[MBZ] e300 cruise control

[Kaleb C. Striplin via Mercedes]

On my 95 E300 early in the summer the cruise control quit working.  I 
swapped in a rebuilt Programa unit I had bought for another 95 that I 
pulled off the road due to rust.  This unit was probably a couple of 
years old, was not used more than a year.  So anyway, cruise worked fine 
then I started noticing while driving I could feel it dropping out then 
kick back in right away.  Just felt like a little surge.  Over the 
course of a few days it got worse.  It then got to the point where it 
would drop out completely and then sudden kick back in on its own a 
minute or 2 later.  This progressed to dropping out, then kicking back 
in 10 minutes later, then it just quick working all together.  I figured 
it amp was bad again so I rebuilt the original amp with new caps and 
resoldered it.  I installed it this past weekend and tested the car and 
it worked.  Previously with this original unit it would not kick in at 
all.  Today I drove the car and took it for a 2 hour drive and the 
cruise worked great.  On the way back I started feeling the same 
surging/dropping out it was doing before.  At one point it dropped out 
for about 5 minutes then kicked back in.  After that it worked fine 
again but sometimes could feel it dropping out for a split second then 
kick back in. Other times it would go a long time and never do it.  So 
basically its starting to do the same thing the rebuilt Programa unit 
was doing.  I am starting to wonder if there is another issue. Could it 
be something with the actuator or the speed sensor in the speedo?  Maybe 
its loosing power to the amp, maybe a flaky fuse. I need to check that.

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