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Autopapyrus · Daihatsu Terios (1st generation)
https://autopapyrus.com/guides/daihatsu/terios/alternator-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Daihatsu Terios (1st generation): Alternator Replacement

On the HC-EJ, the alternator is driven by a belt from the crankshaft and is mounted on a bracket on the engine. Belt tension is adjusted by pivoting the alternator. The exact procedure for this model is not documented in publicly available service materials, so the general principle is given below. Check tightening torques against the manufacturer's specifications.

Difficulty: Medium Time: 1-2 hours Steps: 12 Tools: socket and wrench set (usually 10, 12, 14, 17 mm), ratchet with extension, torque wrench, pry bar or breaker bar for tensioning the belt, multimeter, battery terminal wrench

Part

  • 🔩 complete alternator for the 1.3 HC-EJ engine (new or remanufactured). Before buying, compare the old and new alternators: mounting ear shape, pulley (number of grooves and diameter), connector, and terminal positions. Buy a new drive belt if needed
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes AutoFix (online) and 1 more. See manuals →

Step by step

12 steps
  1. Make sure the alternator is really the cause. Measure the battery voltage with the engine running: normal is about 13.8-14.5 V. Check the condition of the belt, terminals, and ground connections, then replace the unit.
  2. Shut off the engine and let it cool down. Disconnect the negative battery terminal and move it away from the post.
  3. If necessary, remove the air duct, hoses, or shield that block access to the alternator. If access is limited from below, remove the engine undershield.
  4. Take a photo of the wiring connections. Unplug the connector and remove the nut from the B+ power wire on the back of the alternator. Do not let this wire touch ground: it is live even with the battery terminal removed, because it is on the starter side.
  5. Loosen the bolt securing the alternator to the adjuster bracket and the main pivot bolt of the alternator. Move the alternator toward the engine to slacken the belt, and take the belt off the pulley.
  6. While supporting the alternator by hand, remove the mounting bolts and take it out downward or upward, depending on access. The unit is heavy, so be careful not to damage hoses or wiring harnesses.
  7. Compare the new alternator with the old one. If needed, transfer the pulley or brackets following the manufacturer's instructions.
  8. Install the new alternator, tighten the bolts finger-tight, and fit the belt over all the pulleys. Check that the belt is seated in the grooves.
  9. Tension the belt by pivoting the alternator or using the adjusting bolt. Belt deflection on the longest run, when pressed with a finger, should be about 8-12 mm. To do this, lock the adjustment in place and finally tighten the bolts to the specified torque.
  10. Connect the connector and the B+ wire (tighten carefully, without stripping the thread), then reinstall the shield and air duct. Connect the negative battery terminal.
  11. Start the engine and turn on the low beams, rear window defogger, and blower fan. Battery voltage should stay around 13.8-14.5 V, and the charge warning light should go out. Listen for unusual noises, whistling, or belt squeal.
  12. After 100-200 km, check the belt tension again: a new belt stretches.

Common mistakes and warnings

  • Do not disconnect the battery terminal while the engine is running. It can damage the electronics. If a discharged battery is being charged by the alternator, charge the battery with a battery charger first. A new alternator is not designed to recover a deeply discharged battery. If replacing the alternator does not fix the problem, check the wiring, fuse, and ground connection.