How do I test the alternator? Hooked up to battery, got a voltage reading, started the car but it doesn't show anything on the alternator side

Leave the tester on the battery, it should read at least 12v, start your car, if the reading didn't go up for at least 14v, you're alternator is not working....

What is the Cigarette lighter adapter for?

to test the battery through the cigarette lighter of the car instead of raising the hood and clamping on the battery.

Will this also work on a 12v marine battery?

Absolutely. It should register around 12.0-12.6 volts when the vehicle it turned off. If it registers a little higher when the vehicle is running, then that means your alternator is working perfectly fine. It’s a great tool to have. It’s good to check your battery every once in a while. It’s worth the money.

Can this tester be used with three batteries wired in parallel?

If the battery voltage in parallel or series exceeds 3V, it can be measured

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🔧 Power Up Your Knowledge with AUTDER!

SAFETY FIRST - Equipped with reverse connection and overvoltage protection for peace of mind.
CONFIDENCE IN QUALITY - Backed by a two-year warranty and 24/7 customer support for your assurance.
VERSATILE APPLICATIONS - Ideal for testing batteries in RVs, motorcycles, and more—perfect for any vehicle enthusiast.
EFFORTLESS CONNECTIVITY - Easily plug into your car's socket for instant battery readings.
PRECISION AT YOUR FINGERTIPS - Enjoy accurate voltage measurements with a precision of ±0.01 volts.

The AUTDER Car Battery Tester is a versatile and user-friendly voltmeter designed for both 12V and 24V systems. With an LCD display for quick readings and LED indicators for status checks, it ensures safety with features like reverse connection and overvoltage protection. Its precision measurement capability of ±0.01 volts makes it perfect for a variety of applications, from cars to motorcycles. Plus, it comes with a two-year warranty and lifetime service for added peace of mind.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Manufacturer	AUTDER
Part number	AD-808
Item Weight	160 g
Product Dimensions	14 x 6.5 x 2 cm; 160 g
Batteries	1 12V batteries required.
Item model number	AD-808
Size	24V 12V
Colour	Black
Style	Modern, Practical, Durable
Power source type	Battery Powered
Item Package Quantity	1
Measurement Accuracy	+/- 1
Specification met	CE
Included components	Battery Tester
Batteries included?	No
Batteries Required?	Yes
Battery Cell Type	Lithium Ion

AUTDER Car Battery Tester, 12V/24V Voltmeter for Car & Motorbike Battery, Alternator Charging System Analyzer with LCD Display & LED Indicators, Dual Testing Modes

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