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  #1  
Old 10-15-2013, 02:10 PM
JayBrown JayBrown is offline
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tach wireing

So when I start my boat 76 s&s my tach goes to 6000 rpm at idel but sounds about 1000 rpm. It was like that all summer then when I started it would go from 1100 back to 6000 back and forth. Anyone ever had this problem as I don't like driving it with no tach
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Old 10-15-2013, 02:20 PM
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thatsmrmastercraft thatsmrmastercraft is online now
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Are you sure tach wire is connected to the negative side of the coil? Have you looked at the wiring behind the dash? I had plenty of bad connections on my '77.
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Old 10-15-2013, 03:07 PM
JayBrown JayBrown is offline
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I have looked everthing Looks ok but maybe a new wiring job is in need and which side is the negitive side?
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Old 10-15-2013, 03:27 PM
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Quote:
Originally Posted by JayBrown View Post
I have looked everthing Looks ok but maybe a new wiring job is in need and which side is the negitive side?
The side with the - . Not trying to be a smarta$$......they are marked + and -. Crazy electronic reactions are normally the result of a high resistance connection. My '77 was doing some strange stuff and I found some corrosion in the main harness connector and the ground buss bar was broken in two pieces and making intermittent for some of the dash functions.

When I got my boat there was a lot of light corrosion the caused a handful of problems.
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SINGLE AXLE 15" PACKAGE STARTING AT $439
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  #5  
Old 10-15-2013, 04:53 PM
JayBrown JayBrown is offline
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Ok I will have to take a look as the only thing that works on the dash is the fuel guage
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