09-16-2011, 09:49 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Failed Tach
Last week I turned the key on and the needle swung to 4000 Rpm and then dropped to 2000 Rpm. All this without the engine even being started. From that point it did not function properly. I sent it to be repaired and was told the circuit board had failed due to a voltage spike. I'm having difficulty with this as I have redundant grounds and it has worked flawlessly for 5+ years, as have all other electrics. Can someone elaborate as to how a voltage spike can occur without the alternator energized and functioning. It was suggested by the repair tech to put a 3 amp fast blow fuse.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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