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I'm thinking your car was in a wreck and it may be shredded right? You can see the main harness if you look for it from the the fuse boxes to everywhere else it goes and the branches on it are like a tree. It is usually taped up and wrapped in black. Testing is easier than replacing if it is not destroyed. You need an electrical diagram and learn where the components are located that the wiring goes to. And learn where that circuit goes to the next terminal point or fuse point. You check it point to point with a volt meter if voltage is applied or an ohm meter if you're looking for a completed circuit which is basically a short. Most electrical failures are not because "it's got a short in it" - but because a connection has broken loose in some way and somewhere.

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Q: Is there anyway to be able to see or test a wiring harness to see if it needs replaced on a 1985 5.0 mustang?
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