Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1985ASTRO VAN M L4-151 2.5LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSBATTERY - DIAGNOSIS AND CHARGINGV.BATTERY CHARGING
1985 Chevrolet Astro Van M L4-151 2.5L
V.Battery Charging
1985 Chevrolet Astro Van M L4-151 2.5LSECTION V.Battery Charging
Dealership service personnel are advised to refer to Cadillac Serviceman Bulletin T-83-12, Group 6D for detailed instructions on:
1. Battery Side Terminal Connections
2. Battery Charging
3. Charging Time Required
4. Load Testing
NOTES:
1. The majority of discharged batteries can be recharged using normal battery charging procedures. Some deeply discharged batteries or batteries which have been allowed to remain in a discharged state may need a higher charge voltage initially to start the recharging process.
2. The Freedom battery is more resistant to overcharging damage than conventional batteries. Boost or Quick-Charge settings on battery chargers may be safely used in most instances. (This is not true of other non-Delco OE batteries and many aftermarket batteries.)
3. With the battery at room temperature, voltages as high as 15.0 volts to 16.0 volts may be safely used without causing battery damage. Cold batteries require more voltage to cause them to accept current. Warm batteries will accept less voltage without causing overcharging.
4. After starting the battery on charge and periodically during the charging process, the battery should be cheeked to assure that it is not overcharging. Overcharging can be identified by excessive battery case temperature and electrolyte boiling or bubbling (or spewing out the vents).
^ Battery case temperatures of about 125~F is the maximum which should be allowed. Check by hand feel and reduce the charge rate if high temperatures are found.
^ Excessive electrolyte bubbling or boiling indicates that the charge voltage is too high and that the battery is being forced to accept too much current. Turn down the charge rate if high temperatures are found.
^ A battery with an internally shorted cell will show signs of overcharging at normally acceptable voltages. If charge voltages of around 13 volts result in overcharging (on a battery at room temperature or cooler), disconnect the battery and check the voltage. Batteries with internal shorts will exhibit a drop in voltage over time. Batteries with internal shorts should be scrapped.
1. Battery Side Terminal Connections
2. Battery Charging
3. Charging Time Required
4. Load Testing
NOTES:
1. The majority of discharged batteries can be recharged using normal battery charging procedures. Some deeply discharged batteries or batteries which have been allowed to remain in a discharged state may need a higher charge voltage initially to start the recharging process.
2. The Freedom battery is more resistant to overcharging damage than conventional batteries. Boost or Quick-Charge settings on battery chargers may be safely used in most instances. (This is not true of other non-Delco OE batteries and many aftermarket batteries.)
3. With the battery at room temperature, voltages as high as 15.0 volts to 16.0 volts may be safely used without causing battery damage. Cold batteries require more voltage to cause them to accept current. Warm batteries will accept less voltage without causing overcharging.
4. After starting the battery on charge and periodically during the charging process, the battery should be cheeked to assure that it is not overcharging. Overcharging can be identified by excessive battery case temperature and electrolyte boiling or bubbling (or spewing out the vents).
^ Battery case temperatures of about 125~F is the maximum which should be allowed. Check by hand feel and reduce the charge rate if high temperatures are found.
^ Excessive electrolyte bubbling or boiling indicates that the charge voltage is too high and that the battery is being forced to accept too much current. Turn down the charge rate if high temperatures are found.
^ A battery with an internally shorted cell will show signs of overcharging at normally acceptable voltages. If charge voltages of around 13 volts result in overcharging (on a battery at room temperature or cooler), disconnect the battery and check the voltage. Batteries with internal shorts will exhibit a drop in voltage over time. Batteries with internal shorts should be scrapped.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.