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Alternator & Starter Performance Check in Hillsboro, OR

Output and draw testing that pinpoints whether it's your battery, alternator, or starter.

Diesel Specialists · Gas & Diesel · 1-Yr/12,000-Mi Warranty · Family-Owned Since 2012 · No Upsells
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Frequently Asked Questions

How do I know if it’s the battery or the alternator?

Jump-start the vehicle. If it runs fine after the jump but dies again within an hour of driving, the alternator isn’t recharging the battery — that’s an alternator issue. If it won’t crank at all even with a jump, the starter or a deeper electrical issue is likely involved. We test both.

What voltage should my alternator put out?

13.8—14.5V at idle with accessories off. Under 13.5V means it’s not keeping the battery charged. Over 15V means it’s overcharging and damaging the battery. Both need attention.

My truck clicks when I turn the key. Is that the starter?

One solid click usually means the solenoid is engaging but the starter motor isn’t turning — starter fault. Rapid clicking usually means the battery doesn’t have enough voltage to engage the solenoid properly — could be battery, terminals, or cables. We’ll trace which one.

How long do alternators last?

Most last 80,000–150,000 miles or 7–10 years under normal conditions. High electrical loads (winches, upfitter lighting, heavy accessory use) can shorten that significantly.

Do you service all makes and models?

Yes — gas and diesel, trucks and daily drivers. Hillsboro, Beaverton, and Portland metro.

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