how many amps does this pull on a 12v system?

Mine, with the factory installed bulb draws 157mA @ 13.1V... which comes to dash over 2W all said & done.

can it be used on 24 V AC circuit's

No it can't but the OTC 3642 will do 24v systems but I'm not sure about ac current though

Is this item computer safe?

Pulls, at peak, less than half an amp and 50 mA continuous. Use inline when circuit integrity testing and is very safe and useful when applied properly. Great for 5volt reference circuits. And yes this is the model ScannerDanner uses in 80% of his 1000+ videos.

I need to replace the fuse in my tester, I have 12v fuses just wanted to know what amp fuse is used.

They are 1.5v bulbs, not fuses.... low amp consumption. Otc sell them on Amazon. Do not use a fuse.

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OTC 3633 Mini-Coil Cord Circuit Tester, Red

OTC 3633 Mini-Coil Cord Circuit Tester, Red

Product ID: 255000156

Details

Brand
OTC
Colour
Red
Item weight
1 Grams
Power source
Corded
Style
Modern

🌀12-foot heavy-duty coiled cord

🔧Needlepoint stainless steel probe

🔴Bright red high-intensity bulb

S$84

Duties & taxes included

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Description

🔴 Power up your diagnostics with precision and style!

VERSATILE CONNECTIVITY - Includes screw-on alligator clip for multi-functional testing scenarios
HIGH VISIBILITY INDICATOR - Bright red replaceable bulb for instant circuit status feedback
PINPOINT PRECISION TESTING - Needlepoint stainless steel probe for effortless back probing and piercing
EXTENDED REACH FLEXIBILITY - 12-foot coiled cord ensures you can test hard-to-reach circuits with ease
OPTIMIZED FOR VEHICLE SYSTEMS - Compatible with 6V and 12V electrical systems, perfect for automotive pros

The OTC 3633 Mini-Coil Cord Circuit Tester is a compact, professional-grade tool designed for quick and accurate electrical system diagnostics. Featuring a durable needlepoint stainless steel probe, a bright red high-intensity bulb for clear circuit indication, and a 12-foot heavy-duty coiled cord, it’s optimized for 6V and 12V vehicle systems. UL and CE certified, this tester combines reliability with ergonomic design, making it a must-have for any serious automotive technician or electrical professional.

Specifications

ASIN	B003YNHVQQ
Best Sellers Rank	#249,851 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #377 in Circuit Testers
Brand Name	OTC
Color	Red
Compatible Devices	Vehicles with electrical circuits
Customer Reviews	4.8 4.8 out of 5 stars (963)
Global Trade Identification Number	00731413505751
Included Components	Product & Instructions Guide
Item Dimensions	7.2 x 21.7 x 4.3 centimeters
Item Weight	1 Grams
Manufacturer	OTC
Maximum Operating Voltage	12 Volts
Measurement Type	Voltmeter
Minimum Operating Voltage	6 Volts
Model	3633
Part Number	3633
Power Source	Corded Electric
Specification Met	UL 61010-1, CE Marked, RoHS Compliant
Style Name	Modern
UPC	731413505751 521375009516 071020055936 031112405384 523161139902 012302908908 999992883251
Unit Count	2261 Count

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