Topic: 69 Mach 1 Dash Wiring Harness @ Firewall

[G Wood]

Can anyone post a photo of the dash wiring harness exiting on the engine side of the firewall. I am trying to sort out my harness and I can see the plug with the wires and how it fits but I have a cloth colored wire that looks like it also goes through the firewall in the same location. I am waiting for my wiring diagram in the mail but thought I'd ask in the meantime.

[midlife]

I presume you're talking about the grommet firewall hole with the gauge, wiper, and NSS/BU plugs?  If so, I know of no cloth-covered wire originating in the underdash harness, nor is there room outside of the grommet to pass another wire...

A picture of what wire you're talking about would be most helpful.

[G Wood]

Thanks for the response, I took another look and was able to sort it out. You are correct.

Another issue is that from the plug forward (into the engine bay), I have a splice going from a red wire near the rubber grommet and spliced into a green in the wire bundle. Any thoughts on what needs to happen to correct this as I don't see a red wire to reconnect to nor do I see a green coming out of the grommet side that I could splice back to. Not sure if this makes sense but maybe the photo will help?

[Stangly]

I hope this helps, it looks like your harness has been worked on by somebody not qualified.  I would recommend Randy at Midlife, he can go go through your harness and getting it proper working order.  He went thru my underdash harness and the tailight harness.  I replaced my headlight feed because the wiring was very brittle, you could here the wires snap when bent.

[G Wood]

I think the issue in my photo is the only problem I have. I may have to contact him if there is no other posts.

Thanks

[midlife]

Yes, you are missing the gauge plug: oil, coil, and water temperature on the main harness.  Your green wire is for oil pressure but that isn't the correct color, so your gauge harness is incorrect as well. 

[G Wood]

Thanks for the feedback, looks like I'll be pulling it out and sending for a rebuild as suggested.