Electrical Diagnostics, Repair & Wiring
Fault Tracing, Accessory Wiring & Harness Service for Off-Road and Daily-Driven Vehicles
MST Motorsports provides electrical diagnostics, repair, and wiring service for cars, SUVs, trucks and UTVs. Electrical problems are some of the most frustrating issues to deal with — intermittent faults, parasitic drains, aftermarket wiring that causes problems months after installation, and sensor failures that put vehicles into limp mode or prevent them from starting altogether.
Our technicians have the diagnostic tools and experience to trace electrical faults methodically, identify the root cause, and repair it properly. We also install and wire aftermarket accessories — lights, winches, switch panels, communication systems — with clean, reliable wiring that won't cause problems down the road.
Electrical Diagnostics
Modern vehicles — whether they're powersports machines, trucks, or SUVs — rely heavily on electronic control systems. Engine management, transmission control, stability systems, lighting, and accessories all depend on clean power, solid grounds, and intact wiring. When something goes wrong in these systems, the symptoms can range from a check engine light and reduced power to a complete no-start condition, and the sound the vehicle makes when you turn the key narrows down which part of the starting and charging circuit is at fault.
We use scan tools, multimeters, and circuit testing equipment to trace faults to their source. We diagnose the circuit, verify the fault, and then repair it — which matters most on intermittent problems. A stored code names a circuit rather than a failed part, which is why a check engine light needs a diagnosis and not just a code read.
Accessory Wiring & Correction
We see vehicles — especially UTVs and off-road trucks — that come in with electrical problems caused by poorly installed aftermarket accessories. Spliced wires, improper fuse sizing, missing relays, and bad grounds create circuits that work intermittently, drain batteries, overheat wiring, or fail completely when they're needed most.
We install accessories correctly from the start, and we also fix wiring that was done wrong by someone else. Proper accessory installation includes appropriately sized wiring, correct fusing, dedicated relay circuits where needed, clean connector terminations, and proper routing to protect wires from heat, abrasion, and water intrusion.
Charging & Starting Systems
Diagnostics & Repair
- • Battery testing and replacement
- • Alternator output testing and service
- • Starter motor diagnostics and repair
- • Parasitic draw testing
- • Ground circuit inspection and repair
Lighting & Switches
- • LED light bar installation and wiring
- • Switch panel installation and wiring
- • Relay and fuse panel setup
- • Rock lights and underbody lighting
- • Winch wiring and installation
Off-Road & Powersports Electrical
Desert dust and fine sand are the enemies of electrical reliability. On powersports machines that run Sand Hollow regularly, we see corroded connectors, contaminated sensor harnesses, and dust-packed control modules that cause intermittent faults, limp modes, and no-start conditions. Water crossings at the reservoir compound the problem when moisture reaches connectors that weren't designed for submersion.
We address these issues with connector cleaning and restoration, dielectric grease application, harness rerouting where factory placement is inadequate, and proper sealing of vulnerable connections. Preventative attention to the electrical system is especially important for machines that spend time in Sand Hollow's mixed terrain.
Electrical Services in Washington UT
Battery & Charging System Diagnosis
Load test, state-of-health, and parasitic draw testing to find the actual cause of a dead vehicle.
Alternator Testing & Replacement
Voltage output, diode ripple, and load-under-accessories testing, so the alternator gets replaced when it is the problem.
Wiring Harness Inspection & Repair
Chafed insulation, corroded connectors, and rodent damage traced against a diagram and repaired with solder and heat-shrink.
Accessory & Lighting Install
Light bars, rock lights, ditch lights, switches, communication — wired with relays, proper fuses, and OE-quality connectors.
Fuse & Relay Diagnosis
A blown fuse is a symptom. We find the short or overload behind it and repair that.
UTV Electrical Troubleshooting
Can-Am, Polaris, and Kawasaki fault patterns — dashboard warnings, no-start, ignition kill, and accessory failures.
Accessory Installation
Light bars, switches, winches, communication systems, air compressors, and dual battery setups — wired with proper fusing, relays, weatherproof connectors, and routing that survives dust, water, and vibration at Sand Hollow.
Schedule Your Electrical Service
Electrical gremlins, accessory wiring needs, or a no-start condition? MST Motorsports has the diagnostic tools and experience to find the problem and fix it right. Serving Washington, St George, Hurricane, and Southern Utah.