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78 concord tach wiring? |
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tomslik 
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Joined: Mar/07/2008 Location: Colorado Status: Offline Points: 680 |
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 Topic: 78 concord tach wiring?Posted: Mar/23/2018 at 6:49am |
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tach has a green wire and a yellow coming out of it....is the green the tach signal, yellow B+ (or switched), and grounded thru the metal plate on the back?
I don't have a TSM for it so..... |
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67 american 290/4speed |
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1982AMCConcord
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Joined: Jul/13/2012 Location: Kenosha, WI Status: Offline Points: 1287 |
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Posted: Mar/23/2018 at 8:00am |
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I am interested in knowing more as well because I want to wiring in a RPM gauge into my 1982 AMC Concord that didn't come with one...
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Lyle
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Joined: Jul/17/2014 Location: None Status: Offline Points: 772 |
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Posted: Mar/23/2018 at 10:39am |
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I've been looking but cannot find a 78 or later factory tachometer listed. Not saying they were not optioned, but I cannot find it. Autozone has wiring diagrams on-line and none have the factory tach.
So for aftermarket tach's, NORMALLY: Yellow is power, ignition switch side Green is signal from the coil or ignition module Black is negative ground White is dash light Some older tach's had Red as power and Yellow as signal - no Green Best of luck. If you buy an aftermarket tach it should have wiring instructions with it.
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tomslik
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Posted: Mar/23/2018 at 3:33pm |
 it's not aftermarket |
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67 american 290/4speed |
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tomslik
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Posted: Mar/23/2018 at 3:35pm |
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67 american 290/4speed |
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billd
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Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 30894 |
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Posted: Mar/23/2018 at 4:34pm |
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In a car with the Concord/Spirit/Eagle tach, yellow goes to brown, brown goes to fuse block to power all of the gauges at the console AND the tach.
The green goes to the black which heads out under the hood and goes to coil (-) Negative. So yellow is power, green is coil - signal.  |
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tomslik
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Joined: Mar/07/2008 Location: Colorado Status: Offline Points: 680 |
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Posted: Mar/24/2018 at 6:12am |
Thanks,that's kinda what I thought, just wanting to confirm. just wanting to make sure it works before I throw it on ebay;) |
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67 american 290/4speed |
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1982AMCConcord
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Joined: Jul/13/2012 Location: Kenosha, WI Status: Offline Points: 1287 |
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Posted: Mar/28/2018 at 10:25am |
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Thanks for the info.
If anyone can help me in my Cluster Swap thread.. I'd appreciate it a lot! http://theamcforum.com/forum/concord-to-spirit-gt-s-x4-dash-cluster-swap_topic92860.html John
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billd wrote: