DIY: Test Light

Worthless, but very useful for DIY enthusiasts especially in wiring. This is my custom made Test Light. 

I use 12-volt bulb, wire and safety pin; easy for me to poked into wrapped wire without cutting or spoilt the wire wraps. 

The function of Test Light is to find the suspected wire. For example, to find ACC/ON wire, tap the terminal A to the metal vehicle body/part (-ve), and terminal B (safety pin) poked into the suspected wire. If the test light's bulb lights ON when you turn the ignition key to ACC/ON position, that it is. You also can use multimeter for this job.

My handmade test light

This is an aftermarket test light