Electrical issues can shut your truck down in seconds. From diagnostics to alternator and wiring repairs, 509 Roadside keeps your systems running safely and reliably. Trust us with all your electrical needs.

Diagnostic and Electrical Repair in Moses Lake, WA
At 509 Roadside, we specialize in full-service diagnostics and electrical repair for trucks, trailers, buses, RVs, and heavy equipment. Whether it’s a faulty sensor or a failing alternator, we’ll pinpoint the problem fast.
Common diagnostic and electrical repairs include:
- Semi truck electrical diagnostics
- Alternator and battery replacement
- Starter motor repair
- Fault code clearing and ECM scanning
- Wiring repair and electrical troubleshooting
What Makes Us Different
509 Roadside isn’t your average diesel shop. We service a wide range of vehicles with the tools and training needed to handle modern diagnostic and electrical issues. Every repair is completed with accuracy and efficiency to minimize downtime.
- In-shop service for trucks, RVs, trailers, buses, and fleets
- Roadside assistance available during business hours
- Honest timelines and transparent estimates
Need us on the road? Our mobile service team can assist during weekdays for breakdowns and scheduled on-site repairs. If you’re stuck and need help, 509 Roadside has you covered with 24/7 roadside assistance.
FAQs
How Can I Get Diagnostic and Electrical Repair?
Call 509-855-4932 to schedule your service. Whether it’s a check engine light or a complete no-start issue, we’ll diagnose and repair your truck’s electrical system fast.
Can Electrical Issues Cause a Truck Not to Start?
Yes. Electrical failures like a bad alternator, weak battery, damaged wiring, or ECM faults can all prevent your truck from starting. It’s critical to address these issues before they leave you stranded.
What Areas Do You Serve For Diagnostic and Electrical Repair?
We’re located at 11969 Debonair Street Northeast, Moses Lake, WA. We also proudly serve Spokane, WA; Kennewick, WA; Pasco, WA; Richland, WA; Yakima, WA; Wenatchee, WA; and Ellensburg, WA.
How Do You Diagnose Electrical Problems in a Truck?
We use advanced diagnostic tools to scan fault codes, test circuits, and isolate problem areas. From faulty sensors to shorted wiring, we systematically narrow down the issue to find the right fix.
Schedule Your Electrical Repair Now: Call 509-855-4932!
If your truck is throwing codes, stalling out, or won’t start, it’s time to get it checked. Call 509-855-4932 now to schedule your truck electrical repair or diagnostic scan today.
What They're
Saying About Us
See why our customers consider 509 Roadside their go-to repair shop in Moses Lake, WA and the surrounding areas!
Joseph helped me out when my car couldn’t shift gears coming from Spokane, going back to Western WA. It was 99 degrees out and he came from his house to help me. He was calm, knowledgeable, communicated well, and honest. He even called me when I got back home to make sure I made it and gave me some car tips. There aren’t too many people out there like him. I believe in karma, and Joseph deserves all the best karma his way.
Came in for an issue, fixed extremely quick. The most honest mechanics ive seen in a long time. Will definitely be coming back for any future issues!
These guys came out and did a roadside repair on my trailer and got me patched up in no time, their mechanic even followed me to my destination to make sure everything went smoothly. They went above and beyond, excellent and professional service. Thanks guys!
My car broke down and Joe found me stranded. He called a tow truck immediately and waited with me, I told him I thought my alternator burned out and he confirmed that was the case as soon as he walked up. He had the car fixed first thing in the morning and his rate was very reasonable. Joseph is a great person and an amazing mechanic. I highly recommend his services.
Joseph did a great job replacing a small engine for us. He searched, bought and replaced it for us while keeping us informed every step of the way. With great pricing and service, we will continue to utilize him in the future for our needs.
They did excellent work on getting my 1995 Tacoma running with multiple vacuum and other issues. Good diagnosis and repair on old projects is hard to find now days. I would recommend these folks to anyone.
Had issue with semi shutting down due to coolant level issue, contacted 509 to assist and they were earlier then expected, very friendly and got me back on the road quickly and went beyond duty and even checked other things to prevent any other issues. Would call them first if I ever have a problem down road.
My window wasn’t working for the past 2 years and I was looking for a good mechanic for a while but they were too pricey. But 509 roadside did not disappoint! They were able to fix my window at a great price! Definitely recommend!! I can finally go through the drive through!
Contact 509 Roadside
Need roadside assistance, have questions, or want to schedule your truck or trailer in for a service or repair? Get in touch!