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Unread 06-03-2007   #1 (permalink)
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Default Wiring problem with starter relay on 1986 Mustang 5.0

I messed up the wiring to my starter relay on my 1986 5.0L.If anyone has access to a color wiring diagram(I can't make sense of the one in my manual)or even better email me a picture of theirs(it's where your positive battery cable goes)I've already changed my starter and solenoid and just want to make sure my relay is wired correctly(never argue with your girlfriend when you're wiring)before I try replacing my ignition switch.Thanks so much,Scar
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Unread 06-03-2007   #2 (permalink)
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You're gonna want the starter cable going to one of the large posts, and I don't think it matters which one. You want everything else, including the battery cable, going to the other large post. The red wire with the push-on connector goes to the small post, which is labeled "S".
Did you change to the small-case high-torque gear reduction starter? If so, it needs to be wired differently.
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Unread 06-03-2007   #3 (permalink)
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No,it's pretty stock so I just used a standard starter.The new starter should be the same as the old one so the wiring shouldn't change,I think(well,this coming from the numbnuts who screwed up the wiring in the first place).But I've seen a similiar thread that said the same thing so I'm going to run out and try that now,thanks,you da man.
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Unread 06-03-2007   #4 (permalink)
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Good luck bro. And if you end up with any accessories which don't work, go back and look for any wires with ring terminals which might've been hiding, and not gotten hooked up. There should be at least two other wires besides the battery cable, which go to the post with the battery cable.
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Unread 05-19-2008   #5 (permalink)
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Default Wiring Problem the 14 gauge fuseable link fried 1986 5.0

I have about the same issue as above I plugged in the battery (backwards) and it fried the 14 gage fusible link that goes from the Starter Relay to ???

I am very very wet behind the ears and this is a first for me (car repairs in general, but I learn quick).

My question is should I start by just replacing the fried wire? And then attempt to plug the battery back in or is this a bigger problem? Also considering that it fried fast will I need to go through and replace all fuses?

Can anyone provide me with a quick checklist (and some good pics of how it should look)of things I need to ensure are connected fully before I do indeed plug the battery in again?

Say Fuses, battery ground, hood light, etc?
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Wiring problem with starter relay on 1986 Mustang 5.0-pointing-2.jpg  Wiring problem with starter relay on 1986 Mustang 5.0-pointing.jpg  Wiring problem with starter relay on 1986 Mustang 5.0-img308.jpg  
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Unread 05-19-2008   #6 (permalink)
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color diagrams can be found here:

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Unread 05-19-2008   #7 (permalink)
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I picked up a new New 14GA Fusable Link. I still need someone's help with a visual of how the stock configuration looks:

Basically:
  1. Where the battery Terminals go (positive and negative) (I know I know) with pics (if you can)
  2. What wires need attached to the Solenoid (PICTURES PLEASE)
Like I said I am completely new to this and the more descriptive the better I just want to make sure when I re-Connect the battery I wont fry anything else

Quote:
Originally Posted by zodiac_86noob View Post
I picked up a new New 14GA Fusable Link. I still need someone's help with a visual of how the stock configuration looks:

Basically:
  1. Where the battery Terminals go (positive and negative) (I know I know) with pics (if you can)
  2. What wires need attached to the Solenoid (PICTURES PLEASE)
Like I said I am completely new to this and the more descriptive the better I just want to make sure when I re-Connect the battery I wont fry anything else
So I replaced the fusible link last night grounded the battery, attached the hood light wire, and one other set of wires, (positive) battery cable and as soon as I touched the positive cable the fuseable link (grn 14GA) starts to fry (smoke burn etc.)

Any suggestions? Am i missing anything?
Attached Thumbnails
Wiring problem with starter relay on 1986 Mustang 5.0-img308.jpg  Wiring problem with starter relay on 1986 Mustang 5.0-img310.jpg  

Last edited by EagleAutosports; 05-20-2008 at 10:54 AM. Reason: Merged 2 posts
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Unread 05-20-2008   #8 (permalink)
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Quote:
Originally Posted by zodiac_86noob View Post
So I replaced the fusible link last night grounded the battery, attached the hood light wire, and one other set of wires, (positive) battery cable and as soon as I touched the positive cable the fuseable link (grn 14GA) starts to fry (smoke burn etc.)

Any suggestions? Am i missing anything?
That wire is gounding somewhere. You need to trace the wire until you find it.
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Unread 05-20-2008   #9 (permalink)
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Yup, you have a ground problem and you should start tracing the wires and cables.
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Unread 05-22-2008   #10 (permalink)
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Default 86 GT 5.0 battery cables backwards = fusible link fried

Okay, so still learning on this one... I followed the wires past the 14GA fusible link that sits at the solenoid and it appears that past the rubber piece (see the pic below) nothing else is gone / fried / dead.

My question is as long as I cut out that "rubber stopper" and wire the yellow and (orange / black) wire to the fusible link I should be okay right?

Can anyone give me some pointers as to precautions,
Is there any way to test it before plugging in the battery again?

Again I initially plugged in the battery backwards (- to + and + to -) and the 14 GA fusible link went first.

What else should I test before I re-connect the battery (correctly this time )
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Unread 08-08-2008   #11 (permalink)
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Default starter relay wiring problems

I lost my remote on my 87 mustang 5.0 for the alarm system. I disconnected the alarm box but the key does not engage the starter. Is something still disconnected?
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Unread 08-09-2008   #12 (permalink)
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Default Alarm

I'm no expert,but maybe your alarm has a feature that won't let the car start if someone pops the hood and tries to unplug it and steal the car.It probably kills the power.I think you'd have to completely remove any wires going to the alarm,and find your remote or get a new one,peace,Scar
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Unread 08-31-2010   #13 (permalink)
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I have changed the moter from 1986 5.0 to a 1993 3.3,problem is the car starts but wont shut off.
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Unread 08-31-2010   #14 (permalink)
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Quote:
Originally Posted by bjoe427 View Post
I have changed the moter from 1986 5.0 to a 1993 3.3,problem is the car starts but wont shut off.
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