twiget
1/2 ton status
I bought a '90 Suburban 2500 today. 


I was out on the interstate today, cruising around, enjoying the first sun in a week in my new ride, when I hit a small bump in the road, and my speedometer dropped to 0 and cruise turned off. All my other gauges were fine, and the truck ran fine. I took the next exit anyway, and did as much of an inspection as one can do of the engine and rear-end in a parking lot. I didnt see anything obvious, and since home was only a couple more miles down the road, I decided to head home. A couple of minutes later I hit another small bump and my speedo started working again.
I'm 99% sure that there is an intermittent electrical connection between the tranny and the speedo. Unfortunately I just purchased my FSM on Ebay today, so it's a week or so away. Anyone have suggestions on where to start to look for a loose connection?



I was out on the interstate today, cruising around, enjoying the first sun in a week in my new ride, when I hit a small bump in the road, and my speedometer dropped to 0 and cruise turned off. All my other gauges were fine, and the truck ran fine. I took the next exit anyway, and did as much of an inspection as one can do of the engine and rear-end in a parking lot. I didnt see anything obvious, and since home was only a couple more miles down the road, I decided to head home. A couple of minutes later I hit another small bump and my speedo started working again.

I'm 99% sure that there is an intermittent electrical connection between the tranny and the speedo. Unfortunately I just purchased my FSM on Ebay today, so it's a week or so away. Anyone have suggestions on where to start to look for a loose connection?