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OTC 6589 Electronic Ignition Spark Tester

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366 ratings

| 14 answered questions

List Price:	$23.95
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Electronic ignition spark tester
Check for spark on gasoline engines
Used in import and domestic cars trucks plus small engines
Lifetime limited warranty

› See more product details

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Product information

Technical Details

Manufacturer

OTC

Brand

OTC

Item Weight

5.6 ounces

Product Dimensions

8 x 5 x 1.5 inches

Item model number

6589

Is Discontinued By Manufacturer

Exterior

Smooth

Manufacturer Part Number

6589

OEM Part Number

6589

Folding

Additional Information

ASIN

B0050SFVO2

UNSPSC Code

25170000

Customer Reviews

366 ratings

4.4 out of 5 stars

Best Sellers Rank

#17,236 in Automotive (See Top 100 in Automotive)
#3 in Ignition Testers

Domestic Shipping

Item can be shipped within U.S.

International Shipping

This item can be shipped to select countries outside of the U.S. Learn More

Date First Available

August 11, 2004

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Product description

Check for spark on gasoline engines used in import and domestic cars and trucks plus small engines.

From the manufacturer

OTC Otawonna Tools Equipment HD Specialty Service Professional Technician Diagnostic

OTC A Proud Heritage Since 1925 Quality Tools and Equipment Professional Service Specialty Tool

Proud Heritage of Manufacturing Quality Tools and Equipment

Steve Cross

Drop Forge Operator of 40 years

“I’M PROUD OF THE OTC BRAND. I’M MAKING A BRAND THAT’S BEEN AROUND A LONG TIME. ANY GUY THAT’S WORKED ON A CAR HAS HEARD OF THE OTC BRAND, AND THEY PROBABLY HAVE USED IT.”

At OTC, we're proud of our heritage and those that have built it with us.

OTC - Proudly Serving Professional Technicians for Almost a Century

What We Like Most About Technicians is Their Work Ethic

Technicians are problem solvers who aren’t afraid of sweat on their brow and grease on their hands. They provide high quality services that demand high quality tools. When they need a reliable tool, they know they can depend on OTC tools to deliver.

Owatonna Tool Company for the long haul — proudly designing and manufacturing American specialty service tools, diagnostics and shop equipment since 1925.

Automotive Specialty Tools
Heavy Duty Truck Service Tools
Heavy Duty Shop Tools
Motorcycle Tools
Electronic Diagnostic Tools
and so much more

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Customer Questions & Answers

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Customer reviews

5 star		73%
4 star		10%
3 star		5%
2 star		3%
1 star		9%

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Captain Packrat

It works.

Reviewed in the United States on April 3, 2018

Verified Purchase

My spouse was on a work trip and when I tried to move his car, it wouldn't start. I worked on it for a couple days and the symptoms were pointing to the distributor, so I ordered this tool to test it. When my spouse returned home, I hooked it up and had him get behind the wheel and crank the engine.

Naturally, the engine started on the first try. Of course.

But in any event, the spark tester worked perfectly and I could easily hear the thing ticking away even over the sound of the engine.

5 people found this helpful

Helpful

Comment

EAGLESOAR1

Professional Mechanic here

Reviewed in the United States on May 7, 2013

Verified Purchase

I own an automotive repair facility that employs 3 other technicians and I have been using spark testers for over 30 years and I have tried them all:
1. The plastic encapsulated ones (not reliable or accurate)
2. The "In Line" type - NEVER - NEVER USE THESE!!
It only takes around 10,000 volts to "light" those up - but todays cars need upwards of 50,000 volts so you'll have a "light" but not enough volts to fire the spark plug.
3. I have had 2 OTC 6589's in my box for 20 years - they ALWAYS work AND tell the TRUTH!
Yes, I have played around with the others and ALL OF THE DIFFERENT STYLES OF THE FIRST 2 I LISTED HAVE CAUSED ME TO MISS A DIAGNOSTIC. (Hence - cost me productivity time & money)
But, when I am in doubt, I grab my OTC and PROVE IT!
I NO LONGER USE OR ALLOW IN THE SHOP ANY OTHER SPARK TESTER THAN AN OTC.
When I am diagnosing a V-6, V-8 or V-10 motor, I use 2 of these at the same time - one on each side of the motor.
Sadly, I dropped one and it being porcelain - it broke (just like a regular spark plug would)
So I just ordered 2 more today to keep in my shop.
By the way--- the KD 2757 that "LOOKS" the same as the OTC one DOES NOT!!! They changed the design and it is now "plastic encapsulated" and not as accurate. (Same design as the KD 2756)
Yes - the OTC is more expensive but this is truly a case of " YOU GET WHAT YOU PAY FOR!"

Update:
Something I forgot to mention - the clips on these are as heavy duty as they could make them with the amount of material they have to work with.
I don't use the clips on the tester itself (yes, they break)
I use a 3 foot jumper wire I made out of common "lamp cord" with alligator clips on each end. (it's flexible, heavy duty and rated for 25 amps)
(also see: Kastar Hand Tools (KAS1138) 2 x 30' Magnetic Retractable Test Leads - 10 amp rating)

I clip one end of the jumper wire to the spark tester clip and the other end to the CLEAN Negative post on the battery - not any metal on the engine itself.
If you don't "KNOW" that you have a good ground (rust, corrosion, bad ground from battery to engine block) then you could make a false diagnostic not due to the spark tester operation but because you didn't have a good ground path for the current.
Whenever I am testing electrical, I NEVER ground to the frame or body - I always run a jumper wire to the battery negative post - and make sure the negative battery post is clean!

132 people found this helpful

Helpful

Comment

Will

Works Great! Want to address the "Spring Issue" from other reviews.

Reviewed in the United States on October 12, 2018

Verified Purchase

This tester is nice. It doesn't break the bank and if you get spark you know everything is good. It takes the guess work out of having to measure the spark etc from other testers. If you don't get spark and you have it properly grounded you know something is wrong. I read a few reviews before purchasing this at least one of which complained about the spring mechanism that clamps the tester to said ground. Truth be told on my fist use YES it did come apart because the spring popped out but it is simply because the clamp is not very big and the spring has no real groove to rest in. IMO this is not an issue as it can be put back together VERY simply and does NOT break when this happens. In fact in my case I was testing the coil on a 2002 civic and it was difficult to get it clamped to any nearby ground anyway. It worked better without the spring and me just holding it. That said I gave it 4 stars for this reason. It can be a little hard to get it grounded depending on your car and style of engine. But all in all it worked flawlessly and was a quick way to diagnose my misfire. I would say on the next version maybe make a larger clamp connection or maybe include an extension for the ground. But all in all a great cheap device!

3 people found this helpful

Helpful

Comment

Randy Johnson

I tested this product on two vehicles in good operating condition and it failed to produce any kind ...

Reviewed in the United States on April 13, 2018

Verified Purchase

I tested this product on two vehicles in good operating condition and it failed to produce any kind of spark at all. I am not a professional mechanic but I have worked on the various ignition systems over the decades and have some idea of what I am doing. Also, I note that the picture on the web site is totally misleading if not outright false advertising. The picture shows the clip stamped with "Mueller Clip" and it shows the steal housing of the tester stamped with "Made in USA". What you get is a package with OTC name on it and on the back of the package is Made in Taiwan. There are no stamping on the clip or steal housing of any kind. The only marking on the product is HEI on the insulator. Further, the metal of the unit looks like the kind of cheap material you can expect from an import.
From 20-20 hindsight I would advise not buying this unit at all since there is another similar unit sold by amazon at about 3/4 the cost. Also, the competitor (Performance Tool W86553 Ignition Tester) pictures the tool as the one I received from OTC but without stamping on the steal that does not exist.

4 people found this helpful

Helpful

Comment

Phillip Pitts

highly recommended

Reviewed in the United States on June 20, 2015

Verified Purchase

a must have tool in every mechanic's tool box. It has saved me hours and hours of trying to figure out where a misfire is coming from. I've had coil packs that would produce spark when grounded out on a bolt, but with this tool, they were totally dead. Swapped them out with known to be good ones and boom, problem solved. I've used it on several different cars and trucks and it has been a life saver.
I use jumper cables to make sure I have a good ground so that A) the clip doesn't break as it is a bit on the flimsy side and B) so I have space to work.
I'd buy this tool again and again.

9 people found this helpful

Helpful

Comment

Top international reviews

Señor Gar

Stress Test Secondary Ignition

Reviewed in Canada on February 7, 2019

Verified Purchase

Tested 8 ignition coils and 7 looked like video while one (indicated misfire by OBDII) would spark plug but not tester. Great tool for proving weak link. Couldn't be simpler.

2 people found this helpful

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Tricky

HEI only, large spark gap

Reviewed in Canada on January 2, 2020

Verified Purchase

The spark gap is too large for some "coil on plug" ignitions and is barely visible unless you run an MSD or similar, even with a brand new COP coil, and older conventional distributor and coil ignitions don't even bridge the tapered insulator gap at all. I'll stick with an adjustable gap type tester or a preset old "known-good" spark plug for visible confirmation of performance.

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Darren Brewster

Great spark tester with a worthless clip that proves to be unnessesary.

Reviewed in Canada on March 8, 2015

Verified Purchase

This is a great spark tester. I used it to diagnose my ignition coils on an older car. Simple to use, and feels very sturdy. The one failing, which is mentioned in a lot of reviews, is the clip used for grounding it. It is simply too flimsy. Mine sheared right off the third or fourth time I used it! That said, I don't think the clip is necessary at all. The best way to ground it is to use your jumper cables. Much more convenient, and felt way more secure in use. Your engine cranking will tend to shake that little built-in clip right off the ground point. I would recommend this to anyone who maintains their own car. It is an inexpensive addition to your tool kit.

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Rob

K but cheap

Reviewed in Canada on February 8, 2020

Verified Purchase

I bought this tester and the spring flew out and is mia within first use. Wish it was made a bit better but is a good way to test spark when it works. Not very happy it’s now missing the spring. Wasted that 30 bucks

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jim hamilton

Perfection is all I can say

Reviewed in Canada on December 13, 2018

Verified Purchase

His quality tool works amazingly for hei and dis systems and is a necessity

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Tom S.

Works s Advertised

Reviewed in Canada on December 29, 2019

Verified Purchase

Simplistic design that offers proven results for over 40 years. Good value and a must have for your work bench.

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Craig Sue

Quality

Reviewed in Canada on January 10, 2019

Verified Purchase

Great buy. Fast shipping. Recommend this product and seller.

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Chuck Battams

WORKS

Reviewed in Canada on May 30, 2019

Verified Purchase

Uh huh, it works

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Tanner

Nice tester

Reviewed in Canada on March 3, 2019

Verified Purchase

I like it works great

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Jerry

Nice addition to the shop

Reviewed in Canada on March 6, 2019

Verified Purchase

Very nice tool to have in the shop.

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Kevin M.

IF IT WORKS

Reviewed in Canada on October 7, 2019

Verified Purchase

did NOT work it appears as if the center probe is missing
Junk for small eng

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Dan Fisher

Strong qulatity product

Reviewed in Canada on November 4, 2019

Verified Purchase

Very helpful when trying to do the testing by yourself. Clip worked well.

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Moffat66

Five Stars

Reviewed in Canada on January 24, 2017

Verified Purchase

Another great OTC product to add to the tool box

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Jeff

Suited my needs

Reviewed in Canada on November 14, 2019

Verified Purchase

Exactly as advertised. Arrived fast and works great

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T.D.L.

Five Stars

Reviewed in Canada on December 3, 2016

Verified Purchase

Very good product. High quality at a reasonable price. Happy with my purchase.

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OTC 6589 Electronic Ignition Spark Tester

Frequently bought together

Have a question?

Product information

Technical Details

Additional Information

Feedback

Product description

From the manufacturer

Steve Cross

OTC - Proudly Serving Professional Technicians for Almost a Century

What We Like Most About Technicians is Their Work Ethic

Customer reviews

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Top international reviews

You've read the top international reviews