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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » All gauges went dead on my 67 coupe

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    3/13/2025 12:27 PM  #1

    mustang stu
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    Registered: 4/15/2016
    Posts: 98

    All gauges went dead on my 67 coupe

    First time out this year, rotated the tires. I went for a road test it was all good, I thought it's nice day maybe I'll stay out  for a while. I looked at my gas gauge, it showed bone dry, I better head for the barn. Checking gauges, no oil pressure, no temp, no alt.  I'm thinking it could ,be the gauge voltage regulator, I did put a new one in, but that was over 25 years ago. With the key on or off no movement on any of the gauge needles. Am I looking looking in the right direction?  mustang stu

     

    3/13/2025 2:34 PM  #2

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,987

    Re: All gauges went dead on my 67 coupe

    Did you check the fuses?

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    3/13/2025 3:33 PM  #3

    mustang stu
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    Re: All gauges went dead on my 67 coupe

    Rudi   Yes I did, the owners manual  shows there is a fuse for the instrument lights. All fuses are good, all fused systems seem to be working. I had gauges working when I started driving, all of a sudden I didn't.     mustang stu

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    3/13/2025 4:45 PM  #4

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
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    Re: All gauges went dead on my 67 coupe

    Check grounds.
    On these old car’s faulty grounds are very common

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    3/13/2025 5:11 PM  #5

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,313

    Re: All gauges went dead on my 67 coupe

    Alternator gauge is powered separately from oil, gas, temp. Most alt gauges don’t register anyway, though.

    Pull the cluster and check for power into and out of CVU, plus ground wire continuity.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    3/13/2025 7:35 PM  #6

    mustang stu
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    Re: All gauges went dead on my 67 coupe

    Thanks for the info MS, you are 100% right on alt gauge. I guess I'll put the cluster out tomorrow, check the ground, see if I have power going into the regulator.   mustang stu

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    3/14/2025 8:02 AM  #7

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
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    Re: All gauges went dead on my 67 coupe

    FYI
    Power for the gauges is not fused and comes from the back of the ignition switch, wire # 297 (Black-Green).  The 297 wire is then spliced with #30 wire (also Black-Green) that goes to the CVU unit on the back of the gauge cluster.  

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    3/14/2025 12:11 PM  #8

    mustang stu
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    Posts: 98

    Re: All gauges went dead on my 67 coupe

    Latest update I pulled the cluster out, the ground looked clean. I checked the regulator, there is voltage going in, but nothing coming out on the other end. I did put a new regulator in when I restored the car, but the cars been on the road 26  years, how time flies. Thank to MS and all the other replies. mustang stu

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