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Username Post: odometer and tripmeter is not working        (Topic#233428)
Silverado90 
Contributor
Posts: 101

Loc: Tarsus / Turkey
Reg: 10-22-04
01-13-10 08:50 AM - Post#1841522    

hello everyone,
as the title says my odometer and tripmeter on my 90 k1500 stopped working,i am guessing they are connected to each other ? but my speedometer works just fine..
anyway i can't seem to find odometer and tripmeter on any parts catalog? anyone?
thank you
1961 Chevrolet Apache 10 -all stock but needs rebuilding,
1990 Chevrolet K1500-305 V8,700R4,LT255/75R16 BFGs All Terrains


Edited by Silverado90 on 01-13-10 08:52 AM. Reason for edit: No reason given.

 
someotherguy 
Moderator
Posts: 25571
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
01-13-10 09:30 AM - Post#1841543    
    In response to Silverado90

Very common problem on the 88-91 clusters; not nearly as much in the 92-94.

Both the odometer and tripmeter are run by a single small electric motor inside the cluster, each assembly connected with a little driveshaft. Usually what happens is one of the gears in the drive breaks.

I once saw a link for a place online that sold the small gears used in these assemblies but it didn't appear they had them for our dash clusters, just other makes/models.

You could always boneyard another cluster; since the speed sensor buffer (and its configuration based on your tire size & axle ratio) is built into the cluster, I'd stick with the cluster you already have but swap in the pieces from the replacement one to get your odometer working.

The catch is, finding another one that's any good, and there's no way to tell unless you install it.

Richard
94 C2500LD / 94 C1500 / 06 300C SRT8
Check out my truck shop projects


 
Bill K.b 
Senior Member
Posts: 4223

Loc: upstate NY
Reg: 10-24-05
01-13-10 07:29 PM - Post#1841897    
    In response to someotherguy

In a similar vein -

If a guy needed to swap out a VSS buffer, can they be bought? May be easier than trying to find a clunker with the right gear and tire size.

Mine's shown in the manual as seperate from the cluster and easy to swap -
Those who can, do. Those who can't, criticize it on the internet.

1988 G20 van 5.7L - driver.
1993 3500 dually 5.7L NV4500 - tow truck
1991 G20 van - parts truck

Plus cars for swap and sale
&yes, I once tried a frame swap on a 51 Chevy.


 
someotherguy 
Moderator
Posts: 25571
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
01-13-10 07:39 PM - Post#1841906    
    In response to Bill K.b

Sure, you can pick up a VSS buffer (DRAC) at any boneyard; in the trucks they are a separate module from 92 through 95. There are two variations on the theme; 7 jumpers inside or 14 jumpers inside - some think the change came with the introduction of the 4L60E transmission in '93 but I have disproven that by finding 7 jumper units in several '93 model trucks. Regardless, I think it would be wise to stick with whichever style yours currently has, as the replacement. My '94 has the 14 jumper version.

Now the cool part is, you can make the DRAC configurable very easily. You just replace the jumpers with a DIP switch. This lets you configure it to accurize your speedometer regardless of your gear ratio changes or tire size changes.

Here's a 7 jumper DRAC once you open its plastic cover:


And here's one with a DIP switch replacing the jumpers:


The simple formulas to determine how to configure it, and the corresponding settings, can be found at: http://www.tbichips.com/drac

I like to take the closest 3 possible settings, write them down, set the 1st one, then run up and down the road comparing to GPS. If it's not spot-on, I'll try the other settings until I get the closest one.

I've also performed this modification on the 88-91 clusters (which have the VSS buffer built-in) but still, many months later, have not had a street legal truck of this vintage to test it in to be sure it works. Waiting on an understanding customer that is interested in trying it.

Richard
94 C2500LD / 94 C1500 / 06 300C SRT8
Check out my truck shop projects


 
heygibb 
Member
Posts: 126

Loc: New Bern, NC
Reg: 02-11-03
01-13-10 10:16 PM - Post#1842000    
    In response to Silverado90

This may have been covered before but there’s a possibility this may aid you in attempting to fix your odometer. When my odometer stopped on my Silverado a few years ago, I decided to have a look-see and determine if it could be fixed. It could. That particular fix didn’t last long because I used hot glue instead of crazy glue. So this past weekend, I decided to see if my Sierra had a similar problem. It did, so I repaired it w/ a similar fix, but used crazy glue. Here’s how I did it.

After removing the cluster from the dash, I took the cover and bezel away from the housing. I saw that the shaft of the odometer, on the geared left side, had popped out of the cradle (for lack of a better word) it was mounted in. The “ears” of the mount had lost their holding ability, and the inertia from the gear that turned the odometer had forced the shaft up and away from that gear. As a result, no engagement of the odometer was maintained, and no mileage recorded.

In trying to reset the shaft of the odometer into its cradle, I had to figure a way to keep it there once it was seated. I took a small piece of plastic and modified it to hold the shaft down, even when under stress from the “driving” gear. I had some leftover dividers from tackle/tool boxes that worked well for me. After sizing the plastic to fit the space it was going into, I drilled an appropriate sized hole in it that lined up w/ the shaft height (when measuring from the bottom of the mount upward). Before I realized I had a dremel cutting wheel that would do the job, I used the drill bit to elongate the hole downward on the locking plate. It’s not exactly straight, but it worked. The slot allowed me to slide it over the shaft after it was in place, and lock it down w/ some crazy glue.


Here is a link to some pics of the process. Hope this helps. It’s not very difficult really.
http://s9.photobucket.com/albums/a64/heygibb/od ome...
1989 GMC Sierra K1500 w/91 Chevy 5.7L, AT


 
Silverado90 
Contributor
Posts: 101

Loc: Tarsus / Turkey
Reg: 10-22-04
01-16-10 12:58 AM - Post#1843191    
    In response to heygibb

thank you everyone for ideas and pics.I removed the cluster and find out the electirc motor is not working.(I jacked the wheels up and put in Drive,motor was not working)
I cleaned the 20 years of dust and oil ,at least cluster looks like brand new
but i can't understand why there isn't replacement of this parts at the catalogs.
1961 Chevrolet Apache 10 -all stock but needs rebuilding,
1990 Chevrolet K1500-305 V8,700R4,LT255/75R16 BFGs All Terrains


Edited by Silverado90 on 01-16-10 12:59 AM. Reason for edit: No reason given.

 
someotherguy 
Moderator
Posts: 25571
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
01-16-10 09:12 AM - Post#1843318    
    In response to Silverado90

No replacement readily available on the motor because they service(d) the cluster as a complete assembly.

Are you 100% sure the workings of the odometer/tripmeter aren't locked up and keeping the motor from running? I haven't seen a bad motor yet, but have seen several bad odometer/tripmeters.

Richard
94 C2500LD / 94 C1500 / 06 300C SRT8
Check out my truck shop projects


 
heygibb 
Member
Posts: 126

Loc: New Bern, NC
Reg: 02-11-03
01-16-10 10:53 AM - Post#1843366    
    In response to Silverado90

You're welcome re the pics I posted. I'm sorry they didn't address your particular problem. If the driving gear doesn't turn, I guess keeping the odometer/trip meter in position won't amount to a hill of beans.
I know what you mean about cleaning up a 20 yr old dusty cluster though. Mine looks a lot better, too.
1989 GMC Sierra K1500 w/91 Chevy 5.7L, AT


 
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