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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Description

⚡ Test smarter, not harder — power up your garage game!

VERSATILE CLAMP DESIGN - Unique clamps ensure a rock-solid grip on both top and side post batteries for flawless testing.
SMART STORAGE SOLUTIONS - Built-in side tabs and back brackets let you stow your tester neatly on your toolbox or wall—no clutter, no hassle.
POWERFUL 130 AMP LOAD TESTING - Delivers industry-leading heavy-duty battery diagnostics with precision.
EXTRA LARGE EASY READ DISPLAY - Zero-adjustable 0-16V range screen keeps you informed at a glance, even in dim garages.
LIGHTNING FAST 10 SECOND RESULTS - Get reliable battery health insights in the time it takes to grab your coffee.

The OTC 3181 is a rugged, ergonomically designed 130-amp battery load tester that delivers fast, accurate diagnostics for 6V and 12V batteries. Featuring uniquely engineered clamps for secure contact, a large zero-adjustable display, and convenient storage options, it’s the essential tool for any professional or enthusiast aiming to keep vehicle batteries in peak condition.

Specifications

ASIN	B000O3U2UQ
Best Sellers Rank	615,778 in Automotive ( See Top 100 in Automotive ) 616 in Car Battery Testers
Brand	OTC
Colour	Black, Red
Customer Reviews	4.6 out of 5 stars 718 Reviews
Global Trade Identification Number	00731413417566
Item Dimensions	22.9 x 27.9 x 10.7 centimetres
Item Weight	1.38 Grams
Item dimensions L x W x H	22.9 x 27.9 x 10.7 centimetres
Item weight	1.38 Grams
Manufacturer	Sunpro
Manufacturer Part Number	3181
Measurement Type	Ammeter
Minimum Operating Voltage	6 Volts (DC)
Model Number	3181
Power Source	Battery Powered
Power source	Battery Powered
Product Warranty	Repair Only
Specification Met	CE, RoHS, UL
Style	Tool
Style Name	Tool
UPC	731413417566
Unit Count	1.0 count

Reviews

M**L

Exelente para lo que lo uso

20.03.2025

L**E

A Great Tool

16.02.2026

M**O

Great product

7.08.2024

D**E

Great for the Price

19.01.2020

J**E

Lo rometido

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

10.03.2022

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OTC 3181 130 Amp Heavy-Duty Battery Load Tester Black

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