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Circuit Testers and Short Finders

Mechanics and technicians are all too familiar with electrical mysteries. When there is trouble without an obvious cause, Best Buy Auto Equipment can help. We offer a wide variety of circuit testers and short finders to help businesses like yours find the cause of the problem in every case. Circuit testing equipment is cost-effective and useful for performing common electrical tests on the cars, SUVs, trucks, and vans that come through your garage. We keep our inventory stocked with high-quality testing devices made by trusted brands, such as Chicago Pneumatic, Electronic Specialties, Lisle, K Tool International, KD Tools, OTC Tools, Power Probe, Tool Aid, and more. Shop today to find what you need at an excellent price!
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Lisle Replacement Bulb for LIS28400 Circuit Tester LIS28440 Bulb for LIS28400 Circuit Tester

Lisle Replacement Bulb for LIS28400 Circuit Tester LIS28440

List Price: $2.55
: $1.76
K Tool International 6 or 12V Circuit Tester with 48" Leads KTI72770 Circuit Tester 6 or 12 Volt 48" Leads

K Tool International 6 or 12V Circuit Tester with 48" Leads KTI72770

List Price: $5.99
: $4.31
LiLisle Ignition Spark Tester LIS50850 Ignition Spark Tester

Lisle Ignition Spark Tester LIS50850

List Price: $8.80
: $6.67
Tool Aid 27000 - SGT27000 6/12V Heavy Duty Circuit Tester

Tool Aid 27000 6/12V Heavy-Duty Circuit Tester - SGT27000

List Price: $11.84
: $7.45
Lisle AC/DC Circuit Tester up to 28Volts LIS26250 Circuit Tester up to 28 Volts AC/DC

Lisle AC/DC Circuit Tester up to 28Volts LIS26250

List Price: $9.00
: $7.49
Lisle 13120 - LIS13120 Electrical Separator Connector

Lisle 13120 Electrical Separator Connector - LIS13120

List Price: $11.56
: $8.19
Lisle Spark Tester LIS19380 Spark Tester Indicator

Lisle Spark Tester LIS19380

List Price: $14.12
: $11.13
Electronic Specialties 303B - ESI303B ATC Blade Fuse Buddy DMM Adapter

Electronic Specialties 303B ATC Blade Fuse Buddy DMM Adapter - ESI303B

List Price: $17.66
: $11.80
Tool Aid 27300 - SGT27300 Heavy-Duty Circuit Tester

Tool Aid 27300 Heavy-Duty Circuit Tester w/12' Retractable Wire and Battery Clip - SGT27300

List Price: $20.03
: $12.56
Lisle 20610 Inlline Spark Tester - LIS20610 Inlline Spark Tester

Lisle 20610 Inlline Spark Tester - LIS20610

List Price: $18.59
: $14.19
Tool Aid 28100- SGT28100 Computer Safe Automotive Logic Probe

Tool Aid 28100 Computer Safe Automotive Logic Probe - SGT28100

List Price: $22.03
: $15.89
Thexton Charg-Chek® Battery Tester THX117 Professional Disc Type Battery Hydrometer

Thexton Charg-Chek® Battery Tester THX117

List Price: $21.00
: $16.33
Innovative Products of America 4 and 5 Way Pin Vehicle Trailer Harness Tester IPA7866 4 & 5 Pin Trailer Tester

Innovative Products of America 4 and 5 Way Pin Vehicle Trailer Harness Tester IPA7866

List Price: $25.75
: $16.43
Chicago Pneumatic Cover For CPT749 CPTCA155537 Cover For 749

Chicago Pneumatic Cover For CPT749 CPTCA155537

List Price: $21.39
: $16.49
Thexton Adjustable Ignition Spark Tester THX404 Adjustable Ignition Spark Tester

Thexton Adjustable Ignition Spark Tester THX404

List Price: $21.09
: $17.82
Tool Aid 28000 - SGT28000​ 7" Heavy Duty Automotive Logic Probe

Tool Aid 28000 7" Heavy-Duty Automotive Logic Probe - SGT28000

List Price: $21.75
: $18.65
Innovative Products of America 6 Round Pin Trailer Tester IPA7897 6 Pin Round Trailer Circuit Tester

Innovative Products of America 6 Round Pin Trailer Tester IPA7897

List Price: $30.63
: $19.54
Electronic Specialties 302M - ESI302M Fuse Buddy Tester - Mini Fuse

Electronic Specialties 302M Fuse Buddy Tester - Mini Fuse, 0 to 20 Amp Range ESI302M

List Price: $33.08
: $19.83
Electronic Specialties 306B - ESI306B ATC 30 Amp Fuse Buddy Tester

Electronic Specialties 306B ATC Blade Fuse Buddy Tester - ESI306B

List Price: $34.23
: $20.53
Electronic Specialties 308B - ESI308B ATC Fuse Buddy Current Loop

Electronic Specialties 308B ATC Fuse Buddy Current Loop - ESI308B

List Price: $36.97
: $21.02
Electronic Specialties 307M - ESI307M Mini Fuse Buddy Current Loop

Electronic Specialties 307M Mini Fuse Buddy Current Loop - ESI307M

List Price: $36.97
: $21.02
SG Tool Aid In-Line Spark Checker Kit for Recessed Plugs SGT23970 Spark Tester

SG Tool Aid In-Line Spark Checker Kit for Recessed Plugs SGT23970

List Price: $32.79
: $22.20
Electronic Specialties "Trailer Buddy" The One Man Trailer Wiring Tester ESI220 "Trailer Buddy" The One Man Trailer Wiring Tester

Electronic Specialties "Trailer Buddy" The One Man Trailer Wiring Tester ESI220

List Price: $38.27
: $23.47
OTC Heavy Duty Straight Cord Circuit Tester OTC3634 Circuit Tester Cord Kit

OTC Heavy Duty Straight Cord Circuit Tester OTC3634

List Price: $33.04
: $24.98
Electronic Specialties 304B - ​ESI304B ATC Blade Fuse Buddy Tester

Electronic Specialties 304B ATC Blade Fuse Buddy Tester  - ESI304B

List Price: $48.18
: $27.29
Electronic Specialties Trailer Wiring Buddy 7 Pin Flat ESI222 Trailer Wiring Buddy 7 Pin Flat

Electronic Specialties Trailer Wiring Buddy 7 Pin Flat ESI222

List Price: $43.59
: $27.61
OTC Mini Coil Cord Circuit Tester OTC3633 12v Mini Circuit Tester

OTC Mini Coil Cord Circuit Tester OTC3633

List Price: $37.33
: $27.77
Electronic Specialties 305M - ESI305M 30 Amp Fuse Buddy Mini Tester

Electronic Specialties 305M 30 Amp Fuse Buddy Mini Tester - ESI305M

List Price: $51.31
: $28.86
Lisle 28640 - LIS28640 Circuit Tester Kit

Lisle 28640 The Ultimate Circuit Tester Kit - LIS28640

List Price: $49.95
: $39.40
Fluke FLU-1AC-A1-II 90-1000V ACV Detector

Fluke 1AC-A1-II ACV Detector - FLU-1AC-A1-II

List Price: $62.21
: $41.21
Universal Enterprises Wall Mounted Temperature and Humidity Tester UEIDTH880 Temp Humidity Tester

Universal Enterprises Wall Mounted Temperature and Humidity Tester UEIDTH880

List Price: $93.20
: $53.51
Electronic Specialties EZ Tach Plus ESI328 EZ Tach +PLUS

Electronic Specialties EZ Tach Plus ESI328

List Price: $91.03
: $54.36
SG Tool Aid Short Finder SGT25100 Short Tester

SG Tool Aid Short Finder SGT25100

List Price: $74.56
: $63.92
Electronic Specialties LOADpro® Bundle - Dynamic Test Leads and Fundamental Electrical Troubleshooting Book ESI181 Electronic Specialties 181 LOADpro® Bundle - Tester + Book

Electronic Specialties 181 LOADpro® Bundle - Dynamic Test Leads and Fundamental Electrical Troubleshooting Book - ESI181

List Price: $127.28
: $76.49
Electronic Specialties Fuse Buddy Pro Test Kit ESI310 Fuse Buddy Pro Test Kit

Electronic Specialties Fuse Buddy Pro Test Kit ESI310

List Price: $146.04
: $82.83
SG Tool Aid Intermittent Short Finder and Short Circuit Finder SGT25300 Short Tester

SG Tool Aid Intermittent Short Finder and Short Circuit Finder SGT25300

List Price: $108.93
: $93.39
Innovative Products of America Fuse Saver Short Circuit Locating System IPA8005 Fuse Saver: 10amp, 15amp & 20amp Handles /w 10ft Cord

Innovative Products of America Fuse Saver Short Circuit Locating System IPA8005

List Price: $116.26
: $102.61
E-Z Red Super Automotive Presets and Computer Memory Saver EZRMS4000 Automotive Memory Saver

E-Z Red Super Automotive Presets and Computer Memory Saver EZRMS4000

List Price: $130.69
: $106.91
Innovative Products of America Vehicle-Side Trailer Circuit Tester Pack IPATSTPK1 Vehicle-Side Trailer Circuit Tester Jobber Pack

Innovative Products of America Vehicle-Side Trailer Circuit Tester Pack IPATSTPK1

List Price: $164.99
: $110.47
Waekon Industries Universal Electronic Fuel Injector Quick Probe WAE76462 Probe EFI Electronic Fuel Tester

Waekon Industries Universal Electronic Fuel Injector Quick Probe WAE76462

List Price: $163.25
: $112.12
   
 

Today's vehicles are designed with an array of electrical components, and anything can go wrong without warning. A short circuit is often a fault in the wiring that can cause electricity to shunt between circuits before getting to its destination, but other causes can include old alternators, blown fuses, loose spark plugs, or even ignition issues. That's precisely why electrical test equipment is an absolute must-have for automotive businesses and fleet services. We offer a vast selection of circuit testers for both low-voltage and high-voltage systems, so you can accommodate a wide range of vehicles. With a circuit tester, you can quickly locate shorts or breaks in the wiring, faulty sockets, bad connections, and other symptoms.

In addition to short finders, we also carry an assortment of electrical test equipment for standard ignitions, spark plugs, batteries, and other components. Continuity testers can be used to determine whether an electrical path can be established between two points, whereas spark testers can be used to test for no-start conditions. Whether you frequently service 6-volt and 12-volt electrical systems or you need to diagnose a check engine light concern, we have all your needs covered in our selection. If you have any questions about circuit testers or would like help choosing the best one for your everyday needs, please contact us today for more information or assistance.