BenzWorld Junior Member
Date registered: Nov 2014
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Wire harness replacement - Adding some fuse protection
I have a W111, not W108, but I plan to re-build my entire harness. I've found the right wires and sheathing at 4rcustom.com and I have practiced taking apart and re-soldering the banana plugs that are in the connectors.
While I am really working to stay original on the car, I am going to add some fuses in my re-work.
W111s had no over-current protection between the starter (really, the battery) and key-switch or the light switch. Both of these switches are runs of about 8' with 10-gauge wire and completely bundled with dozens of other leads. Worse, these switches connected at least 10 more leads that run to the OEM fuse panel for several more unprotected feet...some as small as 16-gauge.
I shudder to think the hot terminal (#30) on the light switch is hot to the battery. A crack in the switch housing or a piece of conductive debris could cause a dead-short...and likely a fire in the harness.
I plan to mount a fuse-block low on the firewall behind the starter such that I can add some protection to these leads and then beef up all of the leads between the key and light switches and the OEM fuse panel. I hope I won't get docked too many points at Pebble Beach.