The Point of my car tends to burn after a while. So I'm self diagnosing the issue and need some guidance and ideas from experts.
Here is the Diagram of the wires relating to Contact Points and Coil.
Wire 1: It brings +12 Volts to this whole system. It turns on with key switch, on second last turn that is before Self. So it keeps turn on as long as the car is running after giving self.
Wire 2: It is the current of Wire 1 after passing through Ignition Coil. It goes to Distributor and inside it Points are connected in series with it to the ground.
Wire 3: It is the current of Wire 1 it goes to Radiator Fan by passing through a Large white Resistor.
Wire X: It is the current of Wire 1 which turn on some Relay which i cant see but can hear . If i disconnect the fan to reduce sound noise while im inspecting than if i connect/disconnect this wire x, i can hear some relay clicking.
So in this whole system only current is introduced by Wire 1. Which i tested with multimeter its around 12V
Now what i think is that the 12 Volts are very high for points so thats why they tend to burn. Is there any 9V wire that i can test ?
Last time the car refuse to start when i was going back from mechanic shop after having some other work done. It was a surprise to me because it always starts very well.
So i told him to check. He said the points are burned. He even tried to scam me by saying look one side of the point has hole in it. I said no its just like that, i got it installed 2 days ago.
Then he cleaned the Contact Point and kept playing with wires here and there for 15 minutes. After that he said to decrease current i have to change this large Hadi to Smaller one.
Hadi = (Resistor i later came to know after self diagnose). At that time i didnt know and said do whatever just fix this point issue. So he installed the smaller resistor by saying it will reduce the current.
On way back home i stopped multiple times and whenever i give it self it took 4-5 self's to start. I was really very unhappy with the work of mechanics + their Labor charges + the cost of their Jugars. I thought it would be wise if a person just replace the old part whole rather than going to the repeated cost of mechanics.
So i came back home. At night I took my Tool box, Multimeter and began to trace wires and see whats going on here. After some inspection i found that The Large resistor he has removed is somehow causing the issue so i put the Larger resistor back and removed his smaller resistor. The car was again starting as before with one self.
Larger Resistor has less resistance. (Fan speed is high on it)
Smaller Resistor has more resistance. (Fan speed in low on it)
Now i Need to know how can i reduce the voltages to Coil and Point which will be basically from the same current source.
Also, i know that the coil put some back EMF Flux so to counter that i purchased a new condenser and installed it along with other older for the time being. But by doing this spark is even more stronger at points.
Another idea i have is to put some Voltage reducer like a transtor for 9V. 7809 Voltage Regulator 9V but it can handle only 1 amp. I think the coil will be on 10 Amp max.
