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Q: 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

Q: 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

Q: 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.

Q: 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 battery game in 10 seconds!

VERSATILE CLAMP DESIGN - Uniquely engineered clamps ensure a rock-solid grip on both top and side post batteries.
SMART STORAGE SOLUTIONS - Built-in side tabs and back brackets keep your tester organized on-tool, wall, or toolbox.
POWERFUL 130 AMP LOAD TESTING - Delivers industry-leading heavy-duty battery diagnostics with precision.
EXTRA LARGE EASY READ DISPLAY - Zero-adjustable 0-16 volt range screen for quick, no-fuss readings every time.
LIGHTNING FAST 10 SECOND RESULTS - Get reliable battery health insights in the time it takes to grab your coffee.

The OTC 3181 is a robust, ergonomically designed 130-amp battery load tester that delivers fast, accurate diagnostics for 6V and 12V batteries. Featuring uniquely designed clamps for secure grip, an extra-large zero-adjustable display, and smart storage options, it’s the essential tool for professionals demanding reliable battery health checks with minimal downtime.

Specifications

Brand	OTC
Power Source	Battery Powered
Style	Tool
Color	Black
Item Weight	1.38 Grams
Item dimensions L x W x H	9 x 11 x 4.2 inches
Min. Operating Voltage	6 Volts (DC)
Measurement Type	Ammeter
UPC	731413417566
Manufacturer	Sunpro
Global Trade Identification Number	00731413417566
Item Weight	0.049 ounces
Product Dimensions	9 x 11 x 4.2 inches
Item model number	3181
Is Discontinued By Manufacturer	No
Manufacturer Part Number	3181