Tach QuestIons - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pctahlequah · 05-02-2010, 02:17 PM

I have a small Suntach II. It has 4 wires on it: red, green, white, and black. The red goes to the distributer and the black is the ground. What are the other two wires?
Also, when I've hooked up the red and black the engine won't start until I disconnect the tach then it fires right up. i plug in the red again and the engine starts cutting out and stalls.
Can someone explain that one to me?
Thanks,

Bears63 · 05-02-2010, 02:51 PM

Black is ground, white is for the light (hook it in with dash lights), RED GOES TO A SWITCHED POWER SOURCE and GREEN GOES TO THE DISTRIBUTOR.

Sorry for the caps, I wasn't "yelling", just making sure to get your attention. Google "Sun Tach Wiring" and you will see the same thing as I just told you.

pctahlequah · 05-02-2010, 03:37 PM

Well, that is interesting. I haven't used this tach In years and would have sworn the red was the tach wire. The green wire looks like it has never been used.
Thanks for the heads up. I will rewire it today and see what I get.

pctahlequah · 05-03-2010, 08:58 AM

Tach works like a charm except the back light. But my panel lights aren't working either so I'll check that later.
Thanks for the help,

Bears63 · 05-03-2010, 10:45 AM

Good to hear. Glad I could point you in the right direction.

05-02-2010, 02:17 PM	#1
pctahlequah Registered User Join Date: Mar 2009 Location: Tahlequah, OK Posts: 31	Tach QuestIons I have a small Suntach II. It has 4 wires on it: red, green, white, and black. The red goes to the distributer and the black is the ground. What are the other two wires? Also, when I've hooked up the red and black the engine won't start until I disconnect the tach then it fires right up. i plug in the red again and the engine starts cutting out and stalls. Can someone explain that one to me? Thanks, __________________ '66 C20 converted to C10, 454/TH400 '66 C10 saved from crusher Last edited by pctahlequah; 05-02-2010 at 02:25 PM.

05-02-2010, 02:51 PM	#2
Bears63 ...just another truck junkie.. Join Date: May 2009 Location: Watertown, SD Posts: 698	Re: Tach QuestIons Black is ground, white is for the light (hook it in with dash lights), RED GOES TO A SWITCHED POWER SOURCE and GREEN GOES TO THE DISTRIBUTOR. Sorry for the caps, I wasn't "yelling", just making sure to get your attention. Google "Sun Tach Wiring" and you will see the same thing as I just told you. __________________ Mike "Bear" Shea

05-02-2010, 03:37 PM	#3
pctahlequah Registered User Join Date: Mar 2009 Location: Tahlequah, OK Posts: 31	Re: Tach QuestIons Well, that is interesting. I haven't used this tach In years and would have sworn the red was the tach wire. The green wire looks like it has never been used. Thanks for the heads up. I will rewire it today and see what I get. __________________ '66 C20 converted to C10, 454/TH400 '66 C10 saved from crusher

05-03-2010, 08:58 AM	#4
pctahlequah Registered User Join Date: Mar 2009 Location: Tahlequah, OK Posts: 31	Re: Tach QuestIons Tach works like a charm except the back light. But my panel lights aren't working either so I'll check that later. Thanks for the help, __________________ '66 C20 converted to C10, 454/TH400 '66 C10 saved from crusher

05-03-2010, 10:45 AM	#5
Bears63 ...just another truck junkie.. Join Date: May 2009 Location: Watertown, SD Posts: 698	Re: Tach QuestIons Good to hear. Glad I could point you in the right direction. __________________ Mike "Bear" Shea

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