Cluster removal electronic questions

Discussion in 'Electrical & Stereo' started by RichV, Apr 20, 2015.

  1. RichV

    RichV Well-Known Member

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    So want to remove the stock gauge cluster in my 94 GT. Going with some Autometer gauges, and cleaning it up a little.

    When I pull the cluster out, the alternator stops charging. I can see on my voltage gauge it drops from 14v to 12v. Plug it back in, charging is normal. What do I need to make the charging system work without the stock cluster connected?

    The second thing, and the only reason I've kept the cluster long, is the fuel gauge. I have a Autometer that works with the Ford resistance and would be ideal to just pull the wires at the cluster plugs if possible.

    Anyone done either mods? I'm not pulling up detailed enough wiring diagrams. I'm going to dig some more in my Chiltons, but I bet someone has done both of these.

    Thanks!!
     
  2. RichV

    RichV Well-Known Member

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    Found this today:

    2 wires to jumper for the alternator to charge!!

    [TABLE="width: 403, align: center"]
    [TR]
    [TD]Year
    [/TD]
    [TD]Harness #
    [/TD]
    [TD]Pin #
    [/TD]
    [TD]Wire colors
    [/TD]
    [TD]Circuit description
    [/TD]
    [/TR]
    [TR]
    [TD]94-95
    [/TD]
    [TD]C250
    C250
    [/TD]
    [TD]6
    7
    [/TD]
    [TD]R/LG
    LG/R
    [/TD]
    [TD]Ignition switch feed
    Charge indicator
    [/TD]
    [/TR]
    [TR]
    [TD]96-98
    [/TD]
    [TD]C250
    C250
    [/TD]
    [TD]10
    11
    [/TD]
    [TD]LG/R
    R/LG
    [/TD]
    [TD]Charge indicator lamp
    Power hot in start or run
    [/TD]
    [/TR]
    [TR]
    [TD]99-01
    [/TD]
    [TD]C250
    C250
    [/TD]
    [TD]5
    11
    [/TD]
    [TD]LG/R
    PK/BK
    [/TD]
    [TD]Charge indicator lamp
    Power hot in start or run
    [/TD]
    [/TR]
    [TR]
    [TD]02-04
    [/TD]
    [TD]C250
    C250
    [/TD]
    [TD]5
    12
    [/TD]
    [TD]LG/R
    WH/LB
    [/TD]
    [TD]Generator/battery ind.
    Voltage in start and run
    [/TD]
    [/TR]
    [/TABLE]

    Found it in a instructional diagram from Florida 5.0's gauge clusters.
     
  3. RichV

    RichV Well-Known Member

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  4. ttocs

    ttocs Legend

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    I am pretty sure if you look on the back side of the cluster there is a voltage regulator or something stupid that goes to the alt. Not sure if the charging light not being hooked up would cause a problem or not as the computer might see it as a bad warning light and shut it down.
     
  5. RichV

    RichV Well-Known Member

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    Fox clusters do the same thing. Uplugging it stops the alternator from getting a 'charge' signal. I'll try out the jumper from the above table and report back.
     
  6. ttocs

    ttocs Legend

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    I just got done rewiring my alternator under the hood because I will be running that big old bastard and an off board voltage regulator. I am not sure I HAD to hook up that wire but the regulator had the option so I did it.

    Now don't forget one of the big wiring rules that you never tap a wire with out testing it first. Obviously the power wire will show 12v on it and the other one you can probably switch to ohms and measure the resistance of the bulb.
     
  7. 87hurricane

    87hurricane Member

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    Rich, sorry I didnt see this sooner. I'll dig through some wiring diagrams at work today and let you know exactly what you need.
     
  8. RichV

    RichV Well-Known Member

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    Sweet! I just finished my cluster and will be installing it this weekend.
     
  9. 87hurricane

    87hurricane Member

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    Sent you a PM, pretty sure I've got everything you should need.
     
  10. RichV

    RichV Well-Known Member

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    Awesome! Appreciate it.
     
  11. mcglsr2

    mcglsr2 Well-Known Member SN95 Supporter

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    Sorry I'm late to the party RichV, been gone a little while. I started this thread on the Cluster stuff, don't know if it will help or if you even need the info anymore... :(

    Thread here.
     
  12. jjltthomas

    jjltthomas New Member

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