The first picture I believe is the washer pump. Left front yes. The forth picture of the single pin I believe is the hood lite. Mine had that connection but no lite. Deleted it from the harness

 

The last picture I remember the connectors. I wanna say the black one is headlamps and the gray is for fogs??? Take a look at the wiring diagrams that u have and see what the wires u have going into the plug correspond to

 

Thanks for the reply brother. The problem is I can’t seem to find a diagram for this harness. Everything is either the engine harness or under dash harness. The few I could find that kinda seem close have totally different wire color combinations than I have

 

Was it originally a V8 car or a 4 cylinder? I'll see if I can find u wiring diagrams today when I get to work

 

Left pic: Washer fluid pump
2nd from left: Washer fluid pump test plug. 12V here will run the plug
middle: Brake low fluid sensor plug
two pics are right are just showing the washer fluid test plug again

 

Ok thanks so the 2 prong black rubberized looking plug is for the washer pump, and the 1 slot gray plug is for the washer pump test.

I’ll post a better pic of the flat connector I’ve been trying to figure out, maybe you guys know it.
And for the second pic I’m just trying to figure out the connector with the green rubber seal inside, o2 sensor maybe?
Thanks again guys

 

The flat connector with the purple/yellow wires would be the brake fluid level plug for the MC reservior.

Would need wire colors for the gray 3-pin plug. I believe that is for the A/C compressor connection is a 2-pin wire.

WHuch plug on this diagram do you think it is and can you tell me the wire colors? I also have an '88, but unfortunately all my wiring is tucked so I can't look for myself.

 

The flat connector with the purple/yellow wires would be the brake fluid level plug for the MC reservior.

Would need wire colors for the gray 3-pin plug. I believe that is for the A/C compressor connection is a 2-pin wire.

WHuch plug on this diagram do you think it is and can you tell me the wire colors? I also have an '88, but unfortunately all my wiring is tucked so I can't look for myself.

View attachment 1106083

Looking at that diagram is looks like my gray round connector with the 8 pins must be c403 for the oil pressure and coolant temp dash gauges, or c201 for the tach, safety switches and starter relay. I’ll have to check the wire colors when I get home to confirm which one. From what I see online c403 is white/red, red/white and white/pink, and c201 is green/yell, red/green, red/blue, white/pink, blue/yell and green/pink.

I’m still trying to figure out the 3 prong connector with the green seal inside. I’m thinking maybe it goes to the distributor harness. I wouldn’t be using some of these anyway with the Holley terminator kit on the ls swap.

 

I don't think the 3-pin connector is for the dist.

Is this a 4 cyl or V8 harness?

 

I don't think the 3-pin connector is for the dist.

Is this a 4 cyl or V8 harness?

v8 harness. It could be for something to do with the A/C. Won’t know until I get home tonight and write down all the wire colors for the plugs I still need to identify

 

Alright well now I’m sufficiently confused lol. i took pics of the wires going to my 8 pin connectors and they dont match any diagram ive been able to find online. some wire colors match one connector but then my connector has some wire colors that match a totally separate connector.

My black 8 pin has dark-green/white, white/pink, orange/yellow, blue/yellow, white/red.
EDIT: tracked down the above connector to be Connector #201
Green w/ White - Trans Speed Sensor
White w/ Pink - Starter Relay
Orange w/ Yellow - Trans Speed Sensor
Blue w/ Yellow - Trans Neutral Sensor
White w/ Red - Oil Pressure

Just the below connectors left:

-One loose wire that's red w/ gray (connector is missing, so i have no clue what it goes to)
-One gray connector that's black w/ tan (cant find this one in any diagram)
-That 3 pin connector with the pins in a triangle and that ones black w/ yellow, light-green w/ red, and dark blue (cant find this one in any diagram)
-One gray connector that has 2 wires both black w/ white (maybe fuel pump self test?)

I'll attach pics. I feel like ive looked through 100 diagrams with no luck lol.

 

The single pin with the broken wire (black/orange) is the hood light.

the two-wire, single pin (black/white wire) is the washer fluid test port

the large 8-pin connector by the booster should be C403. It’s where the dash harness coming from the drivers side firewall connects to the ECU harness coming across the pinch weld.

The loose red wire I’ll need to check, along with that 3-pin connector

 

Thank you very much, super helpful!

 

The two 8-pin connectors on my car and the hood light. Unfortunately the wiring tucks into the fender so unable to get more pics. I’ll have to search my old pics to see if I can locate the 3-pin connectors.

 

I believe that red wire should be a red/lt blue. If so, that’s the trigger wire for the starter relay that connects to the top little post on the solenoid and is what energizes and connects the two sides

 

awesome thanks guys,
so i should get power to that wire only when the key is turned past run to start right?

 

Found the three pin connector.

Appears I have it connected and running to the front of the car. I would imagine this needs to be the headlight harness but can’t really check now.

it can also be the ac harness. Let me dig through some more pics

You can also see my red wire with the yellow ring connector. That’s my trigger wire for the starter relay

 

Correct. 12v to ground when key turned to start

 

I’m 95% sure that the 3-pin connector goes to the headlight harness. It’s either C209 or C402.

I found some pics where it appears this is where I’m connecting it to. It’s def not the ac harness as I have a pic of that plug going to the compressor and can see it’s 2-wire.

Looking on eBay at 87-89 headlight harness, I also see the 3-pin mating connector.

Pardon Our Interruption...

 

When i was doing tracing with the multimeter, I found a black 8 pin connector that had all the right results on the multimeter to be the signals, highbeams, etc to the headlight harness and i think that's c402 on the diagram. ill post a picture here alongside the 3 pin connector. unless maybe the 3 pin is headlights and possible, side markers whereas the 8 pin is signals, highbeams, hazards

 

In the 3-pin harness….

Light green/red runs from alternator regulator to the warning light in the cluster. That means the mystery connector is C402.

C209 carries the headlights, parking lights and turn signal.

haven’t ID the other two wires in C402 yet. The ford manual lists it as a 4-pin connector but it’s clearly not.

 

Do you have the headlight harness?

 

C209 is the 8-pin connector according to the EVTM. C402 is listed as 4-pin

Only place i can find C402 in the wiring diagram so far. So that 3 pin should conenct to a 3-pin on the headlight harness and run out to the alternator.

And here's where I found C209 connections. I found 6 wires

 

C209 is the 8-pin connector according to the EVTM. C402 is listed as 4-pin
View attachment 1106146


Only place i can find C402 in the wiring diagram so far. So that 3 pin should conenct to a 3-pin on the headlight harness and run out to the alternator.

View attachment 1106147


And here's where I found C209 connections. I found 6 wires

View attachment 1106148
View attachment 1106149
View attachment 1106150

Thank you very much, this is exactly what i needed, the final piece of the puzzle.

So after looking at the diagrams you sent, the 3 pin connector is part of the IAR assembly. I looked up pictures of the stock alternator harness online and found that the alternator connections go to one connector that plugs into that 3 pin connector. The other connector, the black 8 pin, runs the turn signals, headlights, etc. like you said.

The loose red wire that I thought was red/gray is actually red/lt blue like you suggested, which should be the trigger for the starter. When i get home from work ill check it with the multimeter for 12v while cranking.

All the other connections we've established already.

Thanks again for all the assistance guys, it was truly helpful!

 

BTW there's a copy of the 1988 EVTM here. You may have to join up to download the PDF however. It's what i used for the above shots.

1988 Mustang EVTM | Mustang Forums at StangNet

It's 99% similar to the 1989 EVTM. In comparing them, i've only found one or two small differences. the '88 version does show the mass air wiring.

 

BTW there's a copy of the 1988 EVTM here. You may have to join up to download the PDF however. It's what i used for the above shots.

1988 Mustang EVTM | Mustang Forums at StangNet

It's 99% similar to the 1989 EVTM. In comparing them, i've only found one or two small differences. the '88 version does show the mass air wiring.

Hey trying to download this but it says I don’t have the permission for it

 

I checked the red/blue wire and don’t have 12v in run or cranking positions, but i think it’s just disconnected somewhere up under the dash because I do still think it’s the starter trigger

 

There's a few connections along the way for that wire from the iginition. If you don't have the trans harness hooked up or the clutch switch hooked up then it won't work.

Wire 33 and 32

 

Gotcha, makes sense. I forgot to bypass the clutch switch when i tested it. Ill test again tonight. Thanks again!

 

I have a paper wiring diagram for all of my cars. Best $$$ i ever spent.

 

Thankyou! Ended up buying the USB!