speedometer help

Discussion of STOCK TripMinder®, audio, video, LED, capacitors, instrument clusters and controls, integrated circuitry and boards, low voltage, message center, resistors, speedometers, tachometers, transistors and systems.

Re: speedometer help

Postby sonnyboy » Tue Nov 12, 2013 3:25 pm

I have a 1984 Lincoln continental with a digital cluster (speedometer,fuel gauge,odometer) that didn't light up at all. So I tested it like the post you showed and nothing lite up. So I decided to take it apart and check the circut boards. The one on the bottom had a bad capaciter, was blown. So I replaced it and my cluster lite up after I tested it . cap was a 220uf 25volts and I replaced it with one a little stronger 220uf 50 volts and its working fine
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Re: speedometer help

Postby nickyb262 » Sat Nov 23, 2013 1:11 pm

u got pics of the capacitor that was bad...i was looking at mine n i think i may have the same problem
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Re: speedometer help

Postby sonnyboy » Sat Nov 23, 2013 5:58 pm

nickyb262 wrote:u got pics of the capacitor that was bad...i was looking at mine n i think i may have the same problem

send me your email address and I will send you a pic
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Re: speedometer help

Postby nickyb262 » Mon Dec 16, 2013 8:05 pm

Pm sent but no reply
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Re: speedometer help

Postby White Lincoln » Tue Dec 17, 2013 2:39 pm

sonnyboy wrote: So I replaced it and my cluster lite up after I tested it . cap was a 220uf 25volts and I replaced it with one a little stronger 220uf 50 volts and its working fine

Nice diagnostics and repair!
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Re: speedometer help

Postby lpjbird » Wed Sep 21, 2016 2:35 pm

The orange wire, does that go to the fuel level sender? Well that's what it shows in the manual I have and I do see it's tied in with quite a few other wires that look like they may be grounds, I don't know not an elect engineer.
I've had this problem for years & gave up and yesterday out of the blue the speedo, odometer, fuel all lit up flickered then went back out. Really annoying trying to track this down. I'm going to give your suggestion a shot and see if it works or blows something else up. I'm desperate at this point and can't accept defeat.
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Re: speedometer help

Postby oldschool1 » Wed Sep 21, 2016 7:00 pm

LPJ,
Don't laugh but, in our 1984 Lincoln Mark VIIs, the fix for this is to reground the fuel tank.

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Re: speedometer help

Postby lpjbird » Mon Sep 26, 2016 1:37 pm

oldschool1 wrote:LPJ,
Don't laugh but, in our 1984 Lincoln Mark VIIs, the fix for this is to reground the fuel tank.

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There's gotta be a better way, my back hurts just looking at your pic. I tried the orange wire splice that was suggested and it did nothing in my case so maybe it can stay like it is for a while.
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If I knew I was gonna live this long I would've taken better care of myself. (Bobby Lane)
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Re: speedometer help

Postby oldschool1 » Mon Sep 26, 2016 3:09 pm

We discovered that the ORANGE WIRE GROUND FIX only pertains to 1990 and 1991s.

The fuel tank ground can be done WITHOUT dropping the tank.
These were the first pictures I came across.
These are of a fuel tank removal.
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Re: speedometer help

Postby Porterhouse » Fri Feb 10, 2017 3:09 am

oldschool1 wrote:We discovered that the ORANGE WIRE GROUND FIX only pertains to 1990 and 1991s.



If you're talking about the orange wire ground fix, as in the orange wire behind the driver's side kick panel, grounding it to make the tach and fuel gauge work properly when the headlights are on, I can confirm it works on my 1988.
1988 Mark VII LSC, "Old Faithful," 2nd Owner, Cobra R wheels, 1984 "Continental" style nose & badging, 183K, Owned since August 2001
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Re: speedometer help

Postby oldschool1 » Fri Feb 17, 2017 11:31 pm

I stand corrected.

Thank you for providing first hand experience.
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