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🔧 Power up your diagnostics with precision and style!
The OTC 3633 Mini-Coil Cord Circuit Tester is a professional-grade electrical testing tool designed for 6V and 12V systems. Featuring a needlepoint stainless steel probe, a bright red replaceable bulb, and a 12-foot heavy-duty coiled cord, it offers precise detection of shorts, grounds, and open circuits. Its ergonomic slim handle and versatile threaded probe with alligator clip make it an essential, durable tool for automotive and electrical diagnostics.





| ASIN | B003YNHVQQ |
| Best Sellers Rank | #101,386 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #171 in Circuit Testers |
| Brand | OTC |
| Brand Name | OTC |
| Color | Red |
| Compatible Devices | Vehicles with electrical circuits |
| Customer Reviews | 4.7 out of 5 stars 993 Reviews |
| Global Trade Identification Number | 00731413505751 |
| Included Components | Product & Instructions Guide |
| Item Dimensions | 2.85 x 8.55 x 1.7 inches |
| Item Weight | 1 Grams |
| Item dimensions L x W x H | 2.85 x 8.55 x 1.7 inches |
| Manufacturer | OTC |
| Measurement Type | Voltmeter |
| Minimum Operating Voltage | 6 Volts |
| Model | 3633 |
| Part Number | 3633 |
| Power Source | Corded Electric |
| Style | Modern |
| Style Name | Modern |
| UPC | 731413505751 521375009516 071020055936 031112405384 523161139902 012302908908 999992883251 |
| Unit Count | 2261.0 Count |
| Warranty Description | One (1) year limited warranty |
A**A
Good quality
I was thinking about getting a snap on one until I seen this, comes with another alligator clip,it being so small makes it feel better in your hand and easy to get into tighter areas. The tip being so pointed and small makes it’s easy to pierce wiring without breaking wire or putting a big whole
M**N
High quality made very well
Really good product as usual OTC brand high quality is easy to use anywhere in the car fuse box under the hood or under steering wheel, wire terminals even if they are tiny i used one of the teammate working in the shop .i do receive the one purchased from amazon in the weekend i just make test on 9v battery .
W**L
Quality.
Nice tool. Comes in handy and good quality.
J**L
Great test light
Very well built test light and does exactly what it's supposed to! Love the compact size and bright incandescent bulb. Needle tip has a threaded end and comes with an alligator clip.
J**E
Excelente calidad
Mejor que otros
M**C
ONE OF THE BEST TEST LIGHTS AVAIABLE
This design of test light is nearly perfect, and is an amazing value. The quality of the light and cable are really good, and it feels great in your hand. It is able to easily maneuver into tight spots and has become one of my favorite/most used test lights. The provided light bulb is adequate for most uses, but can also be easily replaced with various other options for custom current requirements. I guess OTC has recently discontinued this light???? IF SO I BEG THEM TO RESUME MAKING THEM!
J**R
Works great. Cord is a little stiff and it's hard ...
Works great. Cord is a little stiff and it's hard to open clamp unless you slide the boot back.
S**Z
Nice little unit
Copper earth clamp is a nice touch,nice fat cover for said clamp so no issues there.Earth lead appears to be sealed into the plastic shroud that extends from the tool,so this is a good thing as it means your not pulling on the cord where it enters the tool.Good size unit no too long not too short.The thread at the base of the probe is a nice touch & can fit numerous types of other attachments.Would like to see if poss in future versions,perhaps 3 LED'S (6,12,24) or something to not indicate what the exact voltage maybe but a general idea i.e if there's say 8 volts on a 12 volt system the 6 volt LED lights up ? meh it's just an idea.It will take time for the cord to stay stretched out a bit more so while new it does have quite a return on it so you must be wary of that when using at distances
T**Y
Excellent
I love this test light, especially in tight confines and in this day and age of led everything an incandescent bulb is very handy.
I**L
منتج يستحق
المشكله في الاسعار غير ثابته وترتفع
B**T
Highly valued tool, very useful on more modern vehicles
This is my second OTC test light. I was so impressed with the quality of my normal size version that I came back to purchase this mini version as well and I am glad I did. Overall the OTC test lights are the nicest I've seen. The quality is much nicer than even my snap-on circuit tester which I purchased after my two OTC test lights. The snap-on costs roughly 5 times the price, and although it has the ability to be used as a normal test light with a ground/power indication, as well as a voltage tester, the overall quality is nowhere near as nice. I have barely used the snap-on and find myself reaching for the OTC nearly every time. It's hard to explain what makes them so nice, but as soon as you take it out of the box I'm sure you'll be impressed. The clamp, chord, plastic body, logo printing, light brightness, probe tip are all excellent. The brilliant part about the mini OTC is it's usefulness on more modern cars with fuse boxes in the glove box or any other tight space. It is considerably smaller than the normal version and is much more maneuverable in tight spaces.
M**T
Great quality test light
This is a professional quality test light suitable for testing 12v vehicle electrical systems. Well built, solid feel. The main alligator clip connector is surrounded by an insulating sleeve, pull that back, clip on, replace the insulator. Spare bulbs available. Does the job, what more do you need.
D**N
Best quality
A superb test light in all senses! The best on market.
Trustpilot
5 days ago
2 weeks ago