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    #16
    The steppers can get sticky. The one in my Mark VII lags real speed by about 2 needle widths in either direction. Accelerating it reads slow, decelerating it reads fast. Works out to about 5mph off. I've tried lubing it and its slightly better but I think the rear bushing in there is gummy and there isn't any access.

    The odometer in the mark was also not running when I got it. There was a capacitor across the power feed to the motor which had blown up and was keeping the motor from running. One new cap and a drop of oil in the motor and it runs fine now.
    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC grandpa spec white and cranberry

    1984 Lincoln Continental TurboDiesel - rolls coal

    Originally posted by phayzer5
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

    Everything looks like voodoo if you don't understand how it works

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      #17
      I haven’t fully installed it so I’ll pull it again. Is there a way to test the stepper motors? It’s really strange that everything worked until I pulled the cluster the first time probably about a year or so ago. Everything looks ok but I’m no electrical engineer. Maybe a power surge while reinstalling it did something, who knows.

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        #18
        I checked the continuity for the speedometer stepper motor and compared it to the other two. It has much higher resistance. I’m thinking it’s the stepper motor. Anyone know of a source for these? If I can find a cheap enough cluster I’ll pick it up and swap the whole board over.

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          #19
          Originally posted by 87GrandMarq View Post
          I checked the continuity for the speedometer stepper motor and compared it to the other two. It has much higher resistance. I’m thinking it’s the stepper motor. Anyone know of a source for these? If I can find a cheap enough cluster I’ll pick it up and swap the whole board over.
          Have you checked EBAY? If nothing doing there, it may be a junkyard item only.
          What I Own: 1993 Mercury Grand Marquis GS
          What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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            #20
            I have several gauge clusters,(most just need new gears). $75 shipped each. WagonMan
            Last edited by WagonMan; 03-19-2025, 07:06 PM.
            89 Colony Park
            90 Colony Park
            70 HEMI Daytona Convertible

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              #21
              I was able to snag one for pretty cheap right after I posted. Pete ill keep you in mind if this one doesn’t work out. Thinking about it more, I think I had the car in accessory when I pulled the cluster the first time. I bet I fried something.

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                #22
                I swapped the board over from the new cluster and now the speedometer and odometer don’t work at all. It’s out of a 93 or 94 mgm. Either it’s not compatible electronically or something is dead. I’m pretty irritated right now.

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                  #23
                  That's entirely possible. The traces may be different. Put them both next to each other and see if things run to different places from where the connectors go to it.

                  Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                  rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

                  Originally posted by gadget73
                  ... and it should all work like magic and unicorns and stuff.

                  Originally posted by dmccaig
                  Overhead, some poor bastards are flying in airplanes.

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                    #24
                    I swapped the gauges out of my 90 onto the “frame” (including the 93-94 rear plastic circuit board) of the newer cluster. My train of thought is maybe the printed circuit board would work with the corresponding frame. Well the trip odometer works but the speedometer and odometer still don’t work. The pins are slightly different between the two, I’m thinking that could be the issue.

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