Heavy Equipment Diagnostics and Electrical Repair in Midland, TX

Electrical troubleshooting and control system diagnostics for heavy equipment at Chris’s Diesel Service in Midland. Sensor and harness repair, starting and charging systems, and diagnostics for the electronics that run modern dozers, excavators, loaders, and telehandlers. Faults traced with live data to the actual failure, not solved with a parts cannon.

Call (432) 557-6500
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Livedata
Diagnosis by Evidence
Dealer
Official Continental Batteries
Zero
Comebacks in 2025
What You Notice → What It Usually Is

Electrical Gremlins Have Addresses.

Machines working dusty locations from Midland to Odessa fail in ways that repeat. These are the complaints that come through the door, and where testing usually finds the fault.

Cranks slow or will not start
Likely Path Battery condition, cable and ground corrosion, starter draw, or a safety interlock refusing the start. We load-test the batteries and measure voltage drop through the circuit before anyone buys a starter. As an official Continental Batteries dealer, the honest fix is often on our shelf.
Random fault codes, machine derates
Likely Path Chafed harnesses, corroded connectors, or a sensor drifting out of range. West Texas dust, heat, and vibration eat wiring. We trace the circuit with live data and a wiring diagram, because a code names the circuit, not the component.
Gauges or monitor panel acting up
Likely Path Sender failures, ground problems, or data bus faults between controllers. Intermittent gauge behavior is almost always a connection, not the gauge. We test the signal path end to end before replacing displays.
Battery dies overnight
Likely Path Parasitic draw from a stuck relay, aftermarket add-on, or controller that never sleeps. We measure the draw, pull circuits one at a time, and find the one that is feeding on the battery. Replacing the battery alone just schedules the next no-start.
Charging warning or dim lights at idle
Likely Path Alternator output, belt and pulley condition, or resistance in the charging cables. Output gets measured under load at the battery, not just at the alternator post, because the wire between the two is a common failure.
Hydraulic or drive functions dead, no mechanical cause
Likely Path Solenoid coils, interlock switches, joystick and controller signals, or a harness break between them. Electrical faults masquerading as hydraulic failures waste more parts money than any other category. We separate the two with testing before anything is replaced, and the mechanical side goes to hydraulic system repair only once testing points there.
Lift machine locks out or refuses to boom up
Likely Path Load moment sensors, angle and length sensors, or wiring feeding bad data to the safety controller. On telehandlers and other lift equipment we diagnose the sensor chain and repair the fault. We never bypass a safety system to get a machine running.
How It Works

No Parts Cannon. Ever.

Electrical work is where dishonest diagnosis hides easiest. Our answer is a process that shows its evidence.

  1. 01

    Reproduce and Record

    The fault gets reproduced and captured in live data. Intermittent problems get monitored until they show themselves. A fault we have seen is a fault we can fix.

  2. 02

    Trace to the Failure

    Wiring diagrams, voltage drop testing, and pin-level checks narrow the circuit to the failed component or connection. You get an itemized quote for exactly that repair.

  3. 03

    Repair and Prove It

    Harnesses repaired with sealed connections built for dust and vibration, components replaced with OEM standard parts, and the fix verified through full operation. Chris signs off before the machine leaves.

Technician routing and inspecting electrical cabling along a heavy duty frame rail
Standards and Capability

Modern Iron Runs on Electronics.

A current-generation excavator carries more controllers than a car. Shops that cannot diagnose electronics end up guessing with your parts budget. We invested in the tooling and the discipline instead, and it backs every job that comes through heavy equipment repair.

  • Live Data Diagnostics Controller data, sensor readings, and actuator tests read in real time on modern equipment control systems.
  • Harness Repair Done Right Sealed splices, correct terminals, and looms routed away from heat and rub points. No twist-and-tape repairs that die in a month.
  • Battery Authority Official Continental Batteries dealer with load testing on every electrical job. The right battery, tested cables, and clean grounds solve half the electrical complaints in the Basin.
  • Field Diagnostics No-start machines rarely need a haul to find the cause, so electrical faults can be traced at your location through mobile heavy equipment repair.
  • Records for Fleets Diagnostic findings and repairs documented per machine, which folds into a fleet services maintenance history when you run more than a few units.
Diagnostics FAQ

Common Questions

Can you diagnose electronics on newer heavy equipment?
Yes. Modern dozers, excavators, loaders, and telehandlers run networked controllers, and we diagnose them with live data rather than guesswork. We read sensor values, run actuator tests, and trace faults to the failed circuit before quoting the repair.
Which equipment brands do you diagnose?
Our team diagnoses electrical and control system faults on CAT, John Deere, Komatsu, Case, Volvo, Bobcat, and JLG equipment. Control architectures differ between manufacturers, but the method does not: read live data, test power and ground distribution, then trace the circuit to the failure. Call (432) 557-6500 with the make, model, and what the machine is doing.
My machine throws different codes every week. Why?
Rotating codes across unrelated systems usually point to a common cause: a failing ground, a chafed main harness, or supply voltage problems feeding multiple controllers. Chasing each code individually wastes money. We test power and ground distribution first, because one bad connection can imitate five failures.
Do you fix wiring harnesses or just replace them?
We repair them properly where repair makes sense: sealed splices, correct terminals, and protective loom, built for dust and vibration. Full replacement is quoted when damage is beyond honest repair. Either way the circuit is tested end to end before the machine is released.
Do you repair starters and alternators on heavy equipment?
Yes, and we test the circuit before condemning the component. A slow crank is often cables, grounds, or an interlock rather than the starter itself, and a charging warning is often resistance in the cables rather than the alternator. When a component has genuinely failed we replace it and measure output under load at the battery to confirm the whole circuit is healthy.
Why does my equipment battery keep dying?
Either the battery is failing, the charging system is not keeping up, or something is draining it while parked. We load-test the battery, measure charging output under load, and hunt parasitic draws until the actual cause is found. As a Continental Batteries dealer, we fit the right battery when that is the fix.
What does equipment electrical diagnosis cost in Midland, TX?
Diagnostic time is quoted upfront, and it is the cheapest money on the invoice because it prevents parts roulette. After the fault is traced you get an itemized written estimate for the repair itself. Call (432) 557-6500 and describe what the machine is doing.

Codes, Gremlins, or a Dead Machine?

Stop feeding it parts. Get the circuit traced with live data, the actual failure repaired, and the fix proven before release.

Call (432) 557-6500
Request a Service Estimate
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Electrical faults love to imitate mechanical ones. Same shop covers both sides.

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