anyone know how ignitions work?

Discussion in 'Fox 5.0 Mustang Tech' started by OonDeanisS, Jan 9, 2007.


  1. OonDeanisS

    OonDeanisS Founding Member

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    So attaching r/b and r/g to the small red wire will do the trick as long as i have a diode on both of them? how does a diode work?

    thanks for all the help, how old are you guys? im 20
     
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  2. OonDeanisS

    OonDeanisS Founding Member

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    and what kind of diode should i use? i've never used one before.
     
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  3. seijirou

    seijirou Founding Member

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    A diode is a one-way check valve for electrical current. It only allows power to flow one way. It goes in-line with the wire. Wire it to allow current to flow to the coil, but not from it. I'm 25 :nice:
     
    #63
  4. OonDeanisS

    OonDeanisS Founding Member

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    sounds good, i just got it started!! but i did it with no power in start, just the red wire attached to my fuel pump toggle switch. So now can i just attach a new wire from the white/pink with a diode on just that?
     
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  5. seijirou

    seijirou Founding Member

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    Well the fuel pump needs to have power in both cases too, so using that power will work.
     
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  6. OonDeanisS

    OonDeanisS Founding Member

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    but my fuel pump loses power in start too and i dont know why so should i just get a wire from the w/p to the fuel pump with a diode on it? what kind of diode do i need?
     
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  7. seijirou

    seijirou Founding Member

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    Damn dude your wiring is ghetto fabulous.
    Just go to radio shack and tell them you need a diode for low current automotive applications. They'll hook you up.
     
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  8. jrichker

    jrichker StangNet's favorite TOOL SN Certified Technician Founding Member

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    The fuel pump should be relay controlled.

    [​IMG]
    EDIT: Relay & socket part numbers
    Relay Radio Shack Catalog #: 275-226
    Relay socket Catalog #: 55017871

    Igniton wiring...
    The red/green wire is hot in both crank and run modes, since it used to activate the EEC power relay.
    It goes to the small red wire on the MSD box. The wire wire fro the MSD goes to the distributor (green/yellow
    on the original wiring) The big read wire goes to a 20 amp inline fuse that connects to the battery side
    of the starter solenoid. The big black wire goes to a bare metal ground on the body.




    From the diagram...

    Diagram courtesy of Tmoss & Stang&2birds
    [​IMG]

    See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring http://www.veryuseful.com/mustang/tech/engine/

    Ignition switch wiring
    http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

    Fuel pump, alternator, ignition & A/C wiring
    http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

    Computer,. actuator & sensor wiring
    http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

    Fuse panel layout
    http://www.veryuseful.com/mustang/tech/engine/images/MustangFuseBox.gif

    Vacuum routing
    http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

    By the way, I'm 61 - old enough to be your grandfather... :D
     

    Attached Files:

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  9. OonDeanisS

    OonDeanisS Founding Member

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    well i got it to work by attaching the small red to the red/lt grn under the ignition switch, and by attaching the white/pink wire in the engine bay (which somehow was only hot during run) to the red wire as well, and it doesnt start when i turn it to run, but starts right up like a normal car. yessss. Only problem now is the brand new battery is dead.
     
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  10. 89streetbeast

    89streetbeast New Member

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    glad to hear you got her running man. think i was confusing more than helping :rlaugh: , but i tried. sounds like a big wiring fiasco you got there. a friend of mine had the same problems with his 89 when he went carbed, he ended up buying an hei dizzy so all he had was 1 wire to fiddle with.
     
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  11. OonDeanisS

    OonDeanisS Founding Member

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    thats ok, it was worth all the confusion
     
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  12. OonDeanisS

    OonDeanisS Founding Member

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    so the alternator only has the black and orange that turns into green and the white and black? i think the alternator is good because it stays running when i detach the battery, but its not charging the battery. is that green one the one that charges it?
     
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  13. jrichker

    jrichker StangNet's favorite TOOL SN Certified Technician Founding Member

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    There are two green wires in the alternator circuit.

    One is the dark green fuse link wire that connects the alternator power feed to
    the battery side of starter solenoid. If the fuse link blows, the alternator will not
    provide power or charge the battery.

    The other light green wire is the one that signals the voltage regulator to turn on
    because the ignition switch is on and the engine is supposed to be running. If it
    doesn't have 12 volts with the ignition switch in the run position, the alternator
    will not charge. This same light green wire also operates the battery signal light
    on the instrument panel.
     
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  14. OonDeanisS

    OonDeanisS Founding Member

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    what do u mean by the alt. power feed? where is this fuse? and if it was that fuse that blew, wouldnt the car shut off when i detach the pos. side of the battery?

    also, no 12v in run at the lt. grn wire means the alt. will not charge... [the battery?]

    thanks
     
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  15. jrichker

    jrichker StangNet's favorite TOOL SN Certified Technician Founding Member

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    :shrug: I guess I must be speaking GEEK or something. I never thought that my
    explanation was that hard to understand....:shrug:
     
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  16. OonDeanisS

    OonDeanisS Founding Member

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    well that really doesnt clarify it much. can someone else please explain to me what jrichker said?
     
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  17. seijirou

    seijirou Founding Member

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    Unless you can think of something else on your car that can take a charge, yes, it's the battery.

    The altrernator feeds power to your car. It uses a wire to do this. The power feed wire. It's the thicker wires that come off the alternator. Just before it reaches the battery side of the starter solenoid, it goes through a fuseable link. All a fuseable link is, is a thinner piece of wire than the rest of the wire it's connected to.

    If your alternator is not putting out any power, yes your car will shut off when you remove the positive battery cable. However, even if the alternator is putting out only 9 volts the car will still run. So it's not really a test of a good or bad alternator.
     
    #77
  18. OonDeanisS

    OonDeanisS Founding Member

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    oh, thanks. Whats the point of a fusable link? Sounds like i should have my alternator tested.
     
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  19. seijirou

    seijirou Founding Member

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    It has the same point as a fuse. Just a different method. Most would agree it's a very much less effective method.
    I agree, get it tested.
     
    #79
  20. OonDeanisS

    OonDeanisS Founding Member

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    so if theres too much current flowing through the little "fusable link" it will just snap?
     
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