tach wire missing

[cutt]

for some reason this car does not have the tach feed wire behind the alt. is there anywhere else i can tap into under the hood for a tach feed?

 

[Boost231]

did you pull back the wire loom to see if someone just tucked it away. i would pull the wire loom way back and try to find that wire. if someone cut it back then its a easy fix.

 

[Tony Shoaff]

Tach Wire

What color is this wire? Thanks.

 

[hrhoward]

It's the green one.

 

[Evaddave 87gn]

Wire is white

The wire is white, not green. There is a green end connector on it though.

Evaddave

 

[87GNSteve]

This is a GN right? Not a TTA because the TTA doesnt have the FP test and tach connector.

 

[cutt]

tach wire

found it guys thanks!

 

[hrhoward]

The wire is white, not green. There is a green end connector on it though.

Evaddave

oops, you are right. I knew something was green.:biggrin:

 

[Tony Shoaff]

Tach WIRE

i NEED TO KNOW IF YOU CAN PROBE THIS WIRE TO SEE IF IT IS HOT? IS THAT POSSIBLE? tHANKS.

 

[Boost231]

what do you mean if its hot?

 

[Tony Shoaff]

I would like to know if the wire works.

I had a shift solenoid hooked up to this wire and it would not shift. I wonder if the wire had a pulse?

 

[Tony Shoaff]

Nobody answered

The reasom I ask is the wires on my car had been cut. There are 3 white or tan wires around the alt missing ends.. My other 86 has a green connector with two wires going to it and a single wire with a brown connector. Is the dual wire the tach lead? Everyone mentioned a single white wire. What is it?
Thanks.

 

[TurboDave]

the tach lead is a dual wire (white, probably not white after 20+ years) with a green connector.

 

[hrhoward]

Yes, the two white are the tach.

 

[Tony Shoaff]

Thanks Guys.

 

[11secondgs]

installing a vdo tach on my GN.

It calls for 1 wire.....how do I wire this. I have no tach wires in my engine compartment which I need to find somehow.


How do I get a tach signal from this vehicle. Connector A or B4 on the pcm does not do the trick for some reason.

How do I get an increase of voltage with rpm increase.

 

[TURBOPOWERED68]

look for this

 

[11secondgs]

Found the two wires......They were cut way off back near the firewall and replaced with a green and a blue, and they appear to run a relay which I am assuming is the fuel pump?????????

I tied into them and the tach works like a charm......If I do it this way, Will I hurt the fuel pump voltage????

Thanks to all who replied.