does this work on a 12 V 8D diesel truck battery?

This will work on all batteries 12 volts and less A carbon pile tester would be a better choice for the larger 8D battery

As this tester puts a 130 Amp load on the battery being tested, is that too much load for testing small batteries such as motorcycle & lawn tractors?

Hi R.W., this tester will certainly tell you if smaller batteries are in good shape but it is kind of over kill as it works by resistance testing. Kind of like plugging a toaster onto your battery. It will draw a lot of juice off the battery in just one test with smaller batteries so if they are weak you will know it fast and they will likely need a recharge afterward. I use it for 4 and 8 D size batteries for starting large diesel engines. I would suggest a lighter amp load tester for what you are doing. Something around a 50 amp range.Hope this helps.Paulpaulmgriswold@aol.com

So this would tell you if a car battery is working properly Etc?

It puts a load,like you're trying to start your car,on the battery, and will tell you if the battery is bad. Most batteries last 5 to 6 years cheaper ones less so if it's old just buy a new one But if it's newer you might want to check it before buying a new one. The battery has to be charged though, you cannot check a dead battery , so unless you have access to a battery charger this won't help you.

will this work on 8 volt golf cart batteries?

Hi Cabo, It might as it has scales for 6 or 12 volt. It would read a little high on the 6 volt scale when checking 8 volt. I can't promise it will work though.

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NT$11327

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Description

🔧 Power up your diagnostics with speed and precision!

SMART STORAGE DESIGN - Side tabs and back brackets let you store clamps and the tester neatly on your tool wall or toolbox—stay organized and ready.
RAPID PRECISION TESTING - Get reliable battery health insights in just 10 seconds—no more guessing games.
HEAVY DUTY CLAMPS WITH GRIP - Uniquely designed clamps ensure a secure hold on both top and side post batteries for flawless testing.
LARGE ZERO ADJUSTABLE DISPLAY - Easily read results on an extra-large screen with zero adjust for ultimate accuracy.
VERSATILE BATTERY COMPATIBILITY - Works seamlessly with both 6V and 12V batteries—perfect for all your automotive needs.

The OTC 3181 is a rugged, ergonomically designed battery load tester delivering fast, accurate results in 10 seconds. Featuring heavy-duty clamps for secure grip on top and side post batteries, a large zero-adjustable display, and compatibility with both 6V and 12V batteries, it’s engineered for professional-grade automotive diagnostics. Its smart storage tabs keep your workspace tidy, making it a must-have tool for any serious garage or workshop.

Specifications

ASIN	B000O3U2UQ
Best Sellers Rank	#43,198 in Automotive ( See Top 100 in Automotive ) #69 in Automotive Battery Testers
Brand Name	OTC
Color	black / black
Customer Reviews	4.6 4.6 out of 5 stars (714)
Global Trade Identification Number	00731413417566
Included Components	Amp Heavy-Duty Battery Load Tester
Item Dimensions	22.9 x 27.9 x 10.7 centimeters
Item Weight	1.38 Grams
Manufacturer	Sunpro
Measurement Type	Ammeter
Minimum Operating Voltage	6 Volts (DC)
Model	3181
Power Source	Battery Powered
Specification Met	CE, RoHS, UL
Style Name	Fashionable and functional
UPC	731413417566
Unit Count	1 Count

Reviews

M**L

Exelente producto

20.03.2025

L**E

I love this tool. It reliable, easy to use, has a heavy duty coil, good clamps and its a sure way to tell it that battery still has it in it. I think it's a must have an any garage.

16.02.2026

M**O

Does what it's supposed to do.

7.08.2024

D**E

It checks the batteries as it should and I personally like the analog better than the digital.

19.01.2020

J**E

Llego en tiempo y forma, se ve resistente. Falta probarlo

10.03.2022

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