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Old Mar 13, 2010, 10:26 AM   #1
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my engine wiring harness caught on fire ,help!!

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!!!!
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Old Mar 13, 2010, 11:30 AM   #2
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A bad ground would do it
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Old Mar 13, 2010, 11:36 AM   #3
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yes, possibly a bad ground. ive seen grounds affect so many different things.
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Old Mar 13, 2010, 03:16 PM   #4
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bad ground near the battery terminal???
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Old Mar 13, 2010, 03:38 PM   #5
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Sounds like a short. Have you had anything done to your car recently?
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Old Mar 13, 2010, 03:42 PM   #6
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all I have do recently is change to individual spark plug coil......I don't think that will cause the short...thanks for the help
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Old Mar 13, 2010, 06:32 PM   #7
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Quote:
Originally Posted by cl271 View Post
all I have do recently is change to individual spark plug coil......I don't think that will cause the short...thanks for the help


Did you wire that up, or was it plug and play?
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Old Mar 13, 2010, 07:53 PM   #8
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it is a plug and play
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Old Mar 14, 2010, 05:37 AM   #9
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Take a good look at the spark plug coil that ou changed and the ground points.
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Old Mar 14, 2010, 11:45 AM   #10
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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.
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Old Mar 14, 2010, 11:51 AM   #11
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which ground point should I check for???
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Old Mar 14, 2010, 11:53 AM   #12
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pics?
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Old Mar 14, 2010, 01:30 PM   #13
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that's the pic from my car, thanks for the help
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Old Mar 14, 2010, 03:05 PM   #14
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It looks like well done.

Try to figure out what happened so you don't fry more wiring when the repair is completed.

As for the repair, there is no easy fix. All wiring that is damaged must be replaced with new loom.
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Old Mar 14, 2010, 03:09 PM   #15
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ppl are telling me that may be my starter shorted and causes the wiring harness to caught on fire,is that possible??
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Old Mar 14, 2010, 03:09 PM
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car, caught, covered, engine, evo, f150, fire, ground, harness, melt, melted, points, starter, we didnt start the fire!, wire, wiring

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