[DML] My Tach has a mind of its own!

["Nathan Sobieralski" <valleyrat12@xxxxxxxxx>]

Hello everyone,

I noticed this when I took the D for its weekly drive. After I started 
the car I turned the fans on to "3". The tach proceeded to jump up 
into the 3-4000 range and oscillate back and forth, like it was 
exaggerating my slightly hunting idle. What the heck? If I turned the 
vent fans off the tach would go back to normal or if I revved the 
engine it would go back to normal. After my drive it would not repeat 
the same behavior even with the AC and headlights on! Obviously this 
is an electrical issue but the batt reads 13 volts  at idle. I have 
cleaned millions of grounds. Any ideas?

Nathan
2277









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