B3.9 and B5.9 Series Engines
Section 13 - Electrical Equipment - Group 13
Do not connect battery charging cables to any elec-
tronic control system part. This can damage the elec-
tronic control system parts.
Systems Analyzer/Battery Tester, Part No. 3377193
Use the systems analyzer/battery tester, Part No. 3377193,
to test the output amperage of maintenance-free or con-
ventional vent-cap batteries.
If the output amperage is low, use a battery charger to
charge the battery. Refer to the manufacturer's instruc-
Replace the battery if it will not charge to the manufac-
turer's specifications or will not maintain a charge.
Refer to the accompanying table to determine the battery
state of charge based on the specific-gravity readings.
Battery State of Charge
Specific Gravity @ 27°C
1.260 to 1.280
1.230 to 1.250
1.200 to 1.220
1.170 to 1.190
1.110 to 1.130
All batteries, including maintenance-free ones, can be
checked by measuring the voltage between the positive
(+) battery cable and the engine block ground (-). Note the
Using a remote start connection, attempt to engage the
starter while observing the voltage.
If the voltage reads less than 10 VDC, charge the battery.
If the voltage drops rapidly more than 2 VDC, replace the