The sharp steel probe can easily pierce the wire insulation to check the circuit. Connect the alligator clip to the ground and test the circuit with the probe. When the light is on, there is electricity.
eBay
DC 5-12V Car Hidden Amplified Antenna 85-860Mhz Car Electronic Radio Antenna Booster Stability Signal FM Amp for Truck Boat Auto
Aliexpress UK
Sharp steel probe easily pierces wire insulation to inspect circuits. Bulb: 3W, Bulb Cord Length: 102mm/4.0". The circuit board has line protection function, which is safer and more resistant to burning.
eBay
Baseus 150W Car Inverter DC 12V to AC 220V EU Version Auto Power Inversor USB Type C Fast Charger For Car Power Adapter
Aliexpress UK
New EM285 Automotive Electric Circuit Tester Car Electrical System Tester 6-24V DC Multi-function Drive Test Pen Diagnostic Tool USD 12.09 /piece.
eBay
Wireless Android Auto & CarPlay 5.8 GHz Adapter for OEM Wired CarPlay & Android Auto Cars Convert Wired to Wireless
Aliexpress UK
The fuse puller can help you remove the fuse easily. It is equipped with a transparent cover to check the fuse status. 306 pcs automotive fuse for fuse door, assembly with mini blade fuse (2A 5A 7.5A 10A 15A 20A 25A 30A 35A ), automotive standard blade fuse with switch.
eBay
Auto Car Radio FM Antenna Signal Booster Amplifier Universal 12V FM Car Radio Antenna Enhance Amplifier Accessories
Aliexpress UK
eBay
MEKEDE Universal Car Radio 1din 6.86-inch Multimedia Smart Screen CarPlay Andriod Auto BT USB TF FM Auto Radio MP5 Type-C
Aliexpress UK
1 Piece Car Fuse Tester Puller. Suitable for Car Fuse. LED Light: Green. Color: Yellow. Actual color may be slightly different from the image due to different monitor and light effect.
eBay
Car Radio FM Antenna Universal Auto 5M Length Signal Amp Amplifier Marine Car Vehicle Boat RV Signal Enhance Device
Aliexpress UK
1 x Car Test Light Tester Probe Pen. The unique long-life light tube, not produce heat, comfort and safety.
eBay
250W PD Car Charger QC3.0 Fast Charge Six Car Cigarette Lighter Plug Car Charger Flash Charge with Digital Display
Aliexpress UK
Fuse puller and circuit tester: The fuse puller can help you replace and remove the fuse easily, conveniently and quickly. [Portable Storage Box] 306 automatic fuses and 2 fuse pulls, circuit tester are.
eBay
DC 5-12V Car Electronic Radio Antenna 85-860Mhz Car AM/FM Radio Aerial Signal Amplifier Booster Antena for Car Truck Motorcycle
Aliexpress UK