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Old 10-07-2020, 10:52 PM   #1
Samson
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Default Wiring harness short

So I had a short in at the ignition switch that fried the wires on the main harness. What kind of nightmare is this to replace? Looks like a new one is $1K, or off a donor car.

If I did an engine swap, would I normally have to swap the whole wiring harness anyhow? Cause if that's the case I'll just try and get an engine and the side stuff.

Or... Someone told me they had a similar issue, and were able to trace the wires back and replace anything damaged with fresh wires. If anyone has done this, or knows of a guide to the harness so I can pull this specific part that would help.

Anyone in WA know of a mechanic willing to tackle something like this?

Uhg, I'm really bummed. Here's a pic of the location I'm talking about. Burnt wires run up as far as I can see them.

1999 318ti
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Old 10-08-2020, 02:57 PM   #2
J!m
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Default

Do the wires run through the firewall to the engine compartment?

An engine harness is seperate from the chassis harness. You need to repair the chassis harness. I suspect there was some chafing of the wires where they pass through the firewall, or possibly other damage from aftermarket radio installation for example.

Least expensive option is to chase it back to the source and repair the bad wires.

Note they will show heat distortion far away from the actual short point, but as long as the insulation is in tact it will be fine. Solder and shrink tubing (plus skill) will be needed.
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