DIY car tester

Electronics / Instruments

Added 4 commentary

Despite the high reliability of the car’s electronics, one has to deal with repairs. Sometimes lights, headlights, side lights stop working. The malfunction can be like a burnt out bulb or a fuse.
Finding the cause of the breakdown is not easy without a tester.

So, what do we need:
- Any plastic case;
- LEDs 2 pcs;
- a bulb on 12 V;
- button;
- 1-2 kOhm resistor;
- acute contact;
- wires;

As the case, I used a phone charger from the cigarette lighter
we make holes for the LEDs in the case, it is desirable to use LEDs of different colors, but I only have red, I will use them.

We solder the wire to a sharp contact with them, we will pierce the insulation of the wire.

We solder everything as shown in the diagram; the light bulb is designed to check a low-current wire or not.

The light bulb was installed inside the case and it will be so visible, but you can make a hole under it.

The first LED is on.

The second LED means minus.

I closed the button so that without clicking on it to check the light bulb. The light bulb is designed to test a low-current wire or not.

This device is very convenient to check the fuses for one minute and the fuses are checked.

August 18, 2018 07:29 +2

Reply To quote A complaint

Where in the car can you see the minus relative to the body?
The use of LEDs for control is not justified. If we have an oxidized contact in the headlamp, then the LED will light up quietly and show that everything is working properly. For such checks, it is the lamp that is needed, and not a simple one at 1 Watt, but normal, at 20 watt, for example, for brake lights.

August 17, 2018 10:49 p.m. 0

At the end of the wire, it is better to solder the plug with the ability to put a “crocodile” on it, and not just throw the stripped end.

August 17, 2018 21:15 0

Instead of a pin, you can also use a thin sewing needle; in both cases, the non-working part of the needle (pins) must be insulated.

August 17, 2018 20:51 0

Punching wires is not a good idea, but if you do so, then not with this terrible “nail”, but with a pin (not English, but ordinary).

The light is designed to check the low-current wire or not.

That is, you are sure that all low-current circuits withstand the short-circuit without consequences, and the resulting malfunctions are not dangerous for the equipment? Most likely, the way it is, but nevertheless - reasonably develop my doubts.

T9 )))

DIY car tester

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