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Old 03-12-2020, 02:53 AM   #1
Danacat12
 
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Default Speedometer permanently stuck at 25 mph

Hi, does anybody know why a 1989 Nissan Hardbody (5-speed) speedometer would get stuck at 25 mph,not move at all, but the odometer still works? It stays at 25 whether it's parked or driving down the road. The speedometer cluster was replaced years ago because of the bent/broke speedometer needle. So this would be the truck's second speedo cluster.
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Old 03-12-2020, 09:54 AM   #2
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If the needle isn't bent and touching the back card and rubbing.. then something inside might be broken...
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Old 03-13-2020, 02:00 AM   #3
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Is there anything you are doing that would cause the speedometer gauge to go out repeatedly?
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Old 03-13-2020, 09:08 AM   #4
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Is there anything you are doing that would cause the speedometer gauge to go out repeatedly?
Like Texas heat?
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Old 03-13-2020, 02:24 PM   #5
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Gear inside may be stuck, try pressing the trip reset a few times, I think I have pics of the rear of a speedometer from when I swapped the cluster in my former Sentra
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Old 03-14-2020, 03:01 AM   #6
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Does it move any if you move in reverse?
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Old 04-04-2020, 01:17 PM   #7
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I would second the bent needle, seen about 3 of them like that and if you mess with it too much it breaks off. Had to glue another needle from a clock on the stub and it worked
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Old 04-04-2020, 09:14 PM   #8
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I would second the bent needle, seen about 3 of them like that and if you mess with it too much it breaks off. Had to glue another needle from a clock on the stub and it worked
If you use a real bright flashlight sometimes you can tell if the needle is bent and sticking by looking at it real close.

*I THINK* this is the way it works on 89's: The speedo needle is electrically-driven, but the odometer is driven by these tiny gears in the box. *I THINK* when the odometer still works, but the speedo needle does NOT move...there is still a circuit getting to the speedometer...

So...could mean the needle itself is stuck and dragging. The ODOMETER usually will not work if there is no electricity going to the SPEEDOMETER, since I'm *pretty* sure it won't move if there is no juice going to it. Runs off tiny gears, but without a signal going to the speedo, it won't work either. If the SPEEDO works...but the ODOMETER is stuck...this usually means the little white gears in the odometer/speedo box on the back of the panel are stuck.

IF this is the case...that you have juice to the speedo/odometer, but no speedo working, could be stuck needle. You can remove the clear plastic cover and fix this. I had to do this on my 89, the one I had prior to the 97 I had now. I trimmed off the end of the needle and super-glued a replacement. It has to be very light in weight, or the needle won't show the right speed.

That clear plastic cover has tabs on it. You can crack the cover REAL easy. After 30 years, they are VERY brittle and tabs will snap off or you can crack the cover just breathing on the damn thing. Be careful.

I checked the Factory Service Manual for you. Did not see a cable going to the speedo unit from the tranny. Figured as much, but checked anyway.

I always tell people one other thing. If you switch from the stock 14" tires to 15"...from then on your speedo will read 2 MPH FASTER than you are actually going. Handy to know. One thing about these trucks is that if it gets too hot inside the cab on a really hot summer day, those damn needles will partly melt and bend over every time. I got to the point where I kept a window cracked sometimes...after I fixed it the first time.
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Old 04-04-2020, 09:52 PM   #9
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Mine is an 89 and it has power to it...
I bound out by touching the leads on the back with power... It takes a sec, but itll move.. That is if it is working correctly and the needle isnt dragging(youll be able to tell when it is out or maybe with a bright flash light in the gauge position of the dash).......
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Old 04-05-2020, 11:22 AM   #10
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Mine is an 89 and it has power to it...
I bound out by touching the leads on the back with power... It takes a sec, but itll move.. That is if it is working correctly and the needle isnt dragging(youll be able to tell when it is out or maybe with a bright flash light in the gauge position of the dash).......
If the needle moved at all when it got juice, but didn't work when driving...I would consider cleaning the contacts on both sides. Sounds like the circuit is intermittent, maybe needs to be shined up.

You should also determine if the needle is bent/dragging or both. After so many years, sometimes electricity actually causes some corrosion on the contacts. Time for some high grit sandpaper work maybe.
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