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LT 28 (1975-1991) LT 2D (1996-2003) Beetle (1960-1986) Caddy 3 (2003-2010)

Possible battery malfunctions (VW Beetle)

Malfunction	Cause	Solution
Electrolyte level too low	Overcharging the battery or evaporation of electrolyte (especially in summer)	Add distilled water to the proper level
Electrolyte leaks through the plugs	Charging voltage is too high	Check the voltage regulator and replace if necessary
Electrolyte leaks through the plugs	High electrolyte level	Pump out excess electrolyte
Electrolyte density is too low	The battery is dead	Charge the battery
	Generator faulty	Check the generator, repair or replace if necessary
	Short circuit in the electrical wiring	Check the wiring contacts
	The electrolyte contains excess water due to improper battery maintenance	Bring the acid content to normal
Electrolyte density is too high	Excess acid	Bring the acid content to normal
The battery output is low and the voltage drops	The battery is dead	Charge the battery
	Charging voltage is too low	Check the voltage regulator and replace if necessary
	The battery terminals are loose or corroded	Check the ground connection, tighten or replace the terminals if necessary
	Poor ground contact between the battery, engine, and body	Check the ground connection, restore it if necessary and tighten the threaded connections
	Excessive self-discharge of the battery due to contamination of the electrolyte	Replace the battery
	Battery sulfation (dirty white deposits on the plates)	Charge the battery with a weak current to break up the deposits. If after repeated charging and discharging the output power remains low, replace the battery
	The battery has reached the end of its service life or the active mass of the plates has been exhausted	Replace the battery
Insufficient battery charge	The generator, voltage regulator or connecting wires are faulty	Check the generator and voltage regulator; replace or repair if necessary. Check the condition and fastening of the wires
	Weak tension of the alternator drive belt	Tighten or replace the belt
	Too many energy consumers are connected	Install a battery with a higher capacity or a more powerful generator
Constant battery overcharging	The voltage regulator or generator is faulty	Replace the voltage regulator or check the generator

This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian

The text has been checked: Kolesnikov Artem

Previous articles
Checking the battery
Removal and installation the battery

Next articles
Generator — design description
Removal and installation the generator
Removal, installation and tensioning the generator drive V-belt
Possible generator malfunctions
Ignition system — general information
Maintenance of the ignition system

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Caddy 3 Beetle LT 2D LT 28

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