OK here is the deal. I am building a pulling truck out of an old 79 F250. I am in need of a wiring diagram but nobody can seem to come up with one. Now I have someone that thinks that they can but they need a VIN number to do it. I looked on the truck (which is mixed and matched from different trucks) and all I find is a tag in the door jam. The number there is 11 characters but my friend claims it should be 17. Am I looking at the correct thing? Do any of you have a 460 engine and a 17 character VIN? I need to know if it is possible that the truck only had 11 and if anyone has a VIN that they would share with me so I could get this wiring diagram.

Thanks,

Chris

 

First off, pre 1981 vehicles had 11 digit vins.

It's on the door, the dashboard, and the passenger side frame rail.

I'd look on the frame rail and clean up grease, oil, etc. If the truck has been mixed and matched, it makes it very difficult to track down which parts you need.

 

Crap... Well then I do have the correct number. Anybody have ideas of where to get a wiring diagram?

 

Oh boy, you're gonna get me in trouble. Ummm. I heard somewhere that some auto parts store has repair info on their website. Maybe even copyrighted material on wiring diagrams and such. (That'd be Autozone...shhhhh)

 

Fordtruckpuller - what part of the wiring do you need the diagram for?? engine, interior, etc? I have a shop book on CD for 1978 that has diagrams which should be the same for 79. I'll look at it if you want me too.
Where you located in Iowa? Boone here.

Eric
johaner78

 

Thank you. I "looked" at that and will see if that will work.

johaner78... I am in SW IA. About 20 miles south of Omaha, NE. I may need you to look some stuff up for me if the other stuff that I "looked" at doesn't help.

 

fordtruckpuller - no problem - just email me if you need some info. I used to live in west central iowa before moving to boone.

 

The VIN # is NOT on the dashboard on 73-79's.


You said you truck is 79.

3 posts and no electrical related question

Instead of just asking for a wiring diagram.

Why not ask a question relating to your Need for a wiring diagram ?

Maybe keep tech info on the site rather than done personally ?

 

Sorry Mil1ion... The truck that I got had the wiring harness laid on the front seat. Would you like to enlighten me and the rest of the board of how to wire this back together. I need only minimal wiring as this is a pulling truck and I won't have any accessories or gauge cluster or lights.

I was asking for a diagram for a reason and that was to simplify my life and get this truck wired. Sorry that it wasn't made public for the world to see. I try to be a contributing member of this and several other sites but somethings are better dealt with off of the site. Thank you to tcbofade for pointing me in the appropriate direction. This will get me started and then I will ask answers as needed.

 

Basically you need the harness run to the ignition switch.

From there you remove the non-essential wiring.

Wire is colour coded for systems.

ie: Blue/red stripe is courtesy/cluster lighting.

From the ignition switch you need a power in source and an ingition out source.

The Pink resistor wire from the ignition switch heads towards the coil.

There is a red/black wire (I think) that runs to the S terminal of the starter relay.

Here is the pin out for the Ign switch




Here is the ignition wiring for Duraspark II.

If you aren't using the Duraspark system let me know






Glad I could help

 

For the time being we are trying to use the DuraSpark. We will be using a battery disconnect, an ignition switch, and then a push button starter. Do we truely need that harness or can we just wire the things that we need?

 

If you are using duraspark you need the igntion resistance wiring.

12v at start up and 8 v to run,
any higher voltage will burn up the coil with extended use.

So....You basically only need.

Push button start switch which could be done with a remote starter switch used for doing compression testing available for about $5.00

1) Battery
2) Ground cable from battery to frame
3) Cable from Battery to relay
4) Starter relay
5) Cable to Starter
6) Remote switch from battery to starter relay (see above)
7) Key (throw or toggle) switch to allow power to ignition system with built-in resistance wire for Duraspark or No resistance wire for aftermarket ignition like Pertronix.

 

Thank you. I will try to look further into this tonight and see where we end up.

 

OK we are not out of the woods yet but he have a start on our wiring and think we will be able to make it go. Ran into this sketch on a demo derby site. A guy that goes by VSneader2posted it. If you would like to look at the thread you can here. I will let you know how it turns out.

 

Exactly like I envisioned.

Have fun