| Cause of malfunction | Method of elimination |
| When the ignition is turned on, the low battery indicator light does not light | |
| Broken wire between engine control unit and signal lamp | Fix the break |
| The signal lamp burned out | Replace the lamp |
| The low battery warning light does not go out after starting the engine | |
| Weak tension of the auxiliary drive belt | Replace the belt |
| The generator is faulty (the generator brushes are worn out or do not fit tightly to the contact rings, the generator excitation winding is burnt out, the diode bridge or voltage regulator is faulty) | Replace or repair the generator |
| Broken wire between the engine control unit and the generator, between the generator and the battery, or between the generator and the mounting block in the passenger compartment | Fix the break |
| The electronic engine control unit is faulty | Replace the electronic unit |
| The mounting block in the cabin is faulty | Replace the mounting block |
| The generator does not charge the battery | |
| Oxidation of battery terminals | Note, secure and lubricate the wire ends and battery terminals with petroleum jelly |
| The battery is faulty | Replace the battery |
| Weak tension of the auxiliary drive belt | Replace the belt |
| The mounting block in the cabin is faulty | Replace the mounting block |
| The generator voltage regulator or the engine control unit is faulty | Replace the voltage regulator or ECU |
| The battery is recharging | |
| The generator voltage regulator or the engine control unit is faulty | Replace the generator voltage regulator or engine control module |
| Increased voltage drop in the generator-battery circuit | Check, clean, tighten or replace contact connections in the ignition switch (lock), fuse and relay mounting blocks, connectors, check the connection of the generator housing to the "ground" |
(Information for this article was taken from the website: FORDBOOK.ru)