Truck & Trailer Electrical Repair
From a no-start to a wiring gremlin that's been chasing you for months — heavy-duty electrical work is what we do. Starting, charging, lighting, chassis wiring, and the trailer 7-pin that always seems to be the problem.
What’s included
Everything covered under this service, on-road or in the shop.
- Battery testing, replacement, and bank rebuilds
- Alternator and starter service
- Cable, connector, and harness repair
- Voltage drop testing across circuits
- Trailer 7-pin (RV, J560, ABS power) diagnosis
- Lighting — LED retrofit, halogen, marker, work lights
- Ignition, accessory, and ECM power circuits
- Chassis ground and bonding repair
- ABS wiring and sensor circuit testing
Why fleets and drivers choose T&T
We follow the schematic — not parts darts
Most electrical 'mysteries' come down to a corroded ground or a chafed wire. We trace the circuit, not the parts list.
Grounds before alternators
A weak ground masquerades as a charging problem all the time. We check the simple, cheap stuff first instead of selling you an alternator that wasn't the problem.
Wiring repair done right
Heat-shrink, weather-pack connectors, proper splices. No electrical tape and crossed fingers.
Brands & systems we service
Delco RemyBoschLeece-NevilleOptimaInterstatePhillips IndustriesPollakGroteTruck-Lite
Frequently asked
- My truck won't start — is it the battery, alternator, or starter?
- All three are testable in about 20 minutes with the right load tester. Often it's the batteries, occasionally the starter, sometimes the cables. We'll tell you which it is before we sell a part.
- Can you trace an intermittent electrical fault?
- Yes. Intermittents are slower than hard faults — we'll often need to install a datalogger and run the truck under the conditions that trigger the symptom. Slower process, but it actually finds them.
- Do you do LED lighting upgrades?
- Yes. LED retrofits across markers, work lights, headlamps, and trailer lighting — fleets like the longer life and lower current draw.
- My trailer ABS light won't go off — can you fix that?
- Yes. ABS faults are usually a sensor, a wheel speed signal issue, or a wiring break. We pull the codes from the modulator, trace, and fix. Don't drive a trailer with ABS faults — it's an FMCSA out-of-service condition.
- How long does a wiring repair take?
- A simple known-fault repair (replace a corroded connector): an hour or two. A full trace on an intermittent: a half-day or more. We'll log the time and you'll see what we did.
Get a truck back on the road.
Call us — most customers reach a real person in under 30 seconds.