A jump gets you running. The test tells you why it quit.
Anybody with cables can put a charge across a battery. The useful part is the five minutes afterward: measuring what the alternator is putting out, what the battery holds, and whether you are safe to drive home or about to do this again tonight.
- Open 24 hours, seven days
- No hourly minimum
- Charging system tested, not guessed
- Cars, trucks, trailers and fleet
What the vehicle does after the boost tells you everything
A jump start is a diagnostic event, and the information is free if somebody stays long enough to read it. Three patterns cover almost every call, and they point at three completely different repairs.
It starts, then dies again within a mile or two. That is the charging system, almost always the alternator or the belt driving it. The battery was never the problem, it was the thing that ran out while doing the alternator’s job. Drive it far and you will be stranded again somewhere less convenient, usually after dark with the headlights pulling the last of it down.
It starts fine, runs fine, then will not start the next morning. That is the battery holding surface charge but no real capacity, or something drawing current while the vehicle sleeps. A dome light, a glove box lamp, an aftermarket stereo wired to constant power, a bad diode inside the alternator. A parasitic draw test sorts that out in a few minutes.
It cranks, but slowly and heavily, and it does that even with good voltage on the terminals. Now you are looking at the starter drawing too much current, or a bad ground strap between engine and body. Corroded grounds are one of the most misdiagnosed faults in the trade, and a lot of people buy two batteries before anyone checks the cheap thing.
Worth mentioning on the phoneWhether the dash lit up, whether it clicked once or clicked rapidly, whether anything was left on overnight, and how old the battery is if you know.
The figure you hearA price before work starts, no hourly minimum sitting behind it. A boost and a test is a short job and gets billed like one.
Ground we coverBased in American Canyon, working Napa and Solano daily, and out into the East Bay, Marin and Sonoma as calls come in. See where we run.
Why a careless jump can cost more than the tow would have
Older vehicles tolerated sloppy jumping. A modern one does not. There are control modules on the engine, the transmission, the body and the brakes, and they run on regulated low voltage. A reversed clamp, a spike from a badly made connection, or a big alternator on a running donor vehicle dumping into a deeply discharged battery can take out a module that costs more than the battery, the alternator and the visit combined.
Lead placement is the part people get wrong. Positive goes to the positive terminal or the designated jump post, which on a lot of newer vehicles is under a plastic cover in the engine bay rather than on the battery itself, because the battery is in the trunk or under a seat. The negative lead does not go on the dead battery’s negative post. It goes on a bare engine ground or the chassis stud, away from the battery, so that the small spark on connection happens somewhere other than directly over a battery venting hydrogen.
We jump from a proper portable pack rather than by running another engine against yours, which keeps a donor alternator out of the picture entirely. Then the clamps come off in the correct order. It sounds fussy for a two minute job. It is the difference between a boost and a repair bill.
How the call runs from the dead click to driving away
Five steps, and the last two are the ones that separate this from a favor in a parking lot.
- You describe the failureClicking, cranking slowly, or completely dark. Each sound points somewhere different, and it decides what comes off the truck.
- The number, then the driveYou hear what it’ll cost before the truck leaves, including what happens if the battery turns out to be finished.
- The boost, done properlyPortable pack, correct posts, ground away from the battery, clamps removed in order.
- Charging system tested while it runsAlternator output measured at idle and under load with the headlights and blower on. This is where an alternator gives itself away.
- Battery load tested, and a straight answerState of health, cranking capacity, and whether it will survive the week. If it is good, we say so and you keep your money.
We do not charge hourly minimums. A ten minute job is a ten minute job.
Patrick Freeman, owner
Where a jump start call usually leads next
Most of these get done in the same visit, because the parts are already on the truck. Nothing is replaced on a guess.
Battery testing
Load test and state of health, so the decision to replace is a measurement rather than a hunch.
Mobile battery replacement
Fitted where the vehicle sits, terminals cleaned, hold down secured, old battery taken away.
Alternator replacement
The answer when it runs on the boost and dies once the battery is doing the work alone.
Starter replacement
For the single heavy click, or a crank that drags with a healthy battery on the terminals.
Battery cable replacement
Corroded ends and swollen cable look minor and behave exactly like a dead battery.
No start diagnostics
When the electrical side checks out clean and the fault is fuel, spark or a relay.
What people ask when the key does nothing
Not listed here? Call it in. The phone is answered by somebody who can actually diagnose it.
Will a jump start damage my car’s electronics?
Done properly, no. Done carelessly it absolutely can. The risks are a reversed clamp, a spark over a venting battery, and voltage spikes from a running donor vehicle. We use a portable pack rather than another engine, put the negative lead on an engine or chassis ground instead of the battery post, and disconnect in the correct order.
My car started and then died a mile down the road. What happened?
That is the charging system, not the battery. The alternator is not replacing what the engine uses, so the vehicle ran on stored charge until it was gone. Usually it is the alternator itself or the belt driving it. Once we measure output at idle and under load, you will know which before anything is bought.
Do I need a new battery if it needed a jump?
Not necessarily, and we will not sell you one you do not need. A battery flattened by a light left on overnight often recovers completely. A battery that fails a load test or shows poor state of health will not, no matter how long you drive it. The test result decides, and you get told the result either way.
It clicks rapidly when I turn the key. Is that the starter?
Usually not. Rapid clicking is the starter solenoid trying to engage and not getting enough current, which points at a flat battery or a bad connection. One single heavy click with a healthy battery is more likely the starter or its solenoid. The sound is genuinely useful information, so describe it on the phone.
Can you jump a diesel truck or a vehicle with two batteries?
Yes. Heavy trucks and diesels commonly run paired batteries, and getting the right post matters more there than on a car, because the wrong one can damage a solenoid or cook wiring. We work on commercial trucks, trailers and equipment daily and carry gear rated for those loads.
What does a jump start cost?
No figures appear on this page, but you hear yours before the truck leaves, and that includes the testing afterward. There is no hourly minimum, so a short call is billed as a short call. If the test says you need a battery or an alternator, you hear that number separately and decide then.
Dead battery now, answer in twenty minutes.
Tell us where the vehicle is and what the key did. We arrive with a pack, a meter and batteries for the common sizes, so a boost and a replacement can be one visit rather than two.
HoursMonday to Sunday, 24 hours
Based inAmerican Canyon, CA
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