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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,189
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ack - tach signal noise? (no tachometer / no speedo)
I just don't get it. The tach moves up only when jumpered to a sqr wave signal generator. (and does so with less voltage than otherwise present - same for speedo)
The voltage of the car seems good (13.8 - 14.1 running). Swapped in a spare CD - nothing Getting 4.xx volts at the signal (black and purple) wire. ...jumpered directly to the CD signal plug just to test. - still nothing. Grounds jumpered... All I can figure, at this point, is that there is maybe some extraneous electrical noise pulsing thru the system. Any ideas out there? Do voltage reg's get noisy?
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong. Disclaimer: the above was 2¢ worth. More information is available as my professional opinion, which is provided for an exorbitant fee. 
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06-02-2014, 06:26 PM
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