Removing a generator on a Nissan Almera: instructions with photos and advice from experts

Replacing or repairing a generator Nissan Almera - a task that every owner of this car faces sooner or later. A faulty alternator will manifest itself as dim headlights, a low battery, or a flashing charging light on the dashboard. A car service center will charge from 3 to 6 thousand rubles for this work, but if you have the tools and patience, you can do it yourself in 1–2 hours.

In this article we will analyze the process of removing the generator on all generations Almera (including N16, G15 And B10), we will indicate the necessary tools, show connection diagrams and warn against common mistakes. We will pay special attention to the nuances that are not written in standard manuals - for example, how to do without removing the right headlight or what to do if the fastening bolt is stuck.

Preparing for work: tools and conditions

Before you begin dismantling, make sure you have everything you need. You will have to work in a cramped engine compartment, so without the right tools you risk stripping threads or damaging wiring.

Here minimum setwhich you will need:

• 🔧 Set of heads (required) 10 mm, 12 mm, 14 mm) with extension and ratchet wrench
• 🔧 Socket wrench on 17 mm (for generator pulley nut)
• 🔧 Screwdriver with flat and Phillips blade (for removing protection and chips)
• 🔧 Jack and stops (if access from below is required)
• 🔧 Penetrating lubricant (WD-40 or Liqui Moly) for stuck bolts
• 🔧 Multimeter (to check the generator after removal)

If you have Nissan Almera G15 (2013–2019), additionally prepare belt tensioner wrench (usually on 13 mm). On models N16 (2000–2006) it may be necessary to remove the right headlight - this requires a plastic spatula to avoid scratching the bumper.

⚠️ Attention: Do not attempt to unscrew the alternator pulley nut until the belt is removed! This will cause the shaft to rotate and risk bearing damage.

It is better to do the work in a garage or on a level area. If there is no inspection hole, jack up the car and secure it with stops. Disconnect the battery necessarily - first the negative terminal, then the positive one. This will protect you from a short circuit if the wires accidentally touch.

Generator connection diagram for Nissan Almera

Before removing the generator, it is useful to understand how it is connected to the on-board network. This will help you avoid mixing up the wires during reassembly and avoid diagnostic errors.

At all Almera (regardless of generation) the generator has three main contacts:

• 🔌 B+ - a thick wire (usually red or black) going to the battery through the fuse
• 🔌 D+ - a thin wire (usually white or green) connecting to the charging lamp on the panel
• 🔌 Weight — mounting the generator to the body (grounding)

On Almera N16 with engine QG15DE or QG18DE There may be an additional connector for the voltage regulator. On G15 with motor HR16DE the circuit is simplified - there are only two wires (B+ And D+), and the regulator is built into the brushes.

Model Almera	Generator type	Rated current (A)	Connection features
N16 (2000–2006)	Bosch or Mitsubishi	80–90	Additional connector for voltage regulator
G15 (2013–2019)	Denso or Valeo	100–110	Built-in regulator, two wires (B+, D+)
B10 (1995–2000)	Nippondenso	60–70	Separate relay-regulator on the body

If you plan to check it after removing the generator, remember: normal voltage on the terminals there should be 13.8–14.5 V with the engine running. If the multimeter shows less 13 V or more 15 V, the generator is faulty.

Step-by-step instructions: how to remove the generator on a Nissan Almera N16

Let's start with the most common generation - Nissan Almera N16. Here the process is complicated by the cramped engine compartment, but with the right approach everything will work out.

Step 1: Removing the alternator belt

• 🔧 Loosen the tension roller nut with a wrench 13 mm (on some models - on 14 mm).
• 🔧 Turn the roller counterclockwise to loosen the belt.
• 🔧 Remove the belt from the generator pulley and take it to the side.

Step 2: Disconnecting the Wires

• 🔌 Disconnect the chip with wires D+ (thin connector).
• 🔌 Unscrew the nut securing the wire B+ (key to 10 mm) and remove the terminal.
• 🔌 If there is an additional regulator connector, carefully pry it off with a screwdriver.

Step 3. Dismantling the generator

• 🔧 Unscrew the two generator mounting bolts: upper (key on 12 mm) and lower (key on 14 mm).
• 🔧 The bottom bolt can be hidden under the bracket - use a head extension.
• 🔧 If the bolts are stuck, treat them WD-40 and wait 10–15 minutes.

On Almera N16 The compressor may be interfering with the air conditioner. In this case, you will have to slightly lift the engine with a jack (under the crankcase) or remove the right headlight for better access.

Loosen the tension roller and remove the belt|

Disconnected the battery (first minus, then plus)|

We photographed the location of the wires|

Treated the bolts with penetrating lubricant|

We prepared a place for laying the removed generator -->

⚠️ Attention: On Almera N16 with engine QG18DE The lower bolt of the generator sometimes breaks when unscrewing. If you feel resistance, do not apply force - it is better to use an impact wrench or heat the bolt with a hair dryer.

Features of removing the generator on the Nissan Almera G15

On Almera G15 (restyled version N16) the process is somewhat simpler thanks to a more thoughtful layout of the engine compartment. However, there are some nuances here.

Main differences from N16:

• 🔧 There is no need to remove the headlight - access to the generator is freer.
• 🔧 The belt tension roller is adjusted automatically (on some modifications).
• 🔧 The generator is mounted on three bolts, not two.

Procedure:

1. Remove the belt: loosen the tensioner with a wrench 13 mm and move the roller to the side.
2. Disconnect the wires: first the chip D+, then the terminal B+ (nut on 10 mm).
3. Unscrew the three fastening bolts: two on top (key on 12 mm) and one below (the key is on 14 mm).
4. Carefully pull the generator up without touching the radiator.

On G15 with engine HR16DE Be careful with the plastic timing belt cover - it is fragile and can crack if you move it carelessly. If the casing is in the way, remove it by unscrewing the two bolts on 10 mm.

How to check a removed generator without a stand?

Connect the positive wire (B+) to the “+” of the battery, and the negative one to the generator housing. Close the contact D+ to ground (for example, through a 12V light bulb). If the generator is working properly, it will begin to produce a voltage of ~14V when the pulley rotates (you can turn it with a drill).

Common mistakes and how to avoid them

Even experienced car owners sometimes make mistakes when removing the generator. Here are the most common ones and how to prevent them:

1. Thread breakage on mounting bolts

Cause: Use of an incorrect wrench or excessive force. On Almera N16 The bottom bolt of the generator often sticks to the bracket. To avoid failure, before unscrewing, treat it with a penetrating lubricant and let it sit for 10-15 minutes. If the bolt does not budge, try lightly tapping it with a hammer through the metal spacer.

2. Damage to wiring

Reason: sudden jerking of the chips or incorrect disconnection of the terminals. Always disconnect the negative terminal of the battery first, then the positive terminal. Disconnect the chips by pressing the plastic lock, rather than pulling the wires.

3. Loss of small parts

Reason: unorganized workspace. Place all removed bolts and nuts in a separate box or magnetic bowl. It is especially easy to lose washers under the terminal. B+ - without them there will be poor contact.

4. Incorrect belt installation

Reason: incorrect routing of the belt along the rollers. Always check the diagram (it can be found in the manual or on a sticker under the hood). On Almera G15 The belt should go through: crankshaft pulley → generator → tension roller → pump (if equipped).

How to make reassembly easier

Putting the generator back on often takes longer than removing it. To avoid problems, follow these tips:

1. Check the condition of the belt

If the alternator belt is cracked, split, or shows signs of oil, replace it. On Almera recommended belt life - 60,000 km, but with intensive use it wears out faster.

2. Clean contacts

Before connecting wires, clean the terminals B+ And D+ fine sandpaper. Oxidized contacts lead to poor battery charging.

3. Tension the belt correctly

On Almera N16 the belt should bend by 10–15 mm when pressing with a finger between the generator and crankshaft pulleys. On G15 with an automatic tensioner, check the operation of the roller - it should spring freely.

4. Check operation after assembly

After installing the generator, start the engine and check:

• 🔋 Battery voltage (should be 13.8–14.5 V).
• 💡 Are the charging lamps on the panel lit (should go out after starting).
• 🔊 Are there any extraneous noises (creaks, hums) from the generator?

⚠️ Attention: If, after replacing the generator, the charging lamp on the panel is on, but the multimeter shows normal voltage, the problem may be in the wire D+ or relay regulator. Check the continuity of the wire from the generator to the dashboard.

FAQ: Frequently asked questions about removing the generator on Nissan Almera

Is it possible to remove the generator on Almera N16 without removing the right headlight?

Yes, but it's more complicated. You will have to work through the narrow space between the radiator and the body. If you have large hands or little experience, it is better to remove the headlight - it will take an extra 15–20 minutes, but will save your nerves. To remove the headlight, unscrew two bolts under the hood and one from below (under the bumper), then carefully pull it forward.

Which generator is better to install on the Almera G15 - the original or an analogue?

Original generators (Denso or Valeo) more reliable, but more expensive (from 12,000 rubles). Good analogues: Bosch (article 0 986 041 830), Hella (8EL 011 671-031) or Delphi (AG10104). When choosing, check the current matches (at least 100 A) and fastenings. Cheap Chinese generators often fail after 1–2 years.

What should I do if the battery does not charge after replacing the generator?

There are several reasons:

1. Incorrect wire connection (B+ And D+ mixed up).
2. The new generator is faulty (check the diode bridge).
3. Broken wire D+ or contacts are oxidized.
4. The relay-regulator has failed (on N16 it can be separate).

First check the voltage at the alternator terminals with the engine running. If it is lower 13 V, the problem is in the generator. If there is voltage, but the battery does not charge, look for an open circuit.

Do I need to change the generator bearing when replacing it?

If the generator has been disassembled (for example, to replace brushes), then it is advisable to check the bearings. Signs of wear: shaft play, hum or squeak when rotating. On Almera Most often the front bearing (on the pulley side) fails. Its article: 6202-2RS (size 15×35×11 mm). It is better to entrust bearing replacement to a specialist - a press is required.

Is it possible to drive with a faulty generator?

Briefly, yes, but not for long. The battery will discharge and after 30–50 km the car will stall. If the generator is completely out of order, turn off all unnecessary consumers (lights, music, heating) and go straight to the service center. Driving for a long time "on the battery" leads to a deep discharge, after which the battery may not recover.