RAM 3500 Truck 2WD V10-8.0L VIN W MDC (1999)
Brake Light Switch: Testing and Inspection
The content of this article reflects changes called for in TSB 26-12-98.
Stop Lamp Switch Terminal Identification
The stop lamp switch can be tested with an ohmmeter. The ohmmeter is used to check continuity between the pin terminals.
SWITCH CIRCUIT IDENTIFICATION
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Terminals 1 and 2: stop lamp circuit
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Terminals 3 and 4: RWAL/ABS module and Powertrain Control Module (PCM) circuit
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Terminals 5 and 6: speed control circuit.
NOTE: Disconnect switch harness before testing switch continuity.
SWITCH CONTINUITY TEST
With switch plunger extended, attach test leads to pins 1 and 2. Replace switch if meter indicates no continuity.
With switch plunger retracted, attach test leads to pins 3 and 4. Replace switch if meter indicates no continuity.
With switch plunger retracted, attach test leads to pins 5 and 6. Replace switch if meter indicates no continuity.