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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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Not Ranked
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.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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09-16-2011, 10:32 PM
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CC Member
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Join Date: Aug 2000
Location: Chicago,
IL
Cobra Make, Engine: ERA 454 S.O.
Posts: 1,684
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Not Ranked
Rick:
Curious, what brand?
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Jeff
“If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower.”
Mark Donahue
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09-17-2011, 02:14 AM
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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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Not Ranked
It started life years ago as a Stewart Warner, then it originaly failed I sent it off to have the internals changed. It lasted 5+ years. I was told they installed a VDO circuit board and other part. It has worked very well. The car has the basics as far as electrical; fan, lights, horn, dash lights, MSD 6T ignition. The fan did NOT click on, as the key was turned in this sitation. It had been driven 100 miles and had sat for an hour, while we were in the restaurant.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Last edited by Rick Parker; 09-17-2011 at 10:30 AM..
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09-17-2011, 06:06 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,021
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Not Ranked
Quote:
Originally Posted by Rick Parker
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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I'm not saying he's right, but you can get a "voltage spike" of several thousand volts by just dragging your feet over the carpet.... |
09-17-2011, 10:40 AM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
ignition switch getting sloppy? any other weird electrical intermittent things going on?
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Fred B
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09-17-2011, 12:46 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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Not Ranked
No & No.........I just think it was time to go??
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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09-17-2011, 12:51 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,021
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Not Ranked
Quote:
Originally Posted by Rick Parker
I just think it was time to go??
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Yep, better the tach than you....  |
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