Repair Parts

Square Wheel Industries testers are tough, and our warranty is the best in the industry, so why would anyone need repair/replacement parts? A great question.

We have been the industry leader for a long time and as a result, we have testers still in use that were built over 20 years ago! Millions of cycles can take their toll on even the highest quality parts like circuit breakers and switches, and while we will always provide repair services at our factory, these are easily field replaced as well.

Click on the tester product name below for which you need a part to see a complete list of the parts available.

If you prefer factory replacement, please call our support department at: 610-921-8561.

Most parts are in stock and will ship within two working days. We will contact you if there is a backorder.

Scanner – Trailer Lighting System Tester

Order # Repair Replacement/Part
51265 Toggle Seal, Black
62001 Scanner Circuit Board –
65014 Switch – Toggle, SPST
65019 Switch – Toggle, DPDT, Center Off
65132 Relay – SPDT, w/Resistor
65610 Circuit Breaker – 10A, no bracket
65620 Circuit Breaker – 20A, no bracket
72082 Plug – SAE 7-Pole
72093 Cable Assy – 7-way, Scanner
74101 Insulator – Battery Terminal, Black
74102 Insulator – Battery Terminal, Red
76144 Test Clip – 50A, Black Handles

Express Mobile – Trailer Light and Air Brake System Tester

Order # Repair Replacement/Part
51265 Toggle Seal, Black
60201 Lamp – 2 in. Red
60202 Lamp – 2 in. Blue
60700 Grommet – 2 in. lamp mounting
61106 Circuit Breaker – 10 A w/bracket
61108 Circuit Breaker – 15 A w/bracket
61120 Circuit Breaker – 20 A w/bracket
62001 Scanner Circuit Board –
63117 Remote – 2-Channel w/Decals and Battery
63118 Radio Receiver – 2 Channel
65014 Switch – Toggle, SPST
65019 Switch – Toggle, DPDT, Center Off
65028 Switch – Toggle, DPDT
65132 Relay – SPDT, w/Resistor
81109 Regulator w/Filter, 1/4 npt
81154 Solenoid valve – 3-Way, 1/4 npt, 12V
81637 Filter – In-line, 1/4 npt
82409 Gauge – 160 psi, 2.5 in.
85954 Valve – Ball, 1/4 npt

Express Garage – Trailer Light and Air Brake System Tester

Order # Repair Replacement/Part
11508 Wheel – 8 x 2 in, .5 in axle
11604 Caster – 4 x 1.25 wheel, .5 stem
16155 Hold-down Bolt – pair – 10 in, J-type
16167 Hold-down – Battery Cross Bar
31012 Grab Handle – 12 in. Mtg Centers
51265 Toggle Seal, Black
60201 Lamp – 2 in. Red
60202 Lamp – 2 in. Blue
60700 Grommet – 2 in. lamp mounting
62001 Scanner Circuit Board –
63117 Remote – 2-Channel w/Decals and Battery
63118 Radio Receiver – 2 Channel
65014 Switch – Toggle, SPST
65019 Switch – Toggle, DPDT, Center Off
65028 Switch – Toggle, DPDT
65132 Relay – SPDT, w/Resistor
65610 Circuit Breaker – 10A, no bracket
65615 Circuit Breaker – 15A, no bracket
65620 Circuit Breaker – 20A, no bracket
72082 Plug – SAE 7-Pole
72094 Cable Assy – Express Garage
74101 Insulator – Battery Terminal, Black
74102 Insulator – Battery Terminal, Red
76144 Test Clip – 50A, Black Handles
80075 Valve – Safety – 150 psi, 1/4 npt
80117 Hose assy- Air Brake, Rubber, 3/8 in
81018 Filter – Primary, 1/4 npt
81113 Regulator – 2-150 psi, 1/4 npt
81113-A Regulator Nut
81154 Solenoid valve – 3-Way, 1/4 npt, 12V
81637 Filter – In-line, 1/4 npt
82409 Gauge – 160 psi, 2.5 in.
84044 Valve – Check, 1/4 npt
85042 Gladhand – Emergency (Red), 1/2 npt
85045 Gladhand – Service (Blue), 1/2 npt
88013 Switch – Stoplight, 1/4 npt
89584 Valve – Needle, panel mount, 1/4 npt

RVCHECK – RV Protocol Trailer Light and Electric Brake System Tester

Order # Repair Replacement/Part
60114 Lamp Assy – Panel Indicator – Red
60115 Lamp Assembly – Panel Indicator – Amber
62028 Resistor – 10 Watt, 27 OHM
63094 Flasher – 12V, 2 Pin Electronic
65114 Switch – Toggle, SPST, w/proof
65610 Circuit Breaker – 10A, no bracket
65620 Circuit Breaker – 20A, no bracket
72095 Cable Assy -RVcheck
74101 Insulator – Battery Terminal, Black
74102 Insulator – Battery Terminal, Red
76144 Test Clip – 50A, Black Handles
82201 Ammeter 0-20

Checkmate 1200-A – Trailer Light Tester with Ammeter

Order # Repair Replacement/Part
62028 Resistor – 10 Watt, 27 OHM
63094 Flasher – 12V, 2 Pin Electronic
65114 Switch – Toggle, SPST, w/proof
65610 Circuit Breaker – 10A, no bracket
65620 Circuit Breaker – 20A, no bracket
72082 Plug – SAE 7-Pole
72092 Cable Assy – 7-way Checkmate
74101 Insulator – Battery Terminal, Black
74102 Insulator – Battery Terminal, Red
76144 Test Clip – 50A, Black Handles
82201 Ammeter 0-20

Checkmate – Trailer Light Tester

Order # Repair Replacement/Part
62028 Resistor – 10 Watt, 27 OHM
63094 Flasher – 12V, 2 Pin Electronic
65114 Switch – Toggle, SPST, w/proof
65610 Circuit Breaker – 10A, no bracket
65620 Circuit Breaker – 20A, no bracket
72082 Plug – SAE 7-Pole
72092 Cable Assy – 7-way Checkmate
74101 Insulator – Battery Terminal, Black
74102 Insulator – Battery Terminal, Red
76144 Test Clip – 50A, Black Handles

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