wiring problems
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Freshman User
Joined: Feb 2012
Posts: 41
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From: Manitoba,Canada
wiring problems
i got a problem here.. under the hood of my 84 f150 behind the 351W is the cab harness right?? well i reached in because i saw a cut wire...grab the harness and...what the hell?? EVERY WIRE IS CUT!!!!
there are TWO orignal wires that i can see going to the cab!!
the funny thing is that everything works exept for A/C, The roof light and the start position on the ign switch.. so should i be driving it like this? the po said he drive it for months like this but it was not him who did it...it was the last guy.. what should i do????
there are TWO orignal wires that i can see going to the cab!!
the funny thing is that everything works exept for A/C, The roof light and the start position on the ign switch.. so should i be driving it like this? the po said he drive it for months like this but it was not him who did it...it was the last guy.. what should i do????
Moderator
Joined: Jan 2001
Posts: 56,984
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From: Virginia
It depends on what the engine the truck was originally equipped with, it may not even be the original engine. Or your engine may have had computer control, and someone took all that off, and swapped the engine or swapped the carb and the distributor out. I get the feeling you just bought this truck and you really don't know what you have yet correct?
Moderator
Joined: Nov 2007
Posts: 22,415
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From: Denver Metro Area, CO
Actually, there is no way to do this using numbers on any VIN tags, there is no way to prove *any* engine installed in any Ford vehicle is what it came from the factory with.
Best that can be done is determine the *size* of engine originally installed (and maybe if it had EFI or not).
Best that can be done is determine the *size* of engine originally installed (and maybe if it had EFI or not).
Thread Starter
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Freshman User
Joined: Feb 2012
Posts: 41
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From: Manitoba,Canada
back to my problem...should i replace the harness, try to determine the wires i need and fix it or just leave it, like i said everything does work witch is realy confusing.
at school monday i will get the colors of the wires witch are connected and witch have been cut.
at school monday i will get the colors of the wires witch are connected and witch have been cut.
Posting Guru
Joined: Jun 2004
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From: Casa Grande
It kind of depends on where you live and if you have smog checks or not. If the truck is running good and everything work I wouldn't start hooking anything back up unless I knew for sure what it was. If you can still read the emissions sticker under the hook on the radiator support it will tell you what motor it came with. It will be in little letter in the lower right corner, mine says 4.9 or 300/6. Knowing that we can figure out what yours came with and what it has now maybe. Also, does your dizzy have a vacuum advance or a TFI module on it? Does the carb have a lot of wires going to it or just 1 to the chock? I agree with Franklin2, it sounds like someone switched it back from a computerize motor to probably a DSII ignition system. Sounds like they just cut the wires instead of removing the harness.
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Freshman User
Joined: Feb 2012
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From: Manitoba,Canada
i will check the emissions sticker monday. the truck is supposed to have it but most of it is disconnected. the carb has one wire and i think the dizzy is vacuum advance.
i didnt think the 84" trucks were computerized i thought that started in 87 or 88??
i didnt think the 84" trucks were computerized i thought that started in 87 or 88??
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Posting Guru
Joined: Jun 2004
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From: Casa Grande
It all depended on what motor the truck came with, the 4.9 started in 84. 87 was when most, (all?), went EFI. But they had the Feedback carb/TfI computer setup before that. The harness your describing sounds just like the computer harness on my 4.9. I don't know enough to tell you what motors did or didn't come with computers that year but a lot of people on here do. If you only have the chock wire going to your carb then it would be a DSII ignition probably, and should have a vacuum dizzy if they did the complete change over. But I'm betting your truck came with a computer, and probably still has it mounted under the dash. I'm thinking the 2 wires still connected are gauge sensor wires.
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Thread Starter
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Freshman User
Joined: Feb 2012
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From: Manitoba,Canada
there is still all power in the cab though..heater works..radio works, ign switch works for the most part (needs NSS). im positive it is the orignal engine...it looks like it has been there a while..haha
Laughing Gas
Joined: Aug 2010
Posts: 983
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From: Northern Kentucky
1984 F150 351W had computer controlled Carb/ignition /smog equipment.The computer controls were a stand alone harness and didn't affect things like heater, lights etc.;they had their own harness. Someone did the Std. carb/DSII conversion and instead of pulling the wiring harness, just cut it, would be my guess. I just did the conversion on my "84 F150 351W, but I pulled the harness and computer completely out.
Laughing Gas
Joined: Aug 2010
Posts: 983
Likes: 49
From: Northern Kentucky
You are correct as I understand, and the OP didn't say which carb he had. Mine was the 2V which I think were more numerous. If it is a 4V then I am a loss.
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
I thought the HO was only available in 250/350 over 8500gvw at this point.
I may be wrong, but I would think the OP's F-150 would be computer controlled with a TFI ignition.
I may be wrong, but I would think the OP's F-150 would be computer controlled with a TFI ignition.
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Freshman User
Joined: Feb 2012
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From: Manitoba,Canada
it has a 2v carb on it now..and i know the smog crap was bypassed. i am going with whisler's explanation, that someone did a conversion and didnt pull the harness. i like that better then he just hacked up some wires..haha
i am going to take a bunch of pictures, and il post em here on monday after i get back from school..then you guys can be shure...sound good??
i am going to take a bunch of pictures, and il post em here on monday after i get back from school..then you guys can be shure...sound good??