Electrical
Truck Electrical System Troubleshooting & Repair
Electrical faults are the ones that get parts thrown at them, because the symptom moves and the cause hides. We trace them instead.
The work
Electrical work we do
A no-start gets a battery. The battery does not fix it, so it gets a starter. The starter does not fix it either, and three hundred dollars later somebody finds a corroded ground strap. That sequence is so common it is almost a rule, and it happens because electrical faults are diagnosed by replacement more often than by measurement.
Voltage drop testing, load testing, current draw measurement and pin-level harness checks answer the question properly. On an intermittent fault — the kind that only appears on a hot afternoon, or over a specific stretch of rough road — that discipline is the only thing that works at all.
- Battery, charging and starting system diagnosis
- Alternator and starter testing under load
- Parasitic draw diagnosis on units that die overnight
- Ground and connection faults, corrosion repair
- Harness, connector and pin-level repair
- Lighting, marker and trailer circuit faults
- Sensor circuit and reference-voltage faults
- Intermittent fault tracing with live data
When to call
Typical calls
- A unit that is dead every Monday morning
- A no-start that has already had a battery and a starter
- Lights or gauges behaving inconsistently
- Trailer lighting faults that follow the tractor
- Fault codes that appear and clear with no pattern
Coverage
Engines and makes
Cummins and Detroit Diesel, including Cummins LNG and CNG alternative-fuel systems, across Freightliner, International, Isuzu, Hino, Autocar.
Electrical diagnosis is billed as time rather than parts, and that is usually the cheaper end of the job. The expensive version is the one where the parts get replaced first.
Where we work
Electrical Systems across Greater Los Angeles
We bring this work to your yard across the districts we cover from our Glassell Park base:
Related
Other services
Diesel Engine Repair
Cummins and Detroit Diesel engine work carried out at your yard — diagnosed with OEM software before a single part comes off, by technicians who spent seventeen years doing it inside Freightliner and International dealerships.
Read moreElectronic Diagnostics
Reading a code off a generic scanner tells you a circuit is unhappy. OEM-level diagnostics tell you which part is failing and why — and that difference is usually the whole repair bill.
Read moreDPF & Aftertreatment
A truck that regens constantly is not telling you the filter is full. It is telling you something upstream is putting soot into it faster than it should.
Read moreCNG & LNG Service
Very few shops in Los Angeles will touch a natural-gas heavy-duty engine. If you run CNG or LNG and have been told to take it to a dealer, talk to us first.
Read moreClean Truck Check
A Clean Truck Check failure does not just cost a retest. Compliance is tied to DMV registration — an unresolved failure can stop you registering the unit at all.
Read moreBrake, Air & Suspension
An out-of-service brake defect takes a unit off the board until it is corrected. We carry the components and the tooling to correct it in your yard rather than in a shop queue.
Read moreNeed electrical systems at your yard?
Call dispatch with the yard address, unit number, make and engine, and any fault codes on the dash.
Straight answers