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2004 Honda Accord alternator swap (partial PATCH test)

savWrencherApr 27, 2026

Tools

14mm socket
Breaker bar
New alternator (Bosch AL5039X recommended)
Serpentine belt tool

Step 1: Disconnect battery

Negative terminal first. Always.

Step 2: Remove serpentine belt

Rotate the tensioner clockwise, slip the belt off the alternator pulley.

Step 3: Unbolt alternator

Three 14mm bolts. Mark which is which — they're different lengths.

Step 4: Disconnect wiring

Main power lug (10mm nut) and the plug-in connector.

Step 5: Lift it out, drop new one in

Reverse of removal. Torque bolts to 30 ft-lbs.

Step 6: Battery, then test

Reconnect, start the car, check voltage at battery — should read 13.8-14.4V.

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