Auto Electrical Guides

o3 / AI Assistant

02/07/25, 14:04

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Auto Electrical Guides

Scope of Works

Plug diagnostic scanner into OBD port; read and interpret fault codes.
Perform live-data tests on alternator, battery, starter draw and CAN-bus voltages.
Trace wiring looms with multimeter, locate shorts, high-resistance joints or blown fusible links.
Repair or replace faulty components (relays, sensors, alternator, battery, earth straps) using manufacturer-approved parts.
Reset fault codes, update ECU software where required, and road-test to confirm repair.
Provide print-out of diagnostics, warranty details and maintenance advice.

Typical Cost (inc. VAT)

Charge type	Low £	High £	Notes
Call-out / minimum (mobile or first hour in workshop)	60	110	Includes initial code scan
Labour per hour (after minimum)	45	75	Specialist rate for auto-electrics
Materials (fuses, wiring, sensors, alternator)	15	350	Battery £90–£160; alternator £200–£350
Disposal (battery recycling)	0	15	Lead-acid environmental fee
Extras (complex CAN fault-finding, ECU reflashing)	0	200	Only if required
TOTAL (most jobs come in here)	180	550	Code scan + part replacement

Time on Site

30 min – 1 h for basic diagnostic & fuse swap. Up to 3 h if alternator/starter removal, loom repair, or ECU update is needed. Extra time for vehicles with limited engine-bay access or seized fixings.

Questions to Ask Your Tradie

Are you IMI-qualified or ATA-registered for auto-electrical work?
Will you provide a print-out of fault codes and live-data before replacing parts?
Are manufacturer-specific diagnostic tools used for my make/model?
What warranty covers replacement parts and your workmanship?
Is battery programming (BMS reset) included if a new battery is fitted?
How do you price additional hours if unexpected wiring faults are found?
Will you recycle the old battery or alternator in an environmentally compliant way?

How to Avoid Surprises

Access & Parking: Ensure off-street space for service van or arrange visitor permit.
Battery State: Charge a flat battery overnight so accurate tests can be run immediately.
Security Codes: Have radio/nav security PINs ready in case power is disconnected.
Previous Mods: Tell the electrician about any aftermarket alarms, stereos or dash-cams—they often cause parasitic drains.
Service History: Bring past diagnostic reports to avoid repeat investigations.
Payment: Confirm accepted methods and if diagnostic fee is credited against repair work.