last owner of my truck burnt up the 302 efi motor that was in there and swapped it out for a carb. 351w. left under the hood a complete mess. there is a rat's nest of wires all over the place im trying to clean up the mess and im gonna start with the ignition. the control box that i guess fires the coil is what i am focusing on.

i would like to know if anyone has the pin outs for the box. which wire is which so i can creat my own harness. i have messed with it today and it needs alot of work. there are wires spliced in areas that im suprised it hasnt caught fire yet. i have found the two wires that goto the distro. but there are thre wires coming out and two wires going to the box. what gives? (if you guys need pictures, let me know and i will provide) i cant figure out which is power, i know ground, and i have no idea what the rest of the wires do.

then there is the temp, oil, rpm that i have questions on. i located the wires to the senders and then they go back to a plug. now this plug has some other wires in them and i cant figure out what they do. they seem to go back into the main harness. what gives???

since it is a carb. motor i want the least amount of wires possible!! after i tackle the engine im gonna figure out the headlights/turnsignal harness then move to the back.

main thing is i need the pin outs for that box thing.

 

What year truck is it? I am going to assume someone put a duraspark II ignition system in. Here is the diagram for it.

 

that looks like it...

so here is what i got:
the red wire is spliced into a whole mess of ish.
the white wire is the same thing. it just kinda goes nowhere!

the black ground from the dist. is not there. it goes nowhere. not even on the other end of the plug. should i create a ground for this?

the starter relay only has one wire on it. and that wire is just to start it. should i wire the other end of it the way its supposed to be?


TIA

 

I don't know if I will be able to help you figure it out. But to get started, I and everybody else have to know what year truck it is so we can try to find a diagram for some of the wire colors.

 

well, its an 85 f150 that used to have an efi 302. ill take some pictures tomorrow.

 

Looking at the diagram in the back of the haynes manual, the red wire(hot wire for the module) would work if it was spliced into the 1985 white/lightblue hash wire. The white/lightblue was used to power the TFI ignition module.

It will work without the white wire hooked up. But it will start better, especially in hot weather, if you hook it up. Just find the red/lightblue wire in the harness, or go ahead and hook it up to the terminal on the starter relay where the red/lightblue is now. What the white wire does is trigger the module to retard the timing during starting. This makes the engine turn over much easier, saving the battery and the starter.

Try to hook the black wire up like the diagram. It should be bolted inside the distributor, and then run directly to the module.

When you get the engine running, measure the voltage on the coil +. If it's around 12 volts, then that is too high and you probably do not have the resistor that is shown in the diagram above. You need this resistance wire or resistor to keep the module and the coil running cool. Since you had TFI fuel injection, your harness may not have it. You can buy a resistor for a chrysler in the store, and hook it up like the diagram.

The extra terminal on the starter relay is to bypass this resistor for a hotter spark during starting. You can buy an older style relay that has the two terminals and hook it up, or you can try to find a brown/pink wire from the ignition switch, and hook it to the coil + to do the same thing.

 

i doubt i have the resistor. the way its wired now is scarey. does it tell you the value of the resistor? ill just goto radio shack and pick it up there.

i plan on making its own stand alone harness. im tired if dealing with whats there.

 

I doubt radio shack has the correct value. And it needs to be something bigger than I am guessing 20 watts. Ford says it should be 1.05 to 1.15 ohms.

 

heh, thats a might big resitor. i think i can get the same resistance thru a 1 ga. wire! 1.1 ohms! woa!

 

Put it somewhere where it can get some air. They do get warm.

 

very tru. thanks for all your help! gotta pick up a manual. first i gotta get some cash :-/ im looking for a job. high gas prices, 50 bucks left, and a carb'd 351 is a bad combo for a jobless 19yr old.