I was chasing a dead taillight on my truck and needed a fast way to check for current without guessing. That’s when I grabbed the Feikenee Test Light Automotive, 6-24V DC Voltage Tester—it handles 6 to 24 volts DC and has a 39-inch wire with an alligator clip for grounding.

This tester is really for DIYers and car owners who want a simple, no-nonsense way to check fuses, switches, and wires. The long steel probe pierces insulation easily, but the brightness varies with voltage so you won’t get a precise reading—just a clear yes/no on power flow. Keep reading to see how it held up in my garage.

What Stands Out — Key Features

• 6-24V DC Range: I tested it on my truck’s 12V system and my RV’s 24V lights—both lit up clearly. It covers most automotive needs without extra fuss.
• 39-Inch Wire with Alligator Clip: That long cord let me reach across the engine bay easily. The clip grips bare metal or chassis components firmly for a solid ground.
• Long Steel Probe: I used the sharp probe to pierce wire insulation on a stubborn fuse box—no stripping required. It’s reinforced steel, so it feels sturdy in hand.
• Brightness Varies with Voltage: The handle glows brighter at higher voltages—I could tell roughly if I had 6V or 12V just by the light intensity. Handy for a quick check.
• Compact Size: At only 8.3 inches long, it fits in my glovebox or tool pouch without taking up space. I keep it in my truck for roadside checks.
• Battery Powered: No need to plug into a wall—the tester runs on its own battery, so it’s ready to go whenever I pop the hood. Simple and reliable.
• Wide Application: It works on cars, trucks, SUVs, and RVs with 6-24V DC systems. I even used it on a boat’s electrical panel—no issues at all.

Full Specifications

Pros & Cons — The Honest Take

For a simple, affordable circuit tester that does exactly what it promises, the pros far outweigh the cons—I just wish it offered a more precise voltage readout instead of relying on brightness alone.

⚖️ How Does It Compare?

I compared the Feikenee test light to two other popular options I’ve used in my garage. The VDIAGTOOL P60 and JASTIND Automotive Test Light both offer different strengths for electrical troubleshooting.

If you need exact voltage numbers and work on higher-voltage gear up to 70V, grab the VDIAGTOOL P60. But for most car and RV owners working with 6-24V systems, the Feikenee’s compact size and wider voltage range make it the smarter everyday choice over the 12V-limited JASTIND.

How It Actually Performs

Ease of Use and Setup

I unboxed the Feikenee tester and had it working in under 30 seconds—no instructions needed. The alligator clip grabs any clean metal surface on my truck’s chassis, and the 39-inch wire gave me enough slack to reach the tail light Use without stretching. I just touched the long steel probe to a terminal, and the handle lit up immediately. The brightness varied clearly between my 12V car battery and a 6V motorcycle fuse, so the voltage indication worked as promised.

Probe Durability and Build Quality

The probe is made of reinforced steel, and after poking through wire insulation on three different fuse boxes, the tip still looks sharp and straight. I accidentally dropped it onto my concrete garage floor from about four feet up, and the AS plastic handle didn’t crack or loosen. At only 8.47 x 3 x 1.26 inches, the whole unit feels solid in my hand without being heavy. However, the alligator clip’s teeth are small—I had to reposition it twice on a thick rusty bolt to get a good ground connection.

Voltage Detection Accuracy

The tester lights up across its full 6-24V DC range, and I confirmed that with a multimeter on my 12V car battery and 24V RV system. The brightness definitely increases with voltage, but it’s not a precise measurement—I couldn’t reliably tell if I was looking at 12.4V or 12.6V. For a quick check of whether a wire or fuse has power, it’s perfect. For diagnosing a parasitic drain or exact voltage drop, I’d still grab my multimeter. The handle glowed consistently every time I touched a live terminal, with no flickering or false readings.

Storage and Portability

At just 8.3 inches long, this tester disappears into my truck’s glovebox alongside my tire gauge and owner’s manual. I’ve also tossed it into my RV’s tool drawer and my garage toolbox without it taking up space. The wire wraps neatly around the probe for storage, though there’s no clip or holder to keep it coiled—I just loop it around my fingers before tucking it away. For a tool that costs less than a fast-food lunch, the portability makes it easy to bring on every road trip without thinking twice.

Who Is This Circuit Tester Best For?

After spending a few weeks with the Feikenee test light in my garage and on the road, I’ve got a clear picture of who will love it and who should pass. Here’s how I’d break it down based on what I saw.

✅ This Is a Great Fit If You…

• Own a car, truck, SUV, or RV with a 6-24V DC system and want a quick way to check fuses and wires without dragging out a multimeter.
• Are a DIY enthusiast who works on your own vehicle at home and needs a compact tool that fits in your glovebox at just 8.3 inches long.
• Need to pierce wire insulation to test for power—the long steel probe handled that job easily on my fuse box without stripping wires.
• Want a simple, battery-powered tester that lights up when current flows, with brightness varying by voltage so you get a rough idea of power level.

❌ You Might Want to Look Elsewhere If…

• Need precise voltage readings—the Feikenee only shows brightness, not exact numbers, so you won’t know if you’re at 12.4V or 12.6V.
• Work on household AC circuits or systems above 24V DC—this tester is strictly for DC and tops out at 24 volts.
• Prefer a digital display or want to test for continuity rather than just voltage presence—this is a basic light, not a full diagnostic tool.

For the average car owner or weekend mechanic who just needs to confirm power is flowing through a wire or fuse, the Feikenee Test Light Automotive, 6-24V DC Voltage Tester is my top pick for a simple, affordable solution that lives in your glovebox.

Common Issues & Fixes

After using the Feikenee test light on a handful of vehicles, I ran into a few hiccups that are easy to work around. Here’s what I learned so you don’t waste time guessing.

No Light When Touching a Terminal

The problem: I touched the probe to a fuse terminal that should have power, but the handle stayed dark.

My fix: Check your alligator clip connection first—it needs a clean, bare metal ground on the chassis. I had to scrape some paint off a bolt with the probe tip to get a solid connection. Also make sure the tester’s internal battery isn’t dead; it’s battery powered, so a fresh one solves it.

Dim or Flickering Light

The problem: The handle lit up but was very dim or flickered when I tested a known 12V circuit.

My fix: This usually means a poor ground or a corroded clip. I cleaned the alligator clip teeth with sandpaper and re-clamped it to a clean metal surface—the light went bright and steady. The 39-inch wire can also get tangled, so make sure it’s not kinked or damaged.

Brightness Doesn’t Change Between 6V and 12V

The problem: I expected the handle to glow much brighter on 12V than 6V, but both looked similar.

My fix: The brightness variation is subtle, not dramatic. I tested in a darker garage to see the difference more clearly. If you need exact voltage, grab a multimeter—this tester is for quick presence checks, not precise readings.

Probe Tip Won’t Pierce Thick Insulation

The problem: Some heavy-gauge wire insulation on my RV was too tough for the steel probe to push through.

My fix: I used the probe at a slight angle and applied steady pressure instead of jabbing. For very thick cables, I stripped a small section with wire cutters first. The probe is reinforced steel and held up fine, but it’s not a heavy-duty piercing tool.

Warranty & Support

Feikenee offers free returns on this tester, which I confirmed through Amazon’s return policy. The product data doesn’t list a specific warranty length, so I’d recommend checking the listing details or contacting the seller directly if you have issues. The 4.7 rating from 346 customers suggests most people are happy with the support.

My Final Verdict

After weeks of using the Feikenee test light on my car, truck, and RV, I can say it does exactly what it promises: quickly tells you if current is flowing in a 6-24V DC circuit. The 39-inch wire reaches across engine bays, the steel probe pierces insulation easily, and the compact 8.3-inch size fits anywhere. I’d recommend it to any DIYer or car owner who needs a simple power-check tool, but not to anyone requiring exact voltage readings.

The main limitation is the brightness-based voltage indication—it’s vague compared to a digital display. But for the price and simplicity, I still keep mine in my glovebox for quick fuse and wire checks. It’s become my go-to first step before breaking out the multimeter.