h.e.i. tach problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

thisolechevy · 01-26-2005, 06:13 PM

I coverted from points to h.e.i. a couple of months and personally I beleive that it is the best thing since sliced bread...lol anyways my tachometer (which I know is good because it has a shift light and I can still set the shift rpm so I now its functioning correctly) the tach wont work, I know for a fact that all wires are good and ran correctly and all fuses are good and that sort of thing, is there any way some part of my dizzy is bad? I had tach w/points and no tach w/hei (the tach is hei compatable)is there some type of selinoid in the dizzy for this?

stllookn · 01-26-2005, 07:24 PM

I know this is a silly question but did you hook to the tach terminal in the HEI dizzy? Make sure your wire is good...could have messed a crimp.

oldschooloutlaw · 01-26-2005, 07:55 PM

if you are using a crimp connector at tach terminal sometimes it will go beside the terminal and not get connected but it will look like it is

Longhorn Man · 01-26-2005, 08:19 PM

If the shift light is working, then the tach is getting the signal from the HEI. Only one wire that runs this, the green one.
Sounds like yout tach just crapped out on you.

67chevemall · 01-26-2005, 08:24 PM

If the green wire is good then it is the tack needle as.

thisolechevy · 01-26-2005, 10:01 PM

the tach is brand new and I just tested it on my old merc. w/ points and it worked fine. So apparently there is some type of problem with my hei setup. I am going to go pull the cap and see if there is anything that looks missing or broken because I got the tach used from a junkyard. any other suggestions?

thisolechevy · 01-26-2005, 11:21 PM

o.k. just looked at all of the connections and heres how it is on the dizzy cap. my main power wire connects to a terminal that then connects to the cap, this terminal has a brown wire coming from it which I was told is the tach. wire. I got to thinking doesnt the tach run off of negative pulse from the coil? so how could the tach wire be connected to the positive main wire? should I splice into the (-)negative wire coming from the cap and going into the dizzy base?
Please if anyone has a digram for the hei dizzy with all of the correct connections please post it!!

Hooter · 01-26-2005, 11:31 PM

just connect it too the Tach terminal on the cap, not anywhere else or else you could fry your tach, check to see if one of those skinny skinny wires going from the coil and soldered to the metal tabs, broke off at the solder joint

Rod · 01-26-2005, 11:57 PM

Does the gauge metal housing have a ground to the truck body?

thisolechevy · 01-27-2005, 11:05 AM

the gauge is grounded good, I am at my wits end on this whole stupid tach.

jhow66 · 01-27-2005, 12:31 PM

Quote:

Originally Posted by thisolechevy

o.k. just looked at all of the connections and heres how it is on the dizzy cap. my main power wire connects to a terminal that then connects to the cap, this terminal has a brown wire coming from it which I was told is the tach. wire. I got to thinking doesnt the tach run off of negative pulse from the coil? so how could the tach wire be connected to the positive main wire? should I splice into the (-)negative wire coming from the cap and going into the dizzy base?
Please if anyone has a digram for the hei dizzy with all of the correct connections please post it!!

This might help:

thisolechevy · 01-27-2005, 06:46 PM

thats exactly how I have it wired, I am going to take my carb off and give it a good thurough cleaning tonight so I will take the cap off and check everything and maybe get a new one.

01-26-2005, 06:13 PM	#1
thisolechevy Registered User Join Date: Jun 2004 Location: Gainesville, Fl Posts: 382	h.e.i. tach problem I coverted from points to h.e.i. a couple of months and personally I beleive that it is the best thing since sliced bread...lol anyways my tachometer (which I know is good because it has a shift light and I can still set the shift rpm so I now its functioning correctly) the tach wont work, I know for a fact that all wires are good and ran correctly and all fuses are good and that sort of thing, is there any way some part of my dizzy is bad? I had tach w/points and no tach w/hei (the tach is hei compatable)is there some type of selinoid in the dizzy for this? __________________ Man I need another 67-72!!!

01-26-2005, 07:24 PM	#2
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	I know this is a silly question but did you hook to the tach terminal in the HEI dizzy? Make sure your wire is good...could have messed a crimp. __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

01-26-2005, 07:55 PM	#3
oldschooloutlaw Registered User Join Date: Nov 2004 Location: Last big town in KY before the VA Line Posts: 66	if you are using a crimp connector at tach terminal sometimes it will go beside the terminal and not get connected but it will look like it is __________________ Drive fast and Take Chances - In memory of Todd Rowe #725 Fire Chief 96 Chevy K1500 67 Chevelle 70 Chevy C10 - Old Red

01-26-2005, 10:01 PM	#6
thisolechevy Registered User Join Date: Jun 2004 Location: Gainesville, Fl Posts: 382	the tach is brand new and I just tested it on my old merc. w/ points and it worked fine. So apparently there is some type of problem with my hei setup. I am going to go pull the cap and see if there is anything that looks missing or broken because I got the tach used from a junkyard. any other suggestions? __________________ Man I need another 67-72!!!

01-26-2005, 11:21 PM	#7
thisolechevy Registered User Join Date: Jun 2004 Location: Gainesville, Fl Posts: 382	o.k. just looked at all of the connections and heres how it is on the dizzy cap. my main power wire connects to a terminal that then connects to the cap, this terminal has a brown wire coming from it which I was told is the tach. wire. I got to thinking doesnt the tach run off of negative pulse from the coil? so how could the tach wire be connected to the positive main wire? should I splice into the (-)negative wire coming from the cap and going into the dizzy base? Please if anyone has a digram for the hei dizzy with all of the correct connections please post it!! __________________ Man I need another 67-72!!!

01-26-2005, 08:19 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	If the shift light is working, then the tach is getting the signal from the HEI. Only one wire that runs this, the green one. Sounds like yout tach just crapped out on you.

01-26-2005, 08:24 PM	#5
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	If the green wire is good then it is the tack needle as.

01-26-2005, 11:31 PM	#8
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	just connect it too the Tach terminal on the cap, not anywhere else or else you could fry your tach, check to see if one of those skinny skinny wires going from the coil and soldered to the metal tabs, broke off at the solder joint __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

01-26-2005, 11:57 PM	#9
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Does the gauge metal housing have a ground to the truck body? __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

01-27-2005, 11:05 AM	#10
thisolechevy Registered User Join Date: Jun 2004 Location: Gainesville, Fl Posts: 382	the gauge is grounded good, I am at my wits end on this whole stupid tach. __________________ Man I need another 67-72!!!

01-27-2005, 06:46 PM	#12
thisolechevy Registered User Join Date: Jun 2004 Location: Gainesville, Fl Posts: 382	thats exactly how I have it wired, I am going to take my carb off and give it a good thurough cleaning tonight so I will take the cap off and check everything and maybe get a new one. __________________ Man I need another 67-72!!!



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