 Tach wire kills engine |
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| surfdogskier |
 Oct 28 2019, 12:06 PM
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#1
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Member  Group: Members Posts: 164 Joined: 20-May 16 From: East TN Member No.: 20,019 Region Association: None  |
So when I go to start my car, my tach bottoms out max. None of my gauges work. When I hook my tach wire to my coil (black/purple wire), it kills my engine.
I am sure all of this is related to one thing. Suggestions? |
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| Retroracer |
Oct 28 2019, 12:35 PM
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#2
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Senior Member Group: Members Posts: 614 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest 
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Unplug the tach wire at the gauge end and check for shorts to chassis. The symptoms you describe would be similar to what you are seeing?
- Tony |
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| ClayPerrine |
Oct 28 2019, 12:50 PM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,490 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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That also makes a great anti-theft device. Just put a tap on the black/purple wire off the back of the tach, run it through a switch and ground the other side of the switch.
It won't start unless you know about the switch. |
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| surfdogskier |
Oct 28 2019, 02:03 PM
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#4
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Member Group: Members Posts: 164 Joined: 20-May 16 From: East TN Member No.: 20,019 Region Association: None |
QUOTE(ClayPerrine @ Oct 28 2019, 02:50 PM)  That also makes a great anti-theft device. Just put a tap on the black/purple wire off the back of the tach, run it through a switch and ground the other side of the switch. It won't start unless you know about the switch. That's a good point. There is something under my dash that is like dials switch that doesn't have a knob on it. It very well could be a kill switch someone put on. It is definitely not factory. I will post back once I am able to get under there. |
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| SirAndy |
Oct 28 2019, 02:24 PM
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#5
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Resident German Group: Admin Posts: 41,662 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(surfdogskier @ Oct 28 2019, 01:03 PM) There is something under my dash that is like dials switch that doesn't have a knob on it. It very well could be a kill switch someone put on. It is definitely not factory. I will post back once I am able to get under there. Sounds like the odometer reset, in which case it is factory ... (IMG:style_emoticons/default/smile.gif) |
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| dr914@autoatlanta.com |
Oct 28 2019, 02:36 PM
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#6
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914 Guru Group: Members Posts: 7,875 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
if connected properly bad tach
QUOTE(surfdogskier @ Oct 28 2019, 11:06 AM) So when I go to start my car, my tach bottoms out max. None of my gauges work. When I hook my tach wire to my coil (black/purple wire), it kills my engine. I am sure all of this is related to one thing. Suggestions? |
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| Beebo Kanelle |
Oct 28 2019, 09:31 PM
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#7
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Member Group: Members Posts: 248 Joined: 22-November 12 From: Houston, Texas Member No.: 15,177 Region Association: Southwest Region
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Check your wiring connections again - make sure the tach is not wired backwards
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| Spoke |
Oct 29 2019, 05:38 AM
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#8
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Jerry Group: Members Posts: 6,986 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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I had the same issue once. Turned out the wire from the ignition coil to the relay board was shorting to ground. Ran a new wire from the could to the relay board and all was fine.
Try disconnecting the wire at the tach and see if the engine runs. |
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