1993 Blazer. Speedo off, no odometer, no cruise...

[MrFleming007]

Hey everyone!

So, I'm trying to troubleshoot a couple issues with my 1993 K1500 Blazer. The speedometer reads a constant 4-5mph fast at all speeds and the trip odometer appears to be dead (actually, it may have registered about 1/10 mile over the last couple hundred miles). And finally, the cruise control is inop. I've done the standard diagnosis on the cruise and eveything gets voltage when it should now (after replacing both the multi switch and brake switch), so I'm left wondering if maybe the vss is bad? Transmission seems to be shifting fine, but I can't confirm at this point if it is going into overdrive or not. Thanks in advance for any suggestions!

 

[MrFleming007]

Ttt...

Ok, overdrive was dead, so I replaced the vss. Overdrive is back and the tranny seems to shift smoother. No change to the speedometer or trip odometer. Cruise is still dead too. We have a new multiswitch and brake switch that are confirmed to be working. Also took a multimeter to the cruise servo connection on the firewall and confirmed that each wire seems to be doing what it should .We also took a working servo off another truck and tried swapping that in- no go. What else could be causing these issues?

 

[MrFleming007]

Just to follow up on this, we picked up a used junkyard cluster for $10.00. Swapped the original odometer over and in the process discovered that the trip odometer in both the original and junkyard clusters had a broken plastic drive gear. I epoxied the gear back together, let it dry overnight and re-installed it. The trip odometer now works again!

And not sure what the problem was with the original speedometer, but it now reads within .5 mph of gps speed. Might have had a lazy servo in the old cluster.

So.... only issue left now is the cruise control.

 

[SunlitComet]

If fuse #6 CRUISE 10 Amp is good then most likely your stop light switch on brake pedal is broken.

 

[Gzes]

sounds like a big problem. i didnt know the 92-94 k5 could have cruise. mine doesnt have it. can u take a pic n show me?

 

[MrFleming007]

No #6 fuse in the 92-94 K1500 Blazers or 88-94 Trucks. From what I can find on LS1truck and fullsizechevy the cruise runs off the same fuse as the gauges in these years. Gauges run fine. Brake switch is working great and I've confirmed voltage off both connectors via multimeter. I'm starting to wonder if something in the DRAC module has gone out and may try this fix from LS1 truck...

http://www.ls1truck.com/forums/lsx-truck-conversions/25273-1993-obs-speedometer-cruise-control-wiring.html

I like a challenge, but this is getting ridiculous, lol!

 

[SunlitComet]

Here is what I got in diagrams:


Electrical Diagrams
Diagrams

Notes

Cruise Control Gasoline Engines (Part 1 Of 2)

Notes

Cruise Control Gasoline Engines (Part 2 Of 2)

 

[MrFleming007]

Here is what I got in diagrams:

Thanks, but its not showing up for me. I'm getting a Ford Door sticker diagram, and a exploded view of a rear end gear assembly, lol

 

[SunlitComet]

You took to long to look at your post. It has been refreshed above.

 

[MrFleming007]

Awesome, thanks! I'll take a look and get back to you!