Truck electrical
& lighting repair.

A slow crank, a dead battery, or lights that work only sometimes can interrupt your whole day. Diesel Tech provides commercial truck electrical diagnostics in Richmond, VA, with testing to help identify the fault before recommending repairs.

Replacement truck starter installed with electrical cables connected
A starter replacement from our service work.
Test the system. Trace the fault.

Electrical service
for working trucks.

Describe the symptom and your equipment when you call. We’ll discuss the diagnostic work, service availability, and next steps.

Starting & charging

Starting and charging concerns can involve several components. We check the affected circuit and connections.

  • Battery condition and cable testing
  • Starter and alternator diagnosis
  • Starting and charging-system repairs
  • Key-off electrical draw testing

Wiring & controls

Loose terminals, damaged wiring, and poor grounds can create faults that resemble a failed component.

  • Wiring, connectors, fuses, and relays
  • Power supply and ground checks
  • Switch, sensor, and actuator testing
  • Corrosion and moisture-related concerns

Lighting & diagnostics

We help trace lighting failures and electronic concerns on commercial trucks and trailers.

  • Headlights, signals, and marker lights
  • Brake lights and trailer connections
  • Gauge and warning-light concerns
  • Electronic control and communication faults
Truck & trailer visibility

When a light fails,
check the circuit.

A lamp that goes out repeatedly may need more than another bulb. Power, grounds, connector condition, and moisture can all affect operation. We inspect the affected lighting circuit and discuss the repair needed.

Bring us concerns involving headlights, brake lights, turn signals, clearance lights, and tractor-to-trailer electrical connections. After the repair, we check the affected lights for operation.

Share the pattern. Tell us whether the fault changes with rain, vibration, temperature, trailer connection, or use of another electrical accessory. Photos and videos of an intermittent failure can help.
Diagnostics with clear next steps

Make the repair decision
with useful information.

01 / Understand the symptom

We start with what the truck is doing and when it happens. A warning message or fault code is a starting point for investigation.

02 / Test & explain

Diagnostic checks help narrow down the problem. We discuss findings and recommended work before proceeding with authorized repairs.

03 / Repair & verify

We address the identified issue and check the affected system. Intermittent faults may need additional time or testing while the symptom is present.

From our service work

Starting-system repair.

View our repair gallery ↗
Original truck starter before replacement
Before replacement
The original starter installed on the engine.
Replacement starter motor prepared for installation
Replacement prepared
The new starter ready for installation.
New truck starter installed with connected cables
Installed starter
Replacement fitted with electrical connections in place.
Electrical & lighting FAQs

What drivers often ask.

Why do my batteries keep going dead?

The cause may be battery condition, a charging fault, a poor cable connection, or an electrical load that remains active with the truck off. Testing helps determine which issue needs attention.

Can you investigate an intermittent problem?

Yes. Tell us what happens and under which conditions. A fault that comes and goes may require extra testing time, and it may need to occur during testing before the cause can be confirmed.

Do you repair trailer lighting connections?

We inspect common truck-to-trailer connector, wiring, and lighting concerns. Let us know which lights are affected and whether the problem follows one trailer or occurs with multiple trailers.

Can you help with a roadside no-start?

Call 804-222-7308 with the location and whether the engine cranks. Mobile support depends on the repair, safe access, parts, and technician availability. We’ll discuss the practical next step.

Tell us what your truck is doing.804-222-7308 ↗Request service
Call 804-222-7308Request Service ↗