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Old 05-02-2011, 01:15 PM
fixinoldfordtrucks fixinoldfordtrucks is offline
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Firewall wiring diagram

I've done plenty of searching on here and can't come up with exactly what I need.
Can anyone give me a definitive diagram for the wiring coming out of the upper passenger side portion of the firewall?
The motor I'm working on caught fire so everything up to that point was toast. I'd like to rewire the whole thing including replacing the fuse box, but I can't seem to find a real simple wiring diagram. I found one for the distributor/ignition coil and got that wired up, but I'm still not getting spark, and now I lost power completely...I think something in that bundle isn't hooked up quite right.
Please help! Thanks in advance
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Old 05-02-2011, 08:28 PM
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First, welcome to FTE. A lot of good people here.
If youve lost all power the first thing I would check would be the fusible link(s). On the starter solenoid battery terminal are also several smaller wires. These go down towards the alternator and v. regulator. At least one is a fusible link and has a tag identifying it as such. The tag says "fusible link 16 ga". A quick test is to grasp the wire and gently pull on it. If it feels firm and doesn't give, it's good. If it feels soft and stretches then it's bad and needs to be replaced.
You can get fusible links from the auto parts store. Cut out the bad section and splice in the new one.
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Old 05-03-2011, 12:08 PM
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First thing I did was scrap all the fusible links and direct connected all of them for the time being. They will all be replaced when everything is said and done.
I got power back, still not sure what happened. Went back out an hour later, reconnected the battery and everything was well.
Still no spark though.

Anyone with decent diagrams? Atleast better than chasing what's in the book?
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Old 05-03-2011, 01:00 PM
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painless wirig, as well as several other companies, make complete wiring harnesses. You could get one of those and have a completely new system when you are done.

Better than trying to patch a burnt system back together.

Yes, they cost money.
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Old 05-04-2011, 07:49 PM
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I don't have a specific diagram of the firewall, but I can send a general wiring diagram for your truck if you want it.
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Old 05-05-2011, 12:35 AM
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Originally Posted by bucks77ford View Post
I don't have a specific diagram of the firewall, but I can send a general wiring diagram for your truck if you want it.
That'd be awesome man, I'd really appreciate it. I know I'm close, but there are still like 5 or 6 wires disconnected. Anything helps...baby steps
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Old 05-05-2011, 01:57 PM
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shouldn't be too much to it - lights, power, starter, coil/dizzy if it's not EFI, alternator, a/c if it's there (I'm assuming it's LHD American model here and you guys have the body/engine bay loom on that side with the wheel...)

easier to get some wire and make your own looms up maybe, like I did when going from an EFI 6cyl back to a carby 351 Cleveland in one of my cars
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Old 05-05-2011, 04:03 PM
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Here the basic diagrams for the truck.
Attached Images
  
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Old 05-05-2011, 06:58 PM
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Thanks man. Gonna print those out and get trying to figure this out. If you have a dumbed down version, this wire from here to here, kinda thing. But I'm gonna get working...thanks again!
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Old 05-11-2011, 05:45 PM
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Eureka! Got it running! Thanks again everyone for your help!
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Old 05-11-2011, 05:45 PM
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