Help with some dash wiring

Discussion in 'Electrical Systems' started by Adams, Dec 14, 2020.

  1. Adams

    Adams Veteran Member Lifetime Gold Member

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    Two questions on my 71 Z:
    1. This short brown wire (pic attached) off the harness from the fuse box, Brown usually means a light but I don't have any missing light connections that I know of? I already have a light brown wire that goes to the e-brake switch.
    2. Don't seem to have a wire to the clock in the M&H harness. They are usually pretty good about having everything. What color is the wire and does it have a single female connector spade, like the back of the clock? What color is it, because I don't see it in my wire diagram?

    Thanks
     

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  2. xten

    xten Veteran Member

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    Maybe put a test light to it and see when it gets power? Not sure, but I think mine was for the driver's side foot well light. Test light on mine would only come on with a door pin switch, or if the H/L switch was turned all the way to the left (counter-clockwise)
     
  3. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

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    Does your 71Z have factory ac? AC wiring is not shown in the electrical schematic. Could be a wire for an accessory that you do not have. I have such a wire (not the same color)
     
  4. Pierre74LT

    Pierre74LT Member

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    i think it is the power for the heater fan
     
  5. Bills69

    Bills69 Veteran Member

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    on a gauge dash brown wire was for the tach ?
     
  6. Adams

    Adams Veteran Member Lifetime Gold Member

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    I will look into this. Might be a good call. The back of the tach is on the circuit board but I am not sure how the signal gets to the harness plug on the back of the cluster housing.
     
  7. 1978 Z/28

    1978 Z/28 Veteran Member Gold Member

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    I am just wiring my Camaro by the picture it looks like the heater wire download painless wiring manual. from their manual.
    Brown: 14 gauge wire, printed #904 HEATER SWITCH POWER INPUT. This connection will be a 30 amp, ignition switch power source, from the A/C-HEAT fuse on the fuse block. This wire can be seen in the Accessory Schematic on page 80 and also in the Heater Only Schematic on page 67.
    upload_2020-12-16_21-28-2.png
     
  8. lapedr

    lapedr Veteran Member Gold Member

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    It goes to the heater/AC control panel, if yours is like my 72, its there even if the car has no AC. I wondered about this also so I traced it back to the fuse box using an ohms meter
     

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