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Old 01-28-2010, 03:50 PM
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Please help with tach (light)

Ok so I put a 5 inch tach in my car&I hooked the yello wire for the light up to the wire from my headlight switch&it lights up but it stays on with or with out the key in the ignition or the assecories on.With the head lights off it still stays on.What do I do so that It only comes on when the headlights do? Or atleast so that it will cut off without the key in.thanx

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Old 01-28-2010, 04:48 PM
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it appears that you have the tach light wire hooked to the main incoming hot feed wire from the battery to the headlight switch, when you need to be hooked to the outgoing hot wire from the switch to the headlights.

There is battery power to the headlight switch at all times, which is why leaving the lights on with the engine off(i.e. when the alternator is not charging) you will drain the battery. You are hooked to the wrong wire.
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Old 01-28-2010, 06:28 PM
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Thanx eric I'm gonna go take it back apart tomorrow to get in there&fix it.
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Old 01-28-2010, 07:34 PM
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tach

Your Light wire is your White Wire.
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Old 01-28-2010, 09:45 PM
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Do you mean the wire from the headlight switch is white?
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Old 01-28-2010, 09:57 PM
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no,he means the white wire from tach is the light wire.
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Old 01-29-2010, 12:36 AM
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Do you mean the wire from the headlight switch is white?
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Old 01-29-2010, 12:42 AM
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Nope there is no white wire coming from my tach.its a yello for the light red for ignition green to dist&black for ground
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Old 01-29-2010, 01:03 AM
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ok,then hook the yellow wire to another wire to headlight switch different than the 1st time.
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Old 01-29-2010, 11:26 AM
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You need a test light or volt meter to find the wire you need to splice into, don't just be guessing. The better way is to tap into the fuse block. Look at the fuse diagram for the marker lights and tap into that one. I don't like tapping into wires with a splice unless you are doing it correctly. That means soldering and heat shrinking the connection.
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Old 01-29-2010, 12:39 PM
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Tach Light

I tend to agree with S10. Go with the fuse box. Lots easier than splicing. Good luck. Hope it's History by the time you read this.
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Old 01-29-2010, 03:28 PM
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I always ran the light wire to the fuse panel. Take a test light and find the fuse that works when you turn the lights on and will go off when you shut them off, even better Find the dash light fuse it will work. What brand tach are you installing?


Cole
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