Which wire is coil ground?

[00 Red SS]

Hooking up my tach and cant tell which wire is the ground on the stock coil.

 

[SlowGT]

Got a test light? I think you can hook it up to the negative on the battery and then check each side of the coil with the ignition switch on/engine off. I don't want to lead you wrong, but I believe it's the back terminal as you're looking from the front of the car.

 

[BlackFox5.0]

I don't think there is a ground. Anyways it goes on the green wire from the coil.

 

[00 Red SS]

Right now i have it off the wire if your looking at the back of the coil its the right side. I was wondering if it was wrong because the tach is kinda jumpy and wont go over 2500rpms, its a 5" phanton tach w/ shift light.

 

[Rick 91GT]

It should be hooked into the GREEN wire as BlackFox50 stated

 

[SlowGT]

Sorry, my wires are black & orange at the coil. I hooked mine into the factory harness behind the dash and it was the green one in there though.

 

[Rick 91GT]

The wires going into the stock plug for the coil was black and orange?

 

[SlowGT]

Been so long I don't remember what the stock colors are. I think the black & orange may have been from the MSD box. My engine compt has been empty for several months now. They could've even been from an extension harness I made. I really don't recall Using Accel 300+ on the new setup, so I may never see the orange & black wires again I'll have to dig out the MSD box and see what color those wires were

 

[jrichker]

See http://www.autozone.com/servlet/UiB..._us/0900823d/80/19/59/5a/0900823d8019595a.jsp for help

 

[00 Red SS]

Theres a brown/yellow and red/green wires into the coil. The green wire off the tach is into the red/green wire on the coil, my red power wire goes into the #11 fuse and my ground is under a nut for the pedal assembly. Why do you think it wont go over 2,500rpms and gets erratic kinda bouncing momentarily Should i get a stronger power source for it?

 

[00 Red SS]

Thanks for the link but i cant tell which wire i need to use, one comes from fuselink N the other from the pcm

 

[jrichker]

One coil wire (Red/Lt Green) is power from the ignition switch & provides power to the coil the other wire (Tan/Yellow) goes to the TFI module. The TFI module does the same basic thing as points do in non-computer cars.