Electrical 87-89 Dash Harness

Southport2014 · Nov 5, 2015

I cant figure this out. Car will start with ley all the way up when i jump selonoid.
Thats the only way it starts. Never encountered this until i switch the harmess out.

90sickfox · Nov 5, 2015

Sounds like either the neutral safety switch or the clutch switch isn't wired up. You can tap into the wire ( red with blue stripe...I think) from the ignition switch in the column to the solenoid. The neutral safety switch harness runs through the trans tunnel by the shifter.

Southport2014 · Nov 5, 2015

Do you have a diy. For this man ? Whats the neutral safety switch look like. Because before i did this i never had to use the clutch to start thr car

Southport2014 · Nov 6, 2015

Ok well on my selonoid i have 2 wores on the side closest to the battery. Om the diagram ot shows one going to it . Whoch one is the one that should be on it

Southport2014 · Nov 6, 2015

That problem is solved. Thamls everyone for the help. THE PROBLEM WAS THE CLUTCH PEDAL SWITCH. I FORGOT TO PLUG THE RELAY JUMPER CONNECTOR BACK IN. Now on to the new problem . The dang turn signals will not work. Also the blower will not work. The passenger side flasher works though

jrichker · Nov 6, 2015

Check the fuse for the blower.

Diagrams courtesy of Tmoss & Stang&2birds

Fuse box layout

Mustang 5.0 Lights and Radio schematic, by TMoss:

Southport2014 · Nov 7, 2015

Fuse was good.

jrichker · Nov 7, 2015

Did you plug the fan control wiring harness into the HVAC control panel and into the blower speed control resistor pack that lives in the A/C duct?

I highly recommend that you spend some time viewing Mustang FAQ - Wiring & Engine Info . That's where most of the diagrams and information you need can be found.

Diagrams courtesy of Tmoss & Stang&2birds
A/C and heater wiring

HVAC vacuum diagram

Southport2014 · Nov 8, 2015

Do you know plug is for the turn signals on the dash,harmess

jrichker · Nov 8, 2015

I sent you a wiring diagram for your car. That is your first and best reference.

Southport2014 · Nov 8, 2015

I got the flashers to work still no turn signals or ac blower. Checked fuses and there good. Doesnt make sense because all worked good before.

Southport2014 · Nov 9, 2015

Do you think this is the problem

Southport2014 · Nov 9, 2015

I have power to the maltofunction swotch but no power out from it

90sickfox · Nov 9, 2015

Good ole burned up ignition switch harness. So nothing on the switch works...no wipers...turn signals...high beams ?

Southport2014 · Nov 9, 2015

Only thing not working is turn signals and ac blower

Southport2014 · Nov 10, 2015

Well i have power from the fuse box to the switch. I dont think i have power from the switch though.
I tapped in the wires for the turn signals and i got them to come on. So do you think its a switch? I also had the blower working for a moment when i was messing around woth the steering coloum

90sickfox · Nov 11, 2015

Sounds like theres a bad connection somewhere. How many power feeds are you getting at the multifunction switch ? Jrichker gave solid info and I believe the wipers and turn signals get separate power feeds to the switch. These cars are known for power feed issues because of the ignition switch harness.

Southport2014 · Nov 11, 2015

Im sorry for all the questions im just so ready to be done with this wiring. I got the blower to work it ended up being a pigtail ground. Jist the turns i cant seem to get to work to be honest i dont know exactly what plug the turn signals are on

Tbrown · Sep 23, 2018

jrichker said:
PM me your email address and I will send you a complete Ford Factory 89 Mustang electrical diagram set. The zip file is 2.5 MB and is too big to fit through Stangnet's email gateway.

89 Mustang wiring diagrams zip package–

They are in a zip file format to reduce the size of the package. If you don't have Windows 7 or Windows 8, you’ll need WinZip or other Windows archive tool to extract them from the zip file.. See MajorGeeks.Com - MajorGeeks - Download Freeware and Shareware Computer Utilities for a free download.

The diagrams show the location area and the connectors are drawn to the same shape as those in the car.

You will need the Adobe Acrobat viewer which is also a free download – Adobe Acrobat Reader DC Install for all versions - Adobe Reader download - All versions

Please send me the complete Ford factory 89 Mustang electrical diagram set to tbrown3256@gmail.com. Thanks so much

reddragons · Sep 24, 2018

I'd take a look at these three area's to start. Some of this wiring looks suspect at best.
1. Your starter to solenoid wire looks like it's hanging on for dear life. You might want to redo this connector. Possibly with a new starter to solenoid wire. Or a fusion slug (solder prepacked).

2. I'd redo, or buy a new coil repair plug. --> Repair Connector

3. This is part of the ground for the computer... It looks, well, i'm not really sure what it looks like. But I am sure it should be checked.

LUK!

Electrical 87-89 Dash Harness

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