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Thread: 87 CV dash light bulb issues

  1. #1

    Default 87 CV dash light bulb issues

    Searched, but couldnt find this problem.

    Pulled the cluster to replace some bulbs out. The low fuel, brake and one more on left of cluster didnt illuminate. (all other cluster lights fine). Pulled the bulbs, they are all good, but not illuminating. WTF?

    Is it a bad cluster? Contacts were clean, Flex circuit looked fine.

    Fuel level gauge doesnt work either. It is balls low "E". ? related Ill start a thread about the sender unit questions soon as well

    Thanks guys.

  2. #2

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    I had the same problem with my gas gauge when I first got my 87 mgm. It did move a tiny bit when I cycled the key so I suspected the float. Pulled the sender and behold the float was cracked and full of gas. I replaced it and all has been well since.


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  3. #3

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    Pulled the sender, float was cracked and full of gas. Also get no resistange change when cycling the float arm. Gauge doesn't move when grounding the sender plug harness with key on.

    Should there be voltage on harness plug of sender with key on?

  4. #4
    Beater gonna beat sly's Avatar
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    Default

    The clusters are known for getting small cracks in the traces. These can be fixed by using some of that rear defroster repair conductive epoxy. They also can have corrosion at the connectors and oxidized contacts don't make for good connection. Clean those up and it may fix the issue. Also, check the bulb holders to make sure they're still ok and have good continuity from the contact to the board to the bulb contact.

    As for voltage on the plug, With the sender disconnected, one wire should show voltage. I don't remember how much though. The other wire should reference ground when disconnected or look like a resistor to ground. Been a while since I've seen that schematic.
    Last edited by sly; 01-11-2021 at 12:22 PM.

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  5. #5
    The Brown Blob 87gtVIC's Avatar
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    Grab an EVTM and while on a bench you can easily test everything by applying voltages and ground where called for. Then once confirmed all works as should in the cluster you can test on the cars harness. Dont run the vehicle too long with out the cluster installed as the alternator will not charge without cluster installed and working bulb installed into batt idiot light spot.
    ~David~

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    But, that's just coming from me, this site's biggest pessimist. Best of luck

  6. #6

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    Quote Originally Posted by sly View Post
    As for voltage on the plug, With the sender disconnected, one wire should show voltage. I don't remember how much though. The other wire should reference ground when disconnected or look like a resistor to ground. Been a while since I've seen that schematic.
    It had no voltage at plug with key on. Is it fused anywhere I could check for a blown fuse?
    Last edited by mcb82gt; 01-11-2021 at 02:21 PM.

  7. #7
    Beater gonna beat sly's Avatar
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    Should be fused in the fuse box under the dash. "Instrument cluster and gauges" is usually the line item in the fuse listing in the manual. No clue which fuse though. Need the car's manual for that.

    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)
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

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