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This MAY Be The Problem With YOUR 88-89 Speedometer Too!

 
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Old 09-29-2014, 12:09 PM
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This MAY Be The Problem With YOUR 88-89 Speedometer Too!

Synopsys:

The speedometer on my '89 Prelude Si worked intermittently from the day I got my car this past March. I could tap on the top of the instrument cluster and the needle would bounce up and work for a bit then go back to zero, so I knew I had some sort of loose connection. I checked the connectors on the back and they clicked in properly and the wires looked healthy so I figured it was in the Speedo itself. I removed instrument cluster from my car to disassemble and inspect it.

Keep in mind that the instrument cluster for a 90-91 is different, and so are the gauges.

Down & Dirty on How to Fix the problem:

I disassembled the cluster, removed and disassembled the Speedometer, and I saw that the pins of the Yellow Connector on back had fractured solder joints where they are soldered to the circuit board. Check out the dark line around the pins...



I popped the circuit card out of its plastic casing, reflowed the solder on ALL of the pins on that connector.

Notice how the solder joints are a nice and smooth flow...



I then popped the circuit card back into its casing and then reassembled and reinstalled the Speedometer into the cluster, and reassembled the cluster, and put it back in my car.

Don't forget to reattach your speedometer cable!
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1989 Honda Prelude Si - Daily Driver (So far, So Good)
1970 Buick GSX Clone - In progress
1988 Chevy Suburban TravelQuest - WorkHorse
1978 Buick Skylark - Sold

"Tackling Those Gremlins One By One"

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"Keep The Shiny Side Up & The Dirty Side Down"

Last edited by tonemeister69; 09-30-2014 at 03:42 PM.
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Old 09-29-2014, 12:45 PM
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Re: This MAY Be The Problem With YOUR 88-89 Speedometer Too!

Good job! People need to learn from this so they can apply it to fixing their Main Relays as well.
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Old 09-29-2014, 12:58 PM
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Re: This MAY Be The Problem With YOUR 88-89 Speedometer Too!

Thank you... I am SO happy that it was repairable and I didn't have to hunt down another Speedo. I already bought a 90 - 91 thinking I could use it as parts, but the whole thing is different. Nothing but the screws and lights are interchangeable.

And yeah, I fixed my main relay the same way... Just wish I could have gotten inside to the contacts and cleaned them up with some 400 grit sandpaper... I'm sure there's a bit of corbon on them.

I am also going to post the fix of my Tachometer and Cruise Control Button as well... The Cruise Control Button basically had the same issue, fractured solder joints, but the "fix" on the Tach was MUCH easier... It was just an alignment issue.
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1989 Honda Prelude Si - Daily Driver (So far, So Good)
1970 Buick GSX Clone - In progress
1988 Chevy Suburban TravelQuest - WorkHorse
1978 Buick Skylark - Sold

"Tackling Those Gremlins One By One"

"If you were as smart as you are dumb, you'd be Einstein!"

"Keep The Shiny Side Up & The Dirty Side Down"
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Old 09-29-2014, 01:04 PM
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Re: This MAY Be The Problem With YOUR 88-89 Speedometer Too!

Great write up. Should keep old cars going a little longer.

Like Les said, maybe this will inspire others to re-solder other stuff.
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Old 09-29-2014, 01:56 PM
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Re: This MAY Be The Problem With YOUR 88-89 Speedometer Too!

Quote:
Originally Posted by bykfixer View Post
Great write up. Should keep old cars going a little longer.

Like Les said, maybe this will inspire others to re-solder other stuff.
Thanks! And I totally agree. Soldering isn't that difficult as long as you know the basics of how to and what to look for...
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1989 Honda Prelude Si - Daily Driver (So far, So Good)
1970 Buick GSX Clone - In progress
1988 Chevy Suburban TravelQuest - WorkHorse
1978 Buick Skylark - Sold

"Tackling Those Gremlins One By One"

"If you were as smart as you are dumb, you'd be Einstein!"

"Keep The Shiny Side Up & The Dirty Side Down"
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