How to Make a Car Fuse Tester and A Quick Voltage Indicator
In the following five steps you will have a fuse tester and a quick voltage indicator for cars
STEP1: What you need:
1- One neon tester for line voltage screw driver shape /with bigger compartment is better. Shown in the above photo
2- 50 cm wire no 2/5
3- A roof lamp of KIA pride car and/or slimmer one this is depend on your neon lamp tester compartment/top and bottom of the lamp must be metallic
4- Extra spring small one. You may also use the spring of neon tester as well. By pulling the spring from two side you will have bigger and stronger spring for this project
You have to open the back holding cap of neon tester. And you won’t need the neon lamp and the assembly because it won’t work with the car DC 12 volt.
You have to make a hole in the back cap with drill no 2.5 to let the wire of tester go through.
Step 4 :
Assembly of tester has six steps:
One. Place the lamp inside the compartment of tester.
Two. Let the wire go through the cap that you drilled before and.
Three. Hook the wire to big spring ( I have to mention that is not require to solder but if you solder it is better)
Four. Place the spring inside the compartment
Five. Do not forget the cap, this must be keep close everything
Note : spring must be strong enough to keep the head of the lamp in good contact with the end of the screw driver that is present in the bottom of compartment
Six. solder the other end of wire to wire clip
project is completed.
HOW THIS TESTER WORKS :
By clipping the wire clip to body of the car (in most cars the chassis of the cars are the negative side of the buttery ) you attached to negative side of the circuit if the voltages are excite in your testing point by touching the end of the probe of your tester the lamp will glow and indicate the continuity of circuit and or presence of voltage.
For testing the fuses just clip the wire to the any metallic surface of car and by touching the fuse if the fuse is intact the lamp will glow otherwise the fuse is gone do not forget that fuse has 2 contact in back side both contacts must fire the lamp otherwise the fuse is bad
Testing the tester on car battery-it should should be very bright
NOTE: I made this project with help of the LEDs but I personally prefer this tester with of 12 dc lamp of the car due to the following reasons:
1) The illumination of car lamp is much stronger than LEDs especially cars are being tested out door (under sunlight) to see the light of LEDs are difficult.
2) In LEDs, the polarities – + must be observed otherwise tester will not work but in lamp style no polarities is required to be observed.
Enjoy car repairing.
This article was prepared for you by Mr Beh from Iran.
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