



🔧 Diagnose like a pro, never miss a spark!
The OTC 3633 Mini-Coil Cord Circuit Tester is a compact, professional-grade electrical testing tool designed for 6 to 12-volt systems. Featuring a needlepoint stainless steel probe and a versatile screw-on alligator clip, it locates shorts, grounds, and open circuits with precision. Its bright red replaceable bulb and 12-foot heavy-duty coiled cord deliver high visibility and extended reach, while the ergonomic clear handle ensures comfort. Trusted by technicians for fast, reliable diagnostics that boost productivity and shop profits.





| Brand | OTC |
| Power Source | Corded Electric |
| Style | Modern |
| Color | Red |
| Item Weight | 1 Grams |
| Item dimensions L x W x H | 2.85 x 8.55 x 1.7 inches |
| Min. Operating Voltage | 6 Volts |
| Measurement Type | Voltmeter |
| UPC | 731413505751 521375009516 071020055936 031112405384 523161139902 012302908908 999992883251 |
| Manufacturer | OTC |
| Global Trade Identification Number | 00731413505751 |
| Item Weight | 0.035 ounces |
| Product Dimensions | 2.85 x 8.55 x 1.7 inches |
| Item model number | 3633 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 3633 |
| OEM Part Number | 3633 |
| Voltage | 12 Volts |
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.
T**A
Great test light
Best test light imo. Doesn't get better than this
L**N
Very good
Very good 👍
J**N
It's great bye thank you
Paradox sold by the solar was exactly as described.Thank you very much
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!
A**E
Premium built quality.
Awesome test light.
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
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