tach not working

1REVVIN3 · Post by **1REVVIN3** » May 26th, 2006, 9:55 am

I finished the hei mod about a month ago, and I cant seen to get my tahc working, I tried the 1000 ohm fuse, and even directly hooking it up.

Post by **Custommx3** » May 26th, 2006, 10:35 am

You do have the resistor inline and attached the wire beside it correct?

1REVVIN3 · Post by **1REVVIN3** » May 26th, 2006, 10:38 am

Does the tahc get its signal form the distributor?, or frm the external coil.

Grants · Post by **Grants** » May 26th, 2006, 12:06 pm

There is no such thing as a 1000 ohm fuse. Fuses restrict current (amps) and should have no resistance, unless blown when they should indicate infinity.

The tach signal is from the YELLOW / BLUE wire from the dizzy.

ariesdude · Post by **ariesdude** » May 26th, 2006, 12:29 pm

If you have an external coil -
The 1000 ohm resistor goes between the negative terminal of the external coil to the yellow/blue wire on the 3-wire connector(disty) and the 3 wire connector should not be plugged into the disty.
Also if you havent gutted the disty - it is recommended to cut the orange wire and the wire next to it in the 5-wire connector.

1REVVIN3 · Post by **1REVVIN3** » May 26th, 2006, 12:44 pm

Ok, thanks guys , resistor is what I meant to say, and I had it on the positve of the coil.

mx3autozam · Post by **mx3autozam** » May 26th, 2006, 1:11 pm

ariesdude wrote:If you have an external coil -
The 1000 ohm resistor goes between the negative terminal of the external coil to the yellow/blue wire on the 3-wire connector(disty) and the 3 wire connector should not be plugged into the disty.
Also if you havent gutted the disty - it is recommended to cut the orange wire and the wire next to it in the 5-wire connector.

or use a ze disty. Its all external pretty much all wahts in it aside from the Rotor Is the camshaft sesnor. I am running the HEI with external coil and my tach stopped working recently. I'm pretty sure the resistor has blown or lose connection. Its all fine. I can still drive the car hard I knopw which speed each gear ends at pretty much. I might look at it later on today and see what teh prob is

John

chertel · Post by **chertel** » July 5th, 2007, 5:05 pm

I used a 1/2 watt resistor, is that right or do I need a 1watt 1k resistor?

Tunes67 · Post by **Tunes67** » July 5th, 2007, 5:12 pm

Chertel... you do realize this thread is over a year old right?

Tunes67

chertel · Post by **chertel** » July 5th, 2007, 5:25 pm

I know I was just doing a search and thoutht Id ask on this thread rather than starting a new one.

Tunes67 · Post by **Tunes67** » July 5th, 2007, 5:26 pm

No big deal.. just some folks dig up old threads not realizing it.

Tunes67

mx3autozam · Post by **mx3autozam** » July 5th, 2007, 7:13 pm

the correct resistor is a 1000ohm resistor avilable in a bulk pack from radoshack. or also know as a 1k ohm which 1k = 1000ohm