VW T4 AAB Charging Issues Due to Split-Charge Relay Fault

Examine the split-charge relay ground connection (Pin 85) for connectivity issues. If the relay is clicking, test for a steady signal from the alternator excitation wire. An unstable ground or fluctuating trigger signal causes the relay to rapidly cycle between open and closed states.


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VW T4 AAB Voltage Drop and Relay Clicking After Start
Automotive - Internal Combustion Engine
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Automotive - Internal Combustion Engine

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ID: rMJvPTwD3pJ4nN6OxPMA
Created: 8/18/2026, 9:36:11 PM
Version: 1.0
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