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Old 01-25-2010, 01:24 AM
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tach light doesnt work

hey guys i have a 1981 scottsdale chevy half ton with a 400 sb in it i hooked up a tach in it about 3 weeks ago i wired evrything like it said to but when i wired it to my light switch the light wont come on with my head lights and i used a test light and turned on and off my head lights before i tapped into the head light switch but it still doesnt come on what could be the problem and the tach works perfect just not the light in it im wondering what i did wrong?

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Old 01-25-2010, 04:00 AM
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did you ground it? run a test wire from the battery to the tach light
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Old 01-25-2010, 07:41 AM
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green, distributor. black, ground. red, keyed power source. white or yellow goes to the lights. Perhaps the bulb in the tach is bad? I just made a loop
on the end of the wire and tightened it on the end of the fuse marked inst lgts. The tach even dims when I dim the inst. lights out on the hwy.
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Old 01-25-2010, 07:02 PM
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tach light

yes wayneooo it is grounded but idk if its a good ground and how would i know if the bulb is bad in it?
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Old 01-26-2010, 09:02 AM
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1. Connect your test light to a hot wire source and probe your black ground wire to see if you have a good ground.

2 If you do, take the same test light connected to the hot wire and probe the light wire (usually white or yellow).

If the tach light doesn't come on, it's bad or you need to recheck your wire connections.

Also, be sure your panel light dimmer is full on.

Last edited by sqzbox; 01-26-2010 at 09:07 AM.
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Old 01-26-2010, 04:21 PM
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tach

sqz box if i dont have a good ground would the tach even work at all cuz it reads properlly when im driving around its just the light itself doesnt come on?
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Old 01-26-2010, 08:01 PM
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OK, got ground. Put 12v to the light wire. If it doesn't come on, bulb is bad.
Hope you bought it new so you can return it for another one.
If it's used, might have to do all your racing in the daylight!
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Old 01-27-2010, 08:10 PM
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tach

well i did buy it brand new lol and do i connect the test light to the 12v source wire then test the connection where i spliced into my headlight switch? or do i just attach the test light to any power source and then test the connection that way?
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Old 01-27-2010, 09:26 PM
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just a wild idea have you replaced the .................. bulb

if you speak the truth and used that test light to check the connection, it sure is not the light bulb ferry blocking out the light . you are wasting a lot of time and not using your thick head .

Glad you do not work for me .

8 post about a burnt out light bulb.....

this like the old joke: how many union guys does it take to change a light bulb ? 5, one to hold the bulb and 4 to turn the ladder ..
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