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Hi Bill,
Your blog is awesome! I have learned a lot from all the reading. I do have a question for you, I just purchased a 1970 Mark and none of the dash gauges work except the speedometer. I have looked at the fuse block and all are intact. Am I up against a big challenge?
Thank you for any help you can offer!
Randy
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Hello Randy –
We are pleased that you enjoy the blog. The fuel gauge, temp. gauge and the oil pressure gauge are controlled by a unit in the instrument cluster area called the “Instrument panel Voltage Regulator or IVR. The amp gauge is separate and in the Mark III’s of this era these Amp gauges unfortunately never did work real well or move much even when new. Ford never really addressed this problem or offered a correction for the Amp gauge issue. To diagnose the other three gauges you will definitely need some electrical testing skills along with the correct wiring diagram. To honestly answer your question “am I up against a big challenge?” the answer very well could be yes for many owners or “do it yourselfers”. Many automotive electrical shops also lack the experience needed for this type of challenge. I would suggest that you obtain the correct manual and study the electrical and diagnosis sections and then decide if you are up to the challenge. If you decide to proceed please contact us for further advice or any manuals that you will need.
Sincerely,
Bill