Verify all power connections in the interior control module before replacing any connectors. Check amperage ratings for each circuit; door locks and lighting circuits operate at 10A, while heater and wiper motors require 20A to 25A.
Use a multimeter to confirm continuity on circuits related to the ignition switch. Overloading circuits beyond their rated amperage can cause wire insulation damage and intermittent failures in auxiliary systems such as the stereo and dashboard gauges.
Label each connection with the corresponding relay or circuit number before disconnecting terminals. Maintain the original routing to prevent short circuits and preserve factory grounding points for the chassis and engine harnesses.
Electrical Panel and Amperage Guide for Classic 325 Series
Confirm all connections on the main under-dash power module before servicing any circuits. Headlight circuits carry 15A, while the heater fan and windshield wipers require 20A to prevent overheating of wiring harnesses. Use a digital multimeter to verify voltage at each terminal.
Label all terminals with their respective circuit identifiers to avoid misrouting. Relays controlling the fuel pump and ignition system are rated at 30A, and swapping them with lower-rated components can cause intermittent engine stalls and dashboard warning signals.
Interior Power Module Circuit Locations and Ratings
Verify all connections at the dashboard power module before replacing any components. Accessory circuits such as the radio and interior lights are rated at 10A, while climate control and defogger circuits require 20A for proper operation without overheating the wiring.
Label each terminal clearly using a color-coded system. Door lock actuators and power window circuits carry 15A, and improper connections can lead to blown circuits or intermittent operation of these systems.
Inspect the wiring harness for signs of corrosion near the module terminals. Circuits controlling the sunroof and rear defroster are designed for 20A and should never be substituted with lower-rated links, as this can trigger dashboard warning lights or cause functional failures.
Use a multimeter to test continuity before installing new relays. Interior lighting relays operate at 10A and must match the panel specifications to prevent overheating and maintain reliable operation of all auxiliary systems inside the cabin.