Speedometer bouncing

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Author Message   Brian Leonard (Brian425) New Member Username: Brian425 Post Number: 23 Registered: 02-2003 Posted on Tuesday, May 27, 2003 - 10:28 pm:    I have a 99 D1 with about 52,000 miles. I noticed when driving from NYC to North Carolina that the speedometer bounced once (traveling a steady 75 and the speedo dropped down to about 40). Is the infamous Lucas electrics warning me of some impending doom? It only saw it one time. I watched it pretty closely for the next 700 miles and it has not happened again. Thanks, Brian   James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 74 Registered: 03-2003 Posted on Wednesday, May 28, 2003 - 05:29 pm:    Mine did that a few times over the past yr.... last week my speedo failed completly.... The dealer is putting in a new instrument package... might be connected but i really have no idea James   Robert Sublett (Rubisco98) Senior Member Username: Rubisco98 Post Number: 879 Registered: 04-2002 Posted on Wednesday, May 28, 2003 - 05:56 pm:    Bouncing tach and speedometer are tell tale signs of alternator failure, take it from someone who it has happened to twice within 6 months. Be wary!   Brian Leonard (Brian425) New Member Username: Brian425 Post Number: 24 Registered: 02-2003 Posted on Wednesday, May 28, 2003 - 09:25 pm:    Thanks guys. I'll check the altenator on Saturday. More quality time with the Rover.   Todd Juneau (Toddxd) Member Username: Toddxd Post Number: 96 Registered: 11-2002 Posted on Thursday, May 29, 2003 - 12:19 pm:    Hey Brian, My 97D1 did this and it was the VSS. You may want to consider replacing that first, it is much cheaper. There are many posts on DWEB that point to the VSS as the cause of the speedo jumping. If it is the Tach, that is more likely to be the Alternator.