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OTC 3633-10 Replacement Bulb, (Pack of 10)

4.7 4.7 out of 5 stars 640 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in RV Light Bulbs by OTC
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Purchase options and add-ons

  • Replacement Bulbs
  • 10 pack of replacement bulbs for numbers 3633 and 3639
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Top Brand: OTC

Highly Rated
100K+ customers rate items from this brand highly
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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
OTC Shop Equipment Power Train Lifts Stands Cranes Presses DPF Equipment
OTC Tools Special Service Tools automobiles car truck motorcycle
OTC Professional Diagnostics Encore Scan Tool

Product Description

OTC Replacement Bulb, (Pack of 10) 10 pack of replacement bulbs for numbers 3633 and 3639.

Product information

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Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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OTC 3633-10 Replacement Bulb, (Pack of 10)

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
640 global ratings

Customers say

Customers like the performance, quality and brightness of the auto accessory. For example, they mention it works great, lasts for quite a long time and the light is bright enough to see in full direct sunlight. That said, they appreciate the value for money.

AI-generated from the text of customer reviews

20 customers mention20 positive0 negative

Customers are satisfied with the performance of the auto accessory. They mention that it works well in their 83 Chevy truck, the price was good, and the quality is good. Some say that it's a perfect replacement bulb.

"...The original was just regular. Serves it's purpose just fine though and if I ever use up the remaining 9 from this pack I would buy it again." Read more

"Used to replace bulb in Snap On test light. Worked great. Had to stretch the retaining spring a little to make it work. Easy to see in daylight." Read more

"Works perfect !!!!" Read more

"The price was good they worked awesome quality is good." Read more

16 customers mention12 positive4 negative

Customers like the quality of the auto accessory. They say it's a high-quality product, works in Snap-on test lights, and is a perfect replacement bulb.

"...there are 10 in a pack, those should last for quite a long time." Read more

"Good product" Read more

"...These must be for one test and your done. Returning for refund, completely junk. Guess I'll just buy a new led test light." Read more

"Excellent red incandescent (no crappy LEDs here) bulbs! Thank you, will buy again surely." Read more

9 customers mention9 positive0 negative

Customers are satisfied with the brightness of the auto accessory. For example, they mention that the light is bright enough to see in full direct sunlight, the red light is kind of cool, and it looks like a neon light. Some say that it looks and lights just like the original bulb.

"...The red light from this is kind of cool. It looks something like a neon light. The original was just regular...." Read more

"...received Tuesday and replaced with new bulb, voila, the light is bright enough to see in full direct sunlight. very happy to have ordered these...." Read more

"I like the product because of the color of light" Read more

"...I am very pleased. Its bright enough to use outdoors yet not too bright that it blinds you. Price is good also. Perfect." Read more

9 customers mention9 positive0 negative

Customers appreciate the value of the auto accessory.

"...Price is good also. Perfect." Read more

"Bright and awesome value. A lot of testers I've seen don't let you change the bulb. So go with OTC." Read more

"Great price for what I needed" Read more

"The price was good they worked awesome quality is good." Read more

3 customers mention3 positive0 negative

Customers are satisfied with the fit of the auto accessory. They mention that it's a perfect fit and the right size for their test light.

"10 for 10 working bulbs! Just the right size for my test light too." Read more

"As advertised perfect fit and function" Read more

"Perfect fit..." Read more

Top reviews from the United States

Mike Boswell
5.0 out of 5 stars Replacement for snapon
Reviewed in the United States on September 15, 2020
Verified Purchase
This worked fine. I bought to replace a bad one in my old snapon test light that had been in there since 1995. Had to dig the old one out but after doing so this went in and after a top cable adjustment it works flawlessly. The red light from this is kind of cool. It looks something like a neon light. The original was just regular. Serves it's purpose just fine though and if I ever use up the remaining 9 from this pack I would buy it again.
3 people found this helpful
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Stacey
5.0 out of 5 stars stoked
Reviewed in the United States on October 26, 2022
Verified Purchase
I thought my diagnoses was going to be harder than it should because I had no power on circuits that should be powered. turns out my Matco bought 7 y.o. otc 3634 test light bulb had melted the red sleeve inside the bulb and i couldn't see it in a dark under dash cover. ordered these Monday , received Tuesday and replaced with new bulb, voila, the light is bright enough to see in full direct sunlight. very happy to have ordered these. there are 10 in a pack, those should last for quite a long time.
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Cindy
5.0 out of 5 stars They work
Reviewed in the United States on April 20, 2024
Verified Purchase
Incandescent Not Led which is a good thing.
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Impac
5.0 out of 5 stars Pleasant find
Reviewed in the United States on February 9, 2024
Verified Purchase
Been at a loss with my favorite test light found these made my day my trusty test light is back will buy more
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Sean
5.0 out of 5 stars They work
Reviewed in the United States on October 21, 2023
Verified Purchase
It was a guess and they worked
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JN
4.0 out of 5 stars I like the color and it does what it's supposed to
Reviewed in the United States on June 21, 2021
Verified Purchase
I like the product because of the color of light
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Proud Vet
5.0 out of 5 stars Works in Snap-on test lights. Perfect replacement bulb.
Reviewed in the United States on November 11, 2018
Verified Purchase
I put these in my Snap-on test lights CT4G and EECT300A. It worked liked it was designed for them. I like it better than the original bulbs. I am very pleased. Its bright enough to use outdoors yet not too bright that it blinds you. Price is good also. Perfect.
8 people found this helpful
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DC4L
5.0 out of 5 stars Excellent value
Reviewed in the United States on February 19, 2023
Verified Purchase
This item is oem quality but at a fraction of the cost because it is sold in bulk. Replaced the bulb on my snap on test light perfectly.
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Top reviews from other countries

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Jason
5.0 out of 5 stars Light up fuse
Reviewed in Canada on October 31, 2023
Verified Purchase
Work great thx
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Amazon Customer
5.0 out of 5 stars Great bulbs
Reviewed in Australia on April 24, 2024
Verified Purchase
Very nice!!
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Tremblay Lise
5.0 out of 5 stars Qualité
Reviewed in Canada on September 2, 2020
Verified Purchase
Parfait
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Kyle Wilde
5.0 out of 5 stars Five Stars
Reviewed in Canada on March 23, 2017
Verified Purchase
They're nice and bright replacements for the original dim bulb in my test light
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louie
5.0 out of 5 stars Five Stars
Reviewed in Canada on February 4, 2016
Verified Purchase
Fair price
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