Car electrics — clear, practical, from a working pro

What a car’s electrical system is made of and what each part does: battery, alternator, starter, ground, fuses, relays and control units.

How to tell a battery’s charge from its voltage, why it lets you down in winter, and how to jump-start and charge it properly.

Where the fuses and relays are in a car, how to check and replace them, what the colors mean, and why you must never fit a higher rating or bypass a fuse with wire.

What red, yellow and green lights on the dash mean, and when you must not keep driving.

How to use a multimeter to check the battery and charging, find a blown fuse and do a simple parasitic draw test.

Step-by-step logic: starter, dashboard and immobilizer, fuel pump priming, fault codes — from simple to complex.

What OBD-II is, how to read codes, what the letters and numbers mean, and why you shouldn’t just clear the codes.

What to write down about a problem before you see a mechanic, what to ask about price, timing and warranty, which scan report to ask for, and the signs that you’re being sold parts you don’t need.

Where a car’s electrics and exhaust are genuinely dangerous: hybrids and EVs, airbags, xenon lights, carbon monoxide and working under the hood.

How to charge safely at home and at a station, why the car won’t switch on because of its small 12 V battery, what happens to range in winter, how to transport it, and what an owner must not touch.

How glow plugs and preheating work, why fuel matters in winter, and what to do if your diesel won’t start in the cold.

How to switch a parking heater on and off properly, why it goes into a fault, and what you can check yourself before heading to a mechanic.

Why a car alarm can drain the battery and stop the key fob from working, how to unlock and start the car with the key, and when you need an installer.

How to connect a dashcam, a USB charger, a head unit and auxiliary lights without burning the wiring or causing faults in the car.

Which bulbs your headlights use and how to replace them, why you can’t put xenon or LED bulbs in halogen headlights, where the “bulb out” error comes from, and how to check headlight aim.

How to replace wiper blades yourself, work out why the washer won’t spray and the rear window or mirrors won’t heat, and what to do if the charging light comes on and the alternator belt is suspect.

What to check in your car’s electrical system before a long trip and before winter, and what kit to carry with you.

What tools you need at the start, how to set up your workspace, check in a car, explain the price and timeline to the customer, give a warranty and a report, and how to keep growing.

How to dress, what to cover the car with and how to behave inside it, so the customer sees a professional and not a backyard garage job.

Ohm’s law, power and voltage drop — the foundation all electrical diagnostics is built on.

How to measure voltage under load, voltage drop on the positive and ground sides, resistance and current — and which mistakes to avoid.

Symbols, wire colors and sizes, DIN 72552 terminal numbers, and how not to mix up connector pins.

Pins 30/85/86/87/87a, why a relay has a diode or resistor, and how to test the relay itself and its circuit.

Potentiometers, thermistors, Hall-effect and inductive sensors, MAF, MAP and oxygen sensors: how they work and how to test them.

Injectors, ignition coils, solenoid valves, throttle motors: how the ECU controls them and how to test them.

How diodes, Zeners, transistors and MOSFETs work, where they sit in the car — from the alternator to the ECU outputs — and how to read measurements on them with a multimeter and a scope.

What sections make up a control module’s circuit board — the power supply and 5 V regulator, the processor and crystal, memory, input circuits, output stages, bus transceivers — and how they connect to the connector.

What you need to repair modules on the bench — antistatic protection, a bench power supply with current limiting, a soldering station, a hot-air station, magnification and cleaning — what you must never do, and how to remove and install a module on the car.

How to power a module on the bench: +30, +15, all grounds, the main relay and output power, the diagnostic line to the adapter, 12 and 24 V — and how to tell from the current whether the module has woken up.

What a permanent module test bench is built from — a power supply with current limiting, a fuse, “+30” and “+15” switches, a main relay, adapter harnesses and a jack panel, loads, a diagnostic line, a crankshaft simulator and an oscilloscope — and how to check the bench before the first module.

The order of checks when the scan tool can’t see a module: power and grounds at the connector, current draw, the 5 V regulator, the crystal, the CAN transceiver, traces and vias, signs of moisture — and how to tell a module fault from a fault in the car’s wiring.

What an ELM327 adapter with an app, a multi-brand scan tool and dealer software can do, why a cheap adapter doesn’t see all the modules, and how to connect to a passenger car or a truck without damaging anything.

Where diagnostics begins: talking to the customer, scanning all modules, saving codes and freeze frames before clearing, readiness monitors — and why clearing a code doesn’t mean fixing it.

Current, stored and pending codes, the freeze frame, how P/B/C/U and SPN/FMI codes are structured — and how to find the one to start with in a pile of codes.

Which live data to watch at warm idle and in what order — rpm, temperature, voltage, MAF and MAP, throttle, ignition timing, injection, oxygen sensors, trims — and how to cross-check them against each other.

How the module adjusts the mixture from the oxygen sensor, what plus and minus mean in short-term and long-term trims, how to tell an air leak from a weak fuel supply, and what narrowband, wideband and downstream sensors show.

What a car alarm is made of, what the control unit “hears” on its inputs and controls on its outputs, how a two-way fob differs from a one-way fob, and what a GSM module adds.

How an analog hookup differs from a CAN connection, how to check a car against the maker’s compatibility list, when GSM and remote start are needed, and how to explain the price difference to a customer.

What tools an installer needs, how to prepare the car and the workstation, when to disconnect the battery terminal, why airbag harnesses are left alone, and why you take “before” photos.

Where to take constant +12 V and the ignition positive, where to put the fuse and how to make the ground so the alarm doesn’t reset or give false alarms.

Which business forms exist in 2026, why an IP suits an auto electrician and a small repair shop, when to consider an LLP, and why the self-employed regime doesn’t cover car repair.

What an electronic digital signature (EDS) is, where to get one and how to protect it, who can become an IP, and how to register in 2026: eGov and eLicense, E-Salyq Business, Kaspi, Halyk, or in person at the tax office.

What OKED is, which code an auto electrician and a repair shop should use, when you need a second code for selling parts, which nearby activities are banned on the simplified regime, and how to add or change a code.

Simplified or general regime: the 4% rate and the maslikhat decision, the income limit, the half-year and Form 910.00, how the general regime (OUR) differs, and when a shop becomes liable for VAT.

Which payments an IP makes for themselves every month in 2026 — OPV, OPVR, SO, and VOSMS — what amount they’re based on, the minimum, the payment deadline, and what to do in a month with no income.

What state support a new IP in Almaty can get in 2026: a 400 MCI grant for equipment and tools, Bastau Business training, subsidized loans, and Damu Fund guarantees — who qualifies and where to check the terms.

How to take payment for repairs in 2026: the register and fiscal receipt for cash, card, and QR; Kaspi Kassa; transfers from companies to the IP account; the 1,000 MCI rule; and why payment to a personal card is a risk.

How to document a repair for a private customer: work order, estimate and approval for extra work, act and receipt, warranty; the customer’s rights when there’s a defect, with 10 days to fix it and a penalty of 1% a day.

How to work with fleets, companies, and IPs: contract, certificate of completed work (act), ESF (required for simplified-regime businesses too since 2026), reconciliation statement; when to issue an ESF and when a receipt; and why your regime matters to a client on the general regime.

Whose part goes into the car, yours or the customer’s; when selling parts becomes trade; which documents to get from a supplier; why the whole part price counts as income; what the Virtual Warehouse is; and how to track stock.

How to hire your first employee in 2026: the employment contract and ESUTD, what’s withheld from pay and what the IP pays on top, what an employee costs, Form 200.00, safety briefings, workplace safety, and accident insurance.

Whether a shop needs a license, what the sanitary rules require, which Fire Safety Rules apply to the bay (instructions, responsible person, briefing, rags, work clothes, flammable liquids), a shop’s environmental category, and where used oil, batteries, and tires should go.

How the KGD audits an IP in 2026: desk audits and notices in your account, what to do with a notice, what happens if you don’t file a return or pay tax on time, how many years back past periods can be audited, and which fines for small businesses are confirmed by sources.

What to file when your regime or IP information changes in 2026: the regime notice for the move to the new code; a change of address, type of work, or last name; moving to OUR by choice or because you must; VAT registration — where to file and by when.

How an “abandoned” IP differs from a closed one, what’s known about suspension under the 2026 code, and how to close an IP step by step: past reports, employees, register and account, liquidation Form 910.00, payment, and the termination application. At the end: the course’s final test.

Which documents and records a sole proprietor (IP) on the simplified regime keeps, when full accounting books are required, what to keep records in, and why this course is only for your own IP.

When a simplified-regime IP pays for themselves and their employees, when to file Form 910.00 and pay its tax, when to file Form 200.00, and what happens if you miss a deadline.

Which money counts as a shop’s income for Form 910.00 — cash, card, QR, transfers from companies and to a personal card; how to handle refunds and prepayments; and why the register must match the return.

Where an IP files returns and notices, how to work in the taxpayer account with your own EDS, why to read tax office messages, and how to spot debt or an overpayment in your personal account.

How much a simplified-regime IP pays for themselves in 2026 — OPV, OPVR, SO, and VOSMS — what amount they’re based on, how to pay without a code mistake, and how these payments end up on Form 910.00.

How to fill out and file Form 910.00 for a half-year step by step: what’s on it, where the income comes from, how the tax is figured, what to check before signing with your EDS, and which type of return to choose.

When to pay the Form 910.00 tax, how to make sure it’s been credited, what to do with an overpayment, how late-payment interest is calculated, and what an unpaid debt can lead to.

How to fix a mistake or missed income on Form 910.00 with an amended return, what to do about a zero return generated by the system, and how to respond to a desk-audit (cameral control) notice.

Which documents a repair shop prepares for every job and purchase, what to check on an act and a receipt, and how to file source documents by month.

How a simplified-regime IP works with electronic invoices: when an ESF is needed, how to fill it in from the act, what to check in suppliers’ incoming ESFs, and how to reconcile your ESF register with acts and payments.

What the Virtual Warehouse is and what’s on its list from 2026, why the product code decides rather than the name, when selling such goods needs an ESF, and how to record their receipt and issue.

How to figure a shop employee’s pay every month: withholdings, IPN and deductions, take-home pay, the IP’s payments on top and base limits, the payroll sheet and deadlines; what about vacation pay, sick pay, and civil-law contracts, and why pay “in an envelope” is a risk.

How a simplified-regime IP with employees prepares the quarterly Form 200.00: who files it, where the amounts come from, how to check them against payments, 2026 deadlines, and common mistakes.

How to close a half-year with no surprises: a reconciliation statement with a fleet, register — bank — Form 910.00, checking for debt in your personal account, a document archive, and typical IP mistakes. At the end, a final test for the course.