This morning when I start my car I heard it crank about 2 times and stopped,so I try to crank again but nothing happened....next thing i saw is lot of smoke come from my hood,I open the hood and saw my engine wiring harness caught on fire and a lot of them is melted........can anyone tell me why would this happen???and is there a
good chance that all my ecu is gone too??? please help!!!!
Whether it be a headlight, electric motor or a circuit board, each device in an automobile that uses electricity has the correct amount of internal resistance to draw just the amount of current it needs. So, the device using the power is the throttle that controls the flow of electricity.
When an energized wire gets shorted to ground, and ground on an automobile is any metal part not insulated wire, there is no control over the flow of electricity. The battery or alternator tries to send down this shorted wire all the current it can supply. Ordinarily, if the circuit is protected by a fuse the fuse opens and kills the short.
If the wire happens to be unprotected then the high current in the wire causes the insulation to melt. Next, if the wire is in a bundle, it can melt into other wires and perhaps cause the same problems there. This problem can occasionally cascade throughout the wiring loom.