Dash Harness Repair

The GXL from Wirebarn is like a double insulation as you can see in the photo. I don't want to say if its about the same outer diameter as the automotive primary wire even though I *think* it is. I've seen that info, but don't recall where.
Here's another photo closer up.
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Deoxit is relatively plastic safe. The only plastic I've seen it damage is on the plastic square fuses. Its available in different strengths. I think the general spray is 5% and also has some preservative in it. All that said, I'm not sure it will clean off heavy corrosion without some mechanical help.
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The 'best' method or even just 'good' methods has been subject of debate.
Here's a couple of the threads with a variety of approaches
https://www.forabodiesonly.com/mopar/threads/cleaning-bulkhead-connectors.446706/
https://www.forabodiesonly.com/mopa...either-side-of-the-fw.492880/#post-1973479654

Some others may have experience with how far the MSD can be mounted. I've been told that inside on the firewall was occassionally done. No direct experience myself. Heat would be my concern. Others may have insight.

If the ammeter battery wire is otherwise in good shape, then splicing on to it is a reasonable approach. That will let you keep the heavy factory ring terminal. I found the most difficult terminal crimping was onto heavy wire diameters (12 gage and 10 gage) with ring terminals. Some of it had to do with the ring terminal thickness I think.

Yes lots to think about.