Removed old stock ecm and installed holley efi. Can these harnesses be just left as is or can they be used for anything?

 

Some of the PINK/BLACK wires might still be "hot" when the key is turned, Any ORANGE wire might carry full time voltage, and any BLACK or BLACK/WHITE might be a usable ground.

You might be able to use any of the remaining wiring depending on what you plan to use it for. Those plugs are called C207 and C221; Here is a list I made showing what each circuit is for in your 86.



Hope that helps !

 

Awesome thanks for the info.

 

how did you make out with your wiring? did everythign work out?

I am a week away from installing a new engine with a holley sniper on it. I eliminated all oem ecm wires, and kept the c207 wires inside the cabin, but eliminated them going into the engine bay. from looking at this layout of the wires, I see that I might need to run a ground at the black/white wire on the c207 (pin M) and possibly possibly the purple (pin P) wire if I want to retain my on/off toggle switch for my current TCC lockup setup.. Looks like all other wires at the C207 wont be needed? am i overlookign anything?

i was talking to scooter, and he suggested using one of the injector wires (pin A or D) on the C221 connector to trigger the sniper unit since it is hot in crank and hot in run. I think that is what we discussed.

everythign else on the C207 and C221 can be left unconnected and unused? or did you find anything else that needed tobe wired ?

 

My car is all wired up. Had a buddy help me out with the wiring. Wiring is not really my thing. I didnt have to use any of the wires from the old ecm plug. I was looking to use some of the power wires to run some interior accessories .I also used a toggle switch to control tcc. I didnt end up using the holley input output harness to control tcc. Some of the guys were having a hard time setting that up to work properly on the 700r4.

 

WOAH, I didnt know the sniper could control TCC! yea, I didn't know that was an option, I will have to look into it, that might be a better way for me to control TCC instead of a trans kit, or reworking my current toggle switch for TCC control. cool

 

Not sure if the sniper has that option. I have the holley hp

 

Just looked it up, input/output harness is for hp and dominator only

 

Ah!, bummer. oh well, I know I can figure something out. I don't mind not having lockup for a little bit while I get all the other bugs sorted out with the new 406 engine install. I can always keep using my toggle switch setup, or go with one of the professional kits for TCC control. thanks for checking for me.