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Thexton THE404 Spark Tester

4.3 out of 5 stars 80 customer reviews
| 3 answered questions

Price: $12.20 & FREE Shipping on orders over $49. Details
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Ships from and sold by Amazon.com.
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  • Alligator clip securely fastens to ground
  • Screw assembly adjusts spark gap quickly and easily
  • Includes safety shield
28 new from $10.99
$12.20 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

  • Thexton THE404 Spark Tester
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Total price: $38.03
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Product Information

Technical Details

Brand Thexton
Item Weight 1.6 ounces
Product Dimensions 7.4 x 1.1 x 5.6 inches
Item model number THE404
Manufacturer Part Number THE404
Folding No

Additional Information

ASIN B0002STSBM
Customer Reviews
4.3 out of 5 stars 80 customer reviews

4.3 out of 5 stars
Best Sellers Rank #9,319 in Automotive (See top 100)
#11 in Automotive > Tools & Equipment > Spark Plug & Ignition Tools
Shipping Weight 0.8 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available July 7, 2004

Warranty & Support

Warranty, Parts:Parts

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Product Description

Works on ignition systems from high energy electronic automotive systems to small engines. Tests for no start conditions and for spark strength. Adjustable gap allows for spark gap requirements from 0 to 40,000 Volts. Gauge background makes spark easy to see for accurate measurement.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
I was working on a mower that was run out of oil and had a brake on the engine dragging. I was almost sure I had a bad coil. I used the spark plug grounded on the engine to check the coil but I must have had a bad ground. I saw this on Amazon and say that you could adjusted it for each engine you were working on and ordered it up. it came in a few day and I tried it on the mower with what I though was a bad coil. I hooked it up and had my wife give it a pull and BINGO I had a good blue spark. I had a hard time seeing the spark at first in a well lite garage but turning off a few light and you can see the blue spark. for $15 including shipping it a great tool for small engines to check for spark. before this one I had a tester with a small light bulb in but it didn't work very well and I don't think the bulb grounded well on the inside of the tester. So if you tinker with small engines buy one these testers well worth the $15.
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By Dane on February 22, 2010
Verified Purchase
I have used this tester for years now. It works flawlessly and its design works well on many applications. Word of caution, just because it has a plastic shield doesn't mean it is protecting you from the spark. If you get a finger too close, it will get you. I know.
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Verified Purchase
This product works as advertised. The spark does not show up well in bright light so I shielded the tester using a black trash bag. I did not consider this to be a problem when compared with the price of the tester.
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Verified Purchase
Difficult to see if you have spark on small engines when they fail to start. This little tool solves the problem, simply remove the spark plug and install the tester, lets you visually see the spark.
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Verified Purchase
This spark tester is used with good results in my outboard motor repairs.
It's a good cheap tool that now that I've used it, I wouldn't be without one.
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Verified Purchase
I used these style spark plug testers at school. they are EXCELLENT! You can adjust how big you want your spark to be, which easily helps you determine if your coil packs or distributors are getting enough voltage or if your spark plug is bad.

Long story short on how to use this tool: You unplug your coil/spark plug wire (depending on the type of ignition system of course) and connect it to the end of the tester that looks like the top of a spark plug. The piece that has an alligator clip just clips onto any part of the car that is metal in order to create a ground. Once it's hooked up, start your car. If you're able to get an arc going across the points in the tester, especially when it's adjusted all the way out, then you know your coils/distributor is getting plenty of voltage so it is good, and is most likely your spark plugs. If you barely get any spark, especially when the tips are almost touching then you're not getting enough voltage for some reason, which indicates a bad distributor/coil packs, or bad wiring somewhere between the coil packs/spark plug wires and the positive battery terminal.
This tool is an excellent little diagnostic tool to have, and I recommend that every mechanic should own one! This is a great tool to help fix misfires and other ignition issues!
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Verified Purchase
the best one sold tuff as nails.i just love it very easy to use. and best part is made in the usa!!!!!!
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Verified Purchase
The spark tester performs as advertised. Its small but does the job. The added feature is the adjustable gap to indicate the spark voltage. Worked great on a small engine.
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