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-   -   Repair Trunk Wiring Loom (https://5series.net/forums/e60-discussion-2/repair-trunk-wiring-loom-150779/)

donpb Jul 6, 2020 07:00 PM


Originally Posted by tstiglich (Post 1606410)
I have never had the problem, just read about it. I am assuming that without the grommet that there will be direct wire to metal edge contact. If that is the case, may want to at least wrap the wires in a sufficient amount of electrical tape.

The entire wiring loom wires are wrapped in cloth tape. I had to remove some of it in order to get to the broken wires. I'll be black electrical taping them back. :)

audiophool Jul 8, 2020 05:59 AM

Don't solder and heat shrink!!

The point where the solder wicks into the strands becomes a new point of failure. This is true of any wiring harness that is subject to flexing. Use a butt splice crimp (bare), and cover with adhesive lined heat shrink.

tstiglich Jul 8, 2020 06:29 AM

Agreed, to a point. If soldering, one would have to add a splice of wire of sufficient length such that the soldered ends are not subject to bending stress.

FormerE30Owner Jul 8, 2020 10:54 AM


Originally Posted by audiophool (Post 1606436)
Don't solder and heat shrink!!

The point where the solder wicks into the strands becomes a new point of failure. This is true of any wiring harness that is subject to flexing. Use a butt splice crimp (bare), and cover with adhesive lined heat shrink.

You can also get heat shrinkable butt splice crimps. I have already done a bunch of wires in that same harness.

FormerE30Owner Jul 8, 2020 10:58 AM


Originally Posted by tstiglich (Post 1606440)
Agreed, to a point. If soldering, one would have to add a splice of wire of sufficient length such that the soldered ends are not subject to bending stress.

But that point might be too far into the tube to be accessed. Better to butt crimp a long wire to both ends of the broken wire.

donpb Jul 8, 2020 04:43 PM

I was planning on using wire tap connectors but now butt crimp seems to be a better option. I had pulled the entire hardness out of the tube and so no problem getting to the wires. I haven't fixed it yet because I've been under the weather for a few days and also this isn't urgent. From the photo, you can see that I have two broken wires and two exposed.

https://cimg1.ibsrv.net/gimg/5series...5c99ad4e74.jpg

scottalexander Jul 9, 2020 03:40 AM

I see your thick brown wire is fully cut in half.

When my trunk stop opening and I unraveled the wire loom, my brown wire was also cut in half.

That told me the brown wire was hanging on by a strand for a while (and the trunk still opened).

When my trunk opened I was not observant enough to see the 2 interior trunk lights were out (because those wires were cut in half).

This would have told me to unravel the loom a lot sooner.


donpb Jul 9, 2020 02:57 PM

@scottalexander Yeah this all first started awhile back with the left license plate light notification. But since there are two plate lights, I didn't really care much to fix it in a hurry. What got me moving forward recently though is the trunk would not open. I plan to butt crimp them bad boys this weekend.

scottalexander Jul 9, 2020 03:13 PM

The reason I added 5 inches of extra wire to the broken wires is because I refused to put back the black rubber grommet.

I wanted plenty of wire to move freely for flexibility around where the grommet used to fit.

donpb Jul 9, 2020 04:10 PM

I saw what you posted previously about it being the cause. I agreed. I'm definitely not putting that grommet back in.


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