Looking for some help with 4 connections. I have the wiring diagrams but feel like I am missing something. Pics attached of the 4 wires I cannot figure out what they go to.
Ok, here goes, #1 I believe is for the radio (dual connector), and the single i’m not sure here , but heater circuit possibly
#2 That is for that distributor system for 70 emissions
#3 XR-7 clock
#4 is for the tachometer ( dual w/ wrap on wire) Not sure on 3 wire connector above it
Believe the single green is the AC compressor clutch power
Is it by any chance a power window or rear defogger car? The single green wire is part of the AC clutch wiring and the length makes me think it goes down to the micro switch on the climate control selector. #2- I agree emissions connector, #3 being 3 wires, I am thinking the blower speed resistor. #4 agree the red wires is for the tach, the 3 pin connector looks like a power window connector.
Adding to the post with another pic. I have a
green connector that I think is left empty but don’t want to put the dash back in until I could ask some folks. The dash has been out 13-14 years so I don’t remember.
That connector is for a clock, and if on a Mustang, the map light also plugs into it.
…and #3 above is actually the blower resistor plug
The top 3 wire connector in #4 is the other end of those same blower resistor wires that plugs into another harness that goes to the actual blower switch on the HVAC controls for cars with AC
The black connector in the pic is for the clock. I’m referring to the green connector that has two female holes. Oh and '70 Cougar.
It doesn’t look like a connector in your pic, but I’m pretty sure that second green 2 pin connector is where the harness to your map light above the glove box plugs in. Is that right Midlife?
I have that pic. Maybe I’m looking at it wrong. Here is another pic.
The one green connector that is plugged into the other green connector has two male plugs. The other green connector has two female slots. I thought the map light plugged into the black connector I have sticking up. It has a brown wire with a yellow stripe just like the map light. There’s not another plug with two male plugs which made me think it wasn’t used.
I just found it on another schematic. It is for a " to conven. check" so it is left blank.
Thank you for the help guys. Very much appreciated.
Ok, yes that’s right. Good find! So your car must be an XR7 with map light switch on the middle dash panel. My schematic was apparently for standard Cougar with map light switch on the map light assy.
I downloaded a 1970 mustang and cougar electrical drawing from somewhere…maybe wccc. It had cougar standard and XR-7 but didn’t differentiate. I had looked at the one you posted a lot then I found the other one which turns out was for the XR-7. I need another pic when you have time. I need a pic of the head of the ground screw for the horn. Thanks for the help.
The horns both ground to chassis at their mounting bolts, Is this the bolt you need a pic of?
Sorry about the delay. I tried to answer from my phone this morning but was logged out and couldn’t remember my password. The ground wire comes up from the marker light area and attaches between the hood support/bumper and the horn in the middle on the RH side. Thought maybe it was the same as the hood ground screw.
Ok, I see it. Looks like it’s the ground for the front lights. It’s a 1/4” head sheet metal screw about 5/8” long.
Can you see if it’s self taping? Can you look at your copper hood ground on the cowl and see what that screw looks like? The amk screw I have for the hood ground has two circles and a triangle on the head. The head on yours looks blank. I guess it could be any 1/4 x 5/8 screw. Thank you Craig
Different. 
LOL. Thanks again bro.