Battery, Starter & Alternator Service in San Marcos, TX. Free, no-pressure estimates.
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Covering San Marcos, TX & the surrounding Hays County area.
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When your car cranks slowly, the dash lights dim, or you hear a single click instead of the engine turning over, the battery, starter, or alternator is likely failing. You are stuck at home or in a parking lot, needing a diagnosis and repair done where the vehicle sits. This is the situation we handle daily.
We start with a digital battery load test to measure cold cranking amps and state of charge. Then we check alternator output with a multimeter at idle and under load. For the starter, we perform a voltage drop test on the solenoid and main cable, then measure current draw with an inductive clamp. Tools include a load tester, multimeter, and clamp meter.
Battery replacement is straightforward: we match the group size, terminal orientation, and cold cranking amp rating. Starter and alternator jobs vary widely. On some vehicles the part is on top and takes 30 minutes; on others it is tucked behind the intake manifold or under the exhaust, requiring an hour or more. Part choice, new, remanufactured, or OEM, also affects cost and availability.
We arrive with the correct battery, starter, or alternator for your vehicle. We protect your paint and interior with fender covers and floor mats. After the repair, we recycle the old battery and dispose of any old parts. You do not need to do anything beforehand other than confirm the vehicle is parked where we can access it safely.
We use a carbon-pile load tester to measure the battery's ability to hold voltage under a simulated starting load, not just a surface charge reading.
A voltage drop test on the starter circuit finds corroded cables or loose connections that mimic a failed starter, saving you from replacing a good part.

We test the battery's cold cranking amps and charge, measure alternator output at idle and under load, and check starter draw and circuit voltage drops.
We identify the correct group size for the battery and the exact starter or alternator for your make and model, then discuss new, remanufactured, or OEM options.
We disconnect the battery first, then remove the failed starter or alternator, noting any seized bolts or tight access that requires extra time.
We install the new part, torque all fasteners to spec, reconnect the battery, and test the system to confirm proper charging, starting, and no warning lights.

We test the whole charging and starting system, not just the battery. A bad alternator or a corroded ground cable can mimic a dead battery, and we find the real cause.
We match the battery group size, terminal layout, and cold cranking amp rating to your vehicle. For starters and alternators, we verify the exact bolt pattern and electrical connector.
We use fender covers and floor mats to protect your car. We dispose of the old battery and parts properly, and we test the system before we leave so you know it is done right.
Oil Change & General MaintenanceRegular oil changes keep your engine running smoothly and prevent costly damage. We come to you with the correct oil and filter for your vehicle, dispose of the old oil properly, and top off fluids. We'll also do a quick visual inspection of belts, hoses, and fluid levels while we're there.View details
Engine Diagnostics & Check Engine LightWhen that warning light pops on, you need to know what's really going on. We bring professional-grade diagnostic tools to your location and read the codes on the spot. Our approach is to explain the issue clearly and give you options before we turn a single wrench.View details
A/C Repair & RechargeLosing cool air in the Texas heat is more than an inconvenience, it's a safety issue. We test your A/C system's pressure, check for leaks, and recharge with the correct refrigerant. If a component like a compressor or condenser needs replacing, we'll explain the options and get it done on-site.View detailsCall or text us to describe your issue, and we'll schedule a time to come out. We'll diagnose the problem, give you a written estimate, and get you back on the road.