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New battery, new starter, still won't start: what testing found on a Sprinter that sat for three months
Reviewed by Kasey, owner — NASTF-credentialed for manufacturer secure systems · repair completed August 24, 2026 · Ormond Beach, FL
The complaint
The van ran fine when it was parked. Three months later it was dead. The owner replaced a battery, and the engine wouldn't crank at all. Then the owner replaced the starter, and it cranked but wouldn't start. At that point it came to us on a tow truck.
That is a completely reasonable sequence of guesses. It is also how a no-start turns into a pile of parts.
What we tested
The starter circuit first.
The new starter was getting proper battery voltage and a strong start signal. So the starter was being told to work, with the power to do it.
What the engine actually did.
It cranked extremely slowly, once, and then would not crank again.
Whether the engine could turn at all.
Rotating the engine by hand, it was extremely difficult to turn. That is the point where a lot of people start worrying about the engine itself.
One more step before condemning anything.
We took the accessory drive belt off. With the belt off, the engine turned freely.
What we found
The alternator was seized.
It would not spin. With the belt on, the starter was trying to turn the engine against a locked alternator — which is why it cranked once, slowly, and quit.
There are two batteries on this van, and only one had been replaced.
The owner had replaced the one under the driver's footwell. The second battery, under the passenger seat, was in very poor condition.
Nothing was wrong inside the engine.
What it took
New alternator and both drive belts.
The second battery, under the passenger seat, replaced.
We also noted that the replacement starter may have been strained by cranking against a seized alternator, and offered to replace it. The owner declined that, which was their call to make.
Outcome: completed August 24, 2026.
What it costs depends on what testing finds. A no-start is a symptom with a dozen possible causes, and the first two guesses here were both wrong. We won't quote it sight-unseen. We offer a written 3-year/36,000-mile warranty. Ask us for complete coverage terms.
What to watch for on your own Sprinter
Many Sprinters have two batteries. If one has died from sitting, test the other before you buy anything else.
An engine that cranks once, slowly, and stops is not always a battery or a starter. Something the belt drives can be locked up.
If the vehicle is going to sit for months, a battery maintainer is cheaper than any of this.
If yours won't start, call 386-677-1818 or book online before replacing the next part. More: battery, starting and charging repair · Sprinter service and repair.
Visit us
Lonnie's Automotive · 60 N Yonge St, Ormond Beach, FL 32174 · 386-677-1818 Monday–Friday, 8:00 AM–5:00 PM ·