24-volt starting and charging
Heavy trucks, ag equipment and larger commercial units run 24-volt systems that most general shops are not equipped to test. Ours has been painted on the side of the building since the nineties.
Hidalgo County, Texas
Sullivan City is about twenty five minutes west on US-83. People make that drive for electrical work, because shops that can trace a fault properly are not thick on the ground out here.

You are the farthest town we regularly serve, so a wasted trip costs you an hour. Call before you do anything.
Call first, then come. Two minutes on the phone tells you whether we can get to it today and what to bring, which beats a fifty minute round trip for nothing.
Ask about a service call. Twenty five minutes each way is what the call-out covers, and for many no-start faults it still beats a tow plus a repair bill.
Tell us what they did and what they replaced. That is genuinely useful, it narrows the search, and it is the most common reason somebody drives here from Sullivan City.
The ground out this way is agricultural and the vehicle mix runs heavier than average: ranch trucks, ag equipment and commercial units rather than commuter cars.
Heavy trucks, ag equipment and larger commercial units run 24-volt systems that most general shops are not equipped to test. Ours has been painted on the side of the building since the nineties.
Parasitic drains, intermittent shorts and bad grounds. We work the circuit with a wiring diagram and a meter rather than replacing parts in order of price.
A cab that bakes for ten hours is not a comfort issue, it is a safety issue. Leaks, compressor clutches, blower motors and the control circuits behind them.
Inverters, work lights, PTO controls and liftgates. The chassis was never designed around them, and that is usually where the fault is.
Fifty minutes round trip is too much to gamble. Call (956) 487-2143, describe what the vehicle is doing, and we will tell you whether we can look at it that day, what to bring, and roughly what it will take.
Service calls
A dead battery or a starter that will not turn means the vehicle is not going anywhere. We run mobile service calls out to where you are, so you are not paying for a tow just to find out what is wrong.
From Sullivan City that is about 25 minutes of our time each way, which is what the call-out covers.
You will know the call-out charge before we leave the shop. It depends on how far out you are and what the vehicle needs, so we quote it on the phone rather than pretending there is one price for everybody.
Asking costs nothing and commits you to nothing. Tell us what the vehicle is doing, and if a tow or driving it in would work out cheaper for your situation, we will say so.
Call (956) 487-2143The same work we do for every town on US-83.
Rio Auto Electric is about twenty five minutes west on US-83 in Rio Grande City. We test and repair 12-volt and 24-volt starting and charging systems, which covers most heavy trucks, ag equipment and commercial units.
Yes. Our service area follows US-83 rather than the county line, and Sullivan City sits about a mile east of the Starr County line, so you are barely outside the county to begin with.
Yes, we run service calls. It is twenty five minutes each way, which is what the call-out charge covers on top of the repair. Call and we will quote it before we leave, and if a tow genuinely works out cheaper we will say so.
Often, and it is the most common reason people drive here from that far out. A code or a symptom names a circuit, not a broken part. We trace the circuit with a wiring diagram and a voltage drop test until the fault shows itself, rather than replacing components one at a time.

That is usually when people call us. Tell us what the vehicle is doing and we will tell you straight whether we can help.