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BMW Forum Index » BMW 8 Series Forum (E31) » 91 850i Tach going crazy

The time now is Fri Mar 12, 2010 1:08 am
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91 850i Tach going crazy
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lislehites
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Post 91 850i Tach going crazy 

I have a 91 850i and my tach is going crazy, bouncing all over the place. Any thoughts?

Thanks
Sat May 05, 2007 12:17 pm View user's profile Send private message
keith
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Post GROUND GROUND GROUND GROUND 

YOU NEED TO CHECK YOUR GROUND
Sun Jun 29, 2008 9:16 am View user's profile Send private message
lislehites
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I don't doubt it is a ground, but where do I start? Do you know where the Tach grounds?

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Lisle
Sun Jun 29, 2008 6:47 pm View user's profile Send private message
keith
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Post groundis ground 

simply ground the assembly to any ground surface available. there are only two sides of power in any circuit ac or dc doesnt matter! With DC THE OPPOSITE SIDE OF POWER IS GROUND WHY BOTHER TO LOCATE THE GROUND USED WHEN SEASONED bmw TECHS HAVE TROUBLE WITH THE 850 tEST WITH JUMPER WIRE WITH ALLIGATOR CLIPS TO BE SAFEST INSTALL CIRCUIT BREAKER OR INLINE FUSE IN JUMPER WIRE!!
Sun Jun 29, 2008 6:54 pm View user's profile Send private message
lovely09
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The root cause of the tach problem is poor grounds which can also affect your charging system.


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BMW Forum Index » BMW 8 Series Forum (E31) » 91 850i Tach going crazy

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