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Speedometer stuck pegged over 200 MPH

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Old Nov 10, 2016 | 10:54 AM
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Default Speedometer stuck pegged over 200 MPH

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Old Nov 10, 2016 | 11:07 AM
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I think the needles are plastic ? the stepper motor could be bad.
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Old Nov 10, 2016 | 11:28 AM
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Old Nov 10, 2016 | 12:13 PM
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From what I remember the gage needle is ALUMINUM and painted with a DAYGLO paint so the UV Florescent lights make it light up.

I have a spare cluster at home and I will see if I can trip the needle over to that side (by hand) and then I will see if a magnet placed anywhere near the Speedo will move the needle.

I will have to remember to bring my rare earth magnets to home from work!!!

Bill
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Old Nov 10, 2016 | 01:43 PM
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Old Nov 10, 2016 | 03:10 PM
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Aluminum or plastic, magnet won't work, it might however make the stepper motor move ? did you try just tapping on the shield ? (glass)

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Old Nov 10, 2016 | 03:23 PM
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Old Nov 10, 2016 | 03:46 PM
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Not sure if this will work on the Vette, but it worked on my Truck. I suspect they are similar.

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Old Nov 10, 2016 | 06:27 PM
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YES, YES, YES!!! I just used a magnet and the needle moved. A little magnet manipulation and I was able to move it to 7o MPH and then back to zero.

Now mind you, I have some fricken super high power neodymium magnets See link:

http://www.kjmagnetics.com/proddetail.asp?prod=BX8C8

Ok, OK,,,, So you don't have a super duper neodymium magnet. I tried it with a microwave magnetron magnet,,, HHMMMMM,,, Guess what?????? NO LUCK... The glass limits how close you can get to the stepper motor with the magnetron magnet! Without the glass, you can get it to move the needle.

The supper magnet moves it with or with out the glass!

SO,,, order your self some super high power neodymium magnets and you can FLOP the needle over to the correct side.


Before you give up hope, give this a try:

Have someone sit in the drivers seat. You disconnect the battery NEG cable. Connect a piece of 14-16 gage stranded or solid copper wire to the battery Neg TERMINAL. Temporarily make solid contact to the NEG battery post and have your assistant turn the ignition switch to ON.

Make some sort of communications signal that they can give you to tell you when the gages make full sweep. When the gages are at FULL SWEEP, pull the temp connection off the neg battery terminal.

Have them turn the ignition switch off. Reconnect the battery and have them turn the ignition switch ON and see if it will resync.

My cluster without glass, I can move the speedo needle to the same position as yours and it does stay there. SO,,, it most likely went too far .....

Last edited by Bill Curlee; Nov 10, 2016 at 06:29 PM.
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Old Nov 10, 2016 | 06:33 PM
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LOL! When I ordered my super magnets, I went a little crazy. My total bill was a LOT! Those bastards come in very handy for a LOT of cool stuff. I ordered a bunch of cool magnets!!!

I amaze people with how powerful the two large magnets are.

They will flat out HURT you if you are not careful.

Anyway, the super magnets are a repair path that you can try.

Bill
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Old Nov 10, 2016 | 06:42 PM
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Originally Posted by Bill Curlee
LOL! When I ordered my super magnets, I went a little crazy. My total bill was a LOT! Those bastards come in very handy for a LOT of cool stuff. I ordered a bunch of cool magnets!!!

I amaze people with how powerful the two large magnets are.

They will flat out HURT you if you are not careful.

Anyway, the super magnets are a repair path that you can try.

Bill
Come On Bill, we all know that is what powers the subs and right now one of them won't move !!! We are glad you could move the needle anyway !!
:rof l:
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Old Nov 10, 2016 | 07:22 PM
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PSSST,,,,,, Its a SECRET WORM DRIVE but,,,,,,, you didn't hear that from me.

Ive been intrigued with magnets since I was 6. Use to get them out of old speakers and cheep o DC Motors. Thought they were something special way back then.

I saw a You Tube vid on Neodymium magnets and just had to have some. Let me tell you, WOW! I was really impressed and very surprised at how strong that they really are!!!

They have some bigger and stronger magnets than the ones that I ordered.

Check out this SOMBITCH: http://www.kjmagnetics.com/proddetai...prod=DZ0X8-N52


Maybe,, just maybe, one day, I will shell out the big bucks for the BIG BOY MAGNET! LOL!
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Old Nov 10, 2016 | 08:25 PM
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Old Nov 10, 2016 | 08:41 PM
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Originally Posted by Bill Curlee
PSSST,,,,,, Its a SECRET WORM DRIVE but,,,,,,, you didn't hear that from me.

Ive been intrigued with magnets since I was 6. Use to get them out of old speakers and cheep o DC Motors. Thought they were something special way back then.

I saw a You Tube vid on Neodymium magnets and just had to have some. Let me tell you, WOW! I was really impressed and very surprised at how strong that they really are!!!

They have some bigger and stronger magnets than the ones that I ordered.

Check out this SOMBITCH: http://www.kjmagnetics.com/proddetai...prod=DZ0X8-N52


Maybe,, just maybe, one day, I will shell out the big bucks for the BIG BOY MAGNET! LOL!
Really good deal if you buy ten or more like I did !!!! (not really)
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Old Nov 10, 2016 | 08:42 PM
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The things we learn at the C 5 Forum !!
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Old Nov 10, 2016 | 08:52 PM
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CRAP,, I had a good hard drive magnet on my file cabinet at work. I should have brought that one home too.. They are also Neodymium magnets.

Let me look on my fridge and see if there may be one on there.

OK,,, as I stated, Im a magnet collector. YES, I have hard drive magnets here at home.
One from a laptop hard drive (small) and two from a desk top hard drive. (nice size) NEITHER ONE was strong enough to move the needle. Even if I put it directly on the face of the speed o face. SORRY.

I again checked the super strong magnets and it will move the needle far away from the face of the IPC!

Bill
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Old Nov 10, 2016 | 09:06 PM
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SO,,,,,,,, If you are going to actually purchase a super magnet, this is the one that I actually have and tested on the clusters:

http://www.kjmagnetics.com/proddetai...rod=BY0X08-N52

Don't want you to purchase something that I have not actually tested.

Bill
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To Speedometer stuck pegged over 200 MPH

Old Nov 10, 2016 | 09:07 PM
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I knew hard drive magnets were really strong, but didn't know they were Neodymium magnets ? Have taken many hard drives apart still have not found a use for the real COOL disc's, very shiny !!!
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Old Nov 10, 2016 | 10:28 PM
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Old Nov 11, 2016 | 08:13 AM
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Yes the 2"x 1" x 1/2" magnets are powerful but they are NOT so powerful that sticking it on a cabinet in the garage is safe. Stored there it wont bother anything.. The effective magnet field around the magnet is about 5"-6"

If you take the IPC unit out yourself, it may make the repair (Stepper Motor Replacement) a lot more reasonable. Labor to do the complete job will be pretty high. Its really not that difficult. Removing the plastic face and the clear lens is just a few screws and some plastic tabs.

You have to figure out if spending $35 + shipping for a magnet to move the needle to the normal position is worth giving it a try. It will allow you to manually move the needle without any dash disassembly. That could be all it takes. I know PROOF POSITIVE that manually placing the needle to the position where it is on your cluster, it will NOT move back on its own. Moving it back past that magic tipping point allows it to work normal again.
Then again you still don't know if that will be a permanent fix or a fix at all.. Maybe the stepper motor is really bad. I enjoy having specialty magnets so, its a plus for me. I was happy that I was able to prove out the experiment and it my help others in the future.

Funny story. When I took my magnets to work, I stuck them in my pocket and when I climbed the stairs to get to my office, the magnets found the steel hand rail and it was like someone yanked the E brake.
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