative battery cable from the
post without breaking the connection of the
jumper wire.
NOTE: It is very important that continuity is not
broken between the battery and the negative
battery cable when connecting the meter. If this
happens, the entire procedure must be
repeated. Connect the tester between the
negative battery cable and the post. The meter
must be capable of reading milliamps and
should have a 10amp capability.
NOTE: If the meter settings need to be switched or the
test leads need to be moved to another jack, the jumper
wire must be reinstalled to avoid breaking continuity.
6. Remove the jumper wire.
NOTE: Amperage draw will vary from engine to engine
depending on the equipment package. Compare to a
similar engine for reference.
NOTE: No engine application should have more than a
50 mA (0.050 amp) draw.
7. If the draw is found to be excessive, pull fuses or
disconnect suspected draws one at a time and
note the current drop. Do not reinstall the fuses
or connections until you are finished testing.
8. Check the wiring for any auxiliary circuits that
run from the battery. Disconnect these circuits if
the draw is still excessive.
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