"Idiot Light" Question

Discussion in 'Technical' started by TeeEl, Jul 7, 2025.

  1. TeeEl

    TeeEl Senior Member

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    Location:
    Colorado
    Vehicle:
    '73 Ford Maverick Resto-Mod (Home-made "Pony Car")
    Two years ago, I bought a reproduction instrument cluster circuit board for my Maverick. Well I finally got around to installing it. Everything works except for the Temp light. It was working with the old circuit board. It does not illuminate with the key On or in "bulb test" mode. I know the bulb is good, because when I ground the sending unit wire directly, the light comes on with key On, but when the wire is connected to the sending unit, the light does not illuminate. It appears that the only light illuminating in "Bulb Test" mode (cranking the engine) is the Brake light. 'Any idea what could be the cause for this?
    Did I get a bad circuit board? I have a Temp gauge, so I don't need an "idiot light", but I would really like for everything to function, especially since this circuit board is new...
     
    Last edited: Jul 8, 2025

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