where does this plug in - Ford Mustang Forum
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post #1 of 9 (permalink) Old 4 Weeks Ago Thread Starter
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where does this plug in

so i have bee tracing ignition wires and found this disconnected under dash. it has a short lead length of about 8 inches.it has the solenoid wire i am missing for power. it is a 1989 2.3 conversion to 302

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Last edited by OTHG_KT; 4 Weeks Ago at 01:43 AM.
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post #2 of 9 (permalink) Old 4 Weeks Ago
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I would see if you can find a color coded wiring diagram for your year & model. Then see what the red wire with grey stripe controls.I found this in an old Haynes manual:

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Last edited by kenv; 4 Weeks Ago at 11:29 PM.
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Red & grey on that page is at the top of the pic. Sorry it loaded sideways. The page shows that those wires go to many things down the left hand side of the pic the way it`s posted. Good luck. Try to copy & expand the pic if you can`t read it.

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post #4 of 9 (permalink) Old 4 Weeks Ago
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I dunno, in this lighting the wire insulation appears to be red with a lt blue stripe, not grey...

And that Haynes pic includes some '94-'95 specific info, which leads me to believe that it's from the '94-'04 book. Do we need a Foxbody-specific diagram here, or did Ford use the same wiring colors on Foxbodies and SN95s?

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Yeah, they could be red/blue & I did copy it from a SN95 manual, so I don`t know if it`s relevant.

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post #6 of 9 (permalink) Old 4 Weeks Ago
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Looks red/blue to me.It appears to be the harness that plugs into the clutch safety switch.If this is a T5 equipped car,this harness would need to be connected to the clutch safety switch to allow the ignition switch 12v starter voltage to reach the fender mounted solenoid at the small solenoid post.When the ignition switch is turned to the start position,voltage leaves the ignition switch,then passes through the clutch safety switch (if youve got the pedal pressed down) and runs on to the starter solenoid.However,if this harness isnt plugged in to the safety switch,voltage will never reach the solenoid to trigger the starter.(as an alternative though,a 5amp fuse can also be plugged into the harness plug to bypass the clutch safety switch.Its not recommended though) If you look at your solenoid,you should see the same red/blue wire.One of the red/blue wires at the harness plug in your picture comes from the ignition switch.One of them runs to the tfi module harness (to retard timing during crank mode).One of them runs to the starter solenoid.The 1st picture below shows the harness plugged into the clutch safety switch.

If this is an AOD equipped car,this harness either gets left disconnected or a jumper plug gets inserted into it.Unfortunately,I cant remember which?? The second picture below shows the harness jumper Im referring to.
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1991 Mustang lx
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post #7 of 9 (permalink) Old 4 Weeks Ago Thread Starter
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i figured out it was for the clutch safety switch, which is non existent. thank for all your responses. I have ordered a OEM electrical schematic book specific for this car. i also figured out the ignition wiring. thanks again to all who responded.
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post #8 of 9 (permalink) Old 4 Weeks Ago
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post #9 of 9 (permalink) Old 4 Weeks Ago
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Im not sure what wiring youve purchased so far,since this is a 2.3 to 5.0 conversion,but make sure you buy the correct o2 sensor harness that matches the ecu you're running.Failure to do this can cause ecu damage.As an alternative to buying a new harness (if the one you've got now is the incorrect one) you can simply relocate the looped wire to the correct plug position that matches the ecu type you're using.The following is a list of the combos.

Good= combo can be used with no issues
Bad= combo cannot be used without issue

Auto ecu + Auto o2 harness= Good
Manual ecu + Auto o2 harness= Bad
Auto ecu + Manual o2 harness= Bad
Manual ecu + Manual o2 harness= Good

If you use the manual to auto combo,the signal return trace on the ecu circuit board will get damaged when the clutch pedal is floored and the key is turned to start.
If you use the auto to manual combo,a no crank condition may occur.
If you use the auto to auto or manual to manual combo,youre good to go.

1991 Mustang lx
D.S.S. 342ci {10.5:1}
TFS 190cc + track heat
Lunati 61011 .549".565"
Pro-M 76mm maf
Jetronic 30lb inj
QA1 Coilovers
17" Weld ProStar XP's
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