Alex,

I've run replacements for the oil sender wires and the small red one around the right fender and across the firewall, but considered the output wire best left where it runs. My reasoning was the large gauge and strand size would not last long if parts were attached to the motor and other parts attached to the body.

The original route does seem silly when you see how poorly it was protected, relying only on that thin PVC jacket and sharp metal cable clamps. I think you can improve that with new sleeving and rubber covered or plastic clamps and still keep the wire solid to the motor with the exception of the rubber accessory bushings on the alternator.

I'm not sure of the metric gauge size of that wire, but mine all look like something a bit fatter than 8 AWG.
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Art Benstein near Baltimore

My 86 has the small wires- oil pressure and alternator warning lamp- routed along the right side of the engine compartment, to the grey connector. Note that the connection pins are kind of specialized- you'll need to splice the originals or (good luck) find a proper terminal somewhere. A well-stocked dealer should have a bin full of terminals in the parts department. The big wire is best left alone if it can be saved- heat shrink tubing works really well on it. Also inspect the ring terminal for cracks- mine broke about 3 weeks ago, it was the original terminal, and fortunately the wire kept it right in place against the bolt. However, it could have caused a FIRE! That's a big, unfused wire right from the battery- please take every precaution when working on these wires.
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Rob Bareiss, New London CT ::: '86 244DL- 215K, 87 244DL- 230K, 88 744GLE- 198K, 91 244 180K

Yeah, I don't like the wires going under the pulley. Especially in black sheathing that you can't see through. I rerouted the thin oil pressure sender and the other thin alt. wire along the firewall and approached from the passenger side. The thick alt. wire I wrapped in clear plastic tubing. But I didn't reroute it.

But then again, I did this when I redid the wiring harness because it was in bad shape. Now the individual wires are covered in a clear plastic (teflon(?)) sheath.