Dan.Thanks for the reply.I'm looking for the point at which the various 
consumers of tach. info diverge.Trying to cut the problem into smaller 
parts.Fred

Fred Moir.Lynn MA.Diesel preferred.

> Date: Sat, 11 Jul 2015 19:26:27 -0400
> To: mercedes@okiebenz.com
> Subject: Re: [MBZ] '87 30TD rev counter.
> From: mercedes@okiebenz.com
> CC: d...@penoff.com
> 
> Don’t know about 87s, but earlier models had issues with electrolytic caps in 
> the tach that dried out.
> 
> Have you popped the cluster and taken a look around?
> 
> Dan
> 
> 
> > On Jul 11, 2015, at 7:17 PM, Fred Moir via Mercedes <mercedes@okiebenz.com> 
> > wrote:
> > 
> > Calling all genii.My 1987 300TD had an intermittent rev counter(Tachometer) 
> > that has since died.The signal would cut in and out making the car lurch at 
> > idle, ~500 rpm to 650 rpm.The signal pickup has 4.5 ac volts at idle and 
> > climbs when the throttle is increased.The OVP relay has been substituted 
> > with a known good and a new one, no change.Swapped the KLIMA for a known 
> > good one, no change. The ECU computer was also tried with a replacement, 
> > again, no change, still dead.As the intermittent signal supplies both the 
> > instrument and the Idle speed control, I can only assume that the signal is 
> > going missing before the common point.Any one have any ideas as to where to 
> > look for bad connection/broken wire/gremlins/vegas (?) ?Fred.
> > 
> > Fred Moir.Lynn MA.Diesel preferred.                                         
> >   
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