Suzuki Wagon R Manual page 3967

6H4-6 CHARGING SYSTEM (Z10XEP AND Z12XEP ENGINES)
Undercharged battery
This condition, as evidenced by slow cranking or low specific
gravity can be caused by one or more of the following conditions
even though indicator lamp may be operating normal.
Following procedure also applies to cars with voltmeter and
ammeter.
• Make sure that undercharged condition has not been caused
by accessories left on for extended period of time.
• Check drive belt for proper tension.
• If battery defect is suspected, refer to "Battery Description" in
this section.
• Inspect wiring for defects. Check all connections for tight-
ness and cleanliness, battery cable connections at battery,
starting motor and ignition ground cable.