Starting System; Battery: Removal & Installation - Chevrolet Trailblazer Service Manual

Starting System

WARNING
To avoid personal injury and/or vehicle damage, refer to the service precautions at the
beginning of this section.
General Information
The starting system includes the battery, starter motor and solenoid, ignition switch, circuit
protection and wiring connecting all of the components. An inhibitor switch located in the
Transmission Range (TR) sensor is included in the starting system to prevent the vehicle
from being started unless the transmission is in PARK. A similar function is performed by
the clutch switch in manual transmission vehicles.
When the ignition key is turned to the START position, current flows and energizes the
starter's solenoid coil. The solenoid plunger and clutch shift lever are activated and the
clutch pinion engages the ring gear on the flywheel. The switch contacts close, and the
starter cranks the engine until the engine starts.
To prevent damage caused by excessive starter armature rotation when the engine starts,
the starter incorporates an over-running clutch in the pinion gear. This disengages the
starter motor from the engine when the engine begins to run on its own.
Battery
Removal & Installation
To Remove:
CAUTION
Make sure to connect the correct battery cables to the correct battery terminals. Reversing
the battery's polarity may result in extensive damage to electrical components.
1. Turn the ignition switch to the OFF position.
2. Turn off all lighting and accessories.
3. Disconnect the negative battery cable first, and then the positive cable.
4. Remove the hardware securing the battery to the tray.
5. If equipped, remove the battery cover.
6. Remove the battery from the tray.
To Install:
1. Position the battery on the tray and install the cover if equipped.
2. Clean the battery terminals and cable ends with a wire brush.
3. Install the battery hold down bracket and fasteners. Do not make the fastener so
tight as to damage the battery.
4. Connect the positive battery cable fist and then the negative cable.