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05-05-2008, 12:13 AM
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#1 |
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Registered User
Join Date: Mar 2006
Location: Kansas
Posts: 300
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Tach Wiring
I have bought a tach from Cheyenne Super Man and I have tach wiring question. On the stock wiring there is two wires that come off the positive side of the tach. I understand that on an HEI ignition there is a tach place and a 12v location for the ignition. But the ignition is already plugged into the distributor there. So where does the second wire go? The on the stock wiring there is a ground. It seems that this would go to the coil but in this case does it get grounded to anywhere or can I ground it to the fuse panel. A little advise would be great. Thanks
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1969 GMC 3/4 Ton 4x4 2" Lift, A/C, PS, PB 383 Stroker, 700R4, 205, 4.10 GM Medium Bronze (Copper Poly) no new nick name yet. She is to pretty to be the Beater. http://67-72chevytrucks.com/vboard/s...d.php?t=241855 |
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05-05-2008, 12:50 AM
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#2 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Tach Wiring
One to the tach terminal on the dist, the other to a switched ignition source (IGN UNFUSED on the fuse box)
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05-05-2008, 01:38 AM
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#3 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Tach Wiring
The tach gets its ground through the metal instrument housing so a separate ground wire is not needed.
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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05-05-2008, 03:05 AM
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#4 | |
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Registered User
Join Date: Oct 2006
Location: Cheney, KS
Posts: 669
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Re: Tach Wiring
Green wire is the signal from the dizzy.
Black wire is ground. White wire is for the light(splice into cluster) Red wire is for a key-on 12v source.
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05-05-2008, 03:18 AM
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#5 |
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Registered User
Join Date: Mar 2006
Location: Kansas
Posts: 300
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Re: Tach Wiring
Okay. I have one brown wire. Ground... I have one red wire with two ends on it. That is what is confusing. Why would the red wire have two ends on it.
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1969 GMC 3/4 Ton 4x4 2" Lift, A/C, PS, PB 383 Stroker, 700R4, 205, 4.10 GM Medium Bronze (Copper Poly) no new nick name yet. She is to pretty to be the Beater. http://67-72chevytrucks.com/vboard/s...d.php?t=241855 |
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05-05-2008, 03:20 AM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Tach Wiring
I was thinking a factory tach.
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05-05-2008, 04:55 AM
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#7 |
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Registered User
Join Date: Mar 2006
Location: Kansas
Posts: 300
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Re: Tach Wiring
Lets try this one more time. I apologize for the cofusion apparently I don't know what I am talking about. This is a 700 rpm tach that CS-M sells. So there is a red wire off of the back of the tach which is marked "+". This wire has two ends on it within an inch of each other. I assume one goes to the dist which is an HEI. The other one must go to a 12V source. But the 12V source on my dist is taken by the ignition wire. i also assume the tach location just interupts or grounds the 12V everytime it spins around therefore getting RPM. Should I splice the 12V ignition wire with the wire from the tach?
Next thing. the ground wire is very long and it has a clip end on it like one of the red wires. I was wondring if this goes to a stock fuse panel to ground it?If so I can ground it to the fuse box I have at the grounding terminal. Please enlighten me.
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1969 GMC 3/4 Ton 4x4 2" Lift, A/C, PS, PB 383 Stroker, 700R4, 205, 4.10 GM Medium Bronze (Copper Poly) no new nick name yet. She is to pretty to be the Beater. http://67-72chevytrucks.com/vboard/s...d.php?t=241855 |
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05-05-2008, 05:01 AM
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#8 |
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Registered User
Join Date: Jan 2007
Location: Charles City IA
Posts: 1,626
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Re: Tach Wiring
Ask CS-M, he should know what is what
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'67 C20, Under the Knife!, LWB, Eaton HO-52, Rear Coil Springs 72' GMC C2500, 350, TH400(?), Dana 60 '67 K10 4-spd., 305, SM465, Dana 44, 12 Bolt, RUST! '65 C60 292, 4 spd, 2 spd Rearend, 15' Grain Box, MINT! 09 Yukon Denali 82k Miles 6.2L/6A |
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05-05-2008, 05:02 AM
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#9 |
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Registered User
Join Date: Mar 2006
Location: Kansas
Posts: 300
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Re: Tach Wiring
That's great advice. But I didn't think he would answer his phone tonight.
__________________
1969 GMC 3/4 Ton 4x4 2" Lift, A/C, PS, PB 383 Stroker, 700R4, 205, 4.10 GM Medium Bronze (Copper Poly) no new nick name yet. She is to pretty to be the Beater. http://67-72chevytrucks.com/vboard/s...d.php?t=241855 |
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05-05-2008, 05:41 AM
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#10 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Tach Wiring
the red one has 2 ends on it, so you can hook it up and not lose a space to hook something else up.
Example, look at your fuse box, there's probably already something on the ignition ufused terminal. You unplug what ever that is, plug the tach in there, then what ever was there already, you just plug into the extra plug hanging off the red wire. |
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05-05-2008, 06:01 AM
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#11 | |
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someday it will be done!
Join Date: Sep 2004
Location: Lloydminster,AB. Canada
Posts: 1,620
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Re: Tach Wiring
Quote:
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'72 C-10 Proud owner of a million new and used pieces that used to be and will once again be(god willing) a testament to the term "they don't build em like that anymore.    '80 LWB 2wd beater '67 GMC long fleet (cab donor) '66 long step (parked till it's turn comes around) '65 short step (parts truck that will donate it's bed and possibly frame to the '66) '06 Grand Prix wife's car (she hardly lets me touch it) my pics |
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05-06-2008, 04:32 AM
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#12 |
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Registered User
Join Date: Mar 2006
Location: Kansas
Posts: 300
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Re: Tach Wiring
I want to thank the guys that put up with my ignorance. So after re-reading the posts I figured out what you were talking about. So here is what I ended up doing... I plugged the red wire into the power on the fuse box. Duh not the coil. I put the brown wire on the negative of the coil. That is where I was confused. The I ran a ground from the back of the tach to the fuse panel ground block.
So once again thanks for the patience for a brain dead confused person. The thing that confused me the most was I convinced myself the red wire had to go to the dist. Thanks Rollie and longhornman I am sure you were saying this guy just doesn't get it and I didn't
__________________
1969 GMC 3/4 Ton 4x4 2" Lift, A/C, PS, PB 383 Stroker, 700R4, 205, 4.10 GM Medium Bronze (Copper Poly) no new nick name yet. She is to pretty to be the Beater. http://67-72chevytrucks.com/vboard/s...d.php?t=241855 |
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05-06-2008, 04:44 AM
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#13 |
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someday it will be done!
Join Date: Sep 2004
Location: Lloydminster,AB. Canada
Posts: 1,620
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Re: Tach Wiring
Not at all.Sometimes a fresh perspective is all it takes.
__________________
'72 C-10 Proud owner of a million new and used pieces that used to be and will once again be(god willing) a testament to the term "they don't build em like that anymore. '80 LWB 2wd beater '67 GMC long fleet (cab donor) '66 long step (parked till it's turn comes around) '65 short step (parts truck that will donate it's bed and possibly frame to the '66) '06 Grand Prix wife's car (she hardly lets me touch it) my pics |
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05-06-2008, 04:53 AM
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#14 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Tach Wiring
honestly, i wasn't thinking that... glad you got it working... now you have to post a photo!
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