Pics Request
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Elder User
Joined: May 2009
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From: Peoria, Arizona
Pics Request
Can anyone take a picture of their wiring setup for an 85 f150 in the engine bay? I'm transplanting an 85 302 into my 82 truck and for some reason the wiring is not agreeing with me!
I need especially the passenger side around the solenoid
Thanks guys and gals
I need especially the passenger side around the solenoid
Thanks guys and gals
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Elder User
Joined: May 2009
Posts: 729
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From: Peoria, Arizona
85 had a 2 bl carb on the 302.
I have a part of the wiring harness with a red insert on it that plugs into nothing with a single connector next to it and a frayed wire next to that. It turns over has spark and fuel but just wont start. it keeps going and going. I took off the timing cover because I thought that it had jumped time badly but the "dots" match up on the timing sprockets... I'm stumped which is why I think it has to be a wiring issue.
I have a part of the wiring harness with a red insert on it that plugs into nothing with a single connector next to it and a frayed wire next to that. It turns over has spark and fuel but just wont start. it keeps going and going. I took off the timing cover because I thought that it had jumped time badly but the "dots" match up on the timing sprockets... I'm stumped which is why I think it has to be a wiring issue.
Elder User
Joined: Jun 2006
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As stated, if you have spark and fuel, it's not a wiring problem.
I think you need a compression test. Your timing might be 180* off.
I think you need a compression test. Your timing might be 180* off.
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Senior User
Joined: May 2007
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From: Arkoma,Oklahoma
my 85 is fuel injected not sure if it will help but i can try to get you a pic tomorrow after work
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Junior User
Joined: Dec 2009
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From: Canada
The solenoid will have an extra terminal on it for the fuel pump during cranking.
in the 1984-1986 series truck with the duraspark ignition there is a second small terminal on the solenoid. It is a pink/black wire with a fuseable link.
diagram for the TFI module distributor is on page 12-29 of my Haynes manual.
page 12-31 is the diagram for the duraspark type ignition.
It has different wiring of the solenoid than the TFI module.
wire coming from the starter side of the solenoid would bypass the low oil pressure cutoff switch and provide fuel and fuel pump activity during startup when the oil pressure is low.
in the 1984-1986 series truck with the duraspark ignition there is a second small terminal on the solenoid. It is a pink/black wire with a fuseable link.
diagram for the TFI module distributor is on page 12-29 of my Haynes manual.
page 12-31 is the diagram for the duraspark type ignition.
It has different wiring of the solenoid than the TFI module.
wire coming from the starter side of the solenoid would bypass the low oil pressure cutoff switch and provide fuel and fuel pump activity during startup when the oil pressure is low.
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Elder User
Joined: May 2009
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From: Peoria, Arizona
The 85 had a Mechanical fuel pump. I Think that in June of 85 they stopped producing the mechanical fuel pump/carburetor model and switched to efi and electric.
I dont have a wire coming off of the extra terminal marked I on the starter side of the solenoid. My thought was that I dont have the wiring that sents voltage back to the coil when the truck is starting hooked up right and so I get a weak spark? I dont know how to tell if my spark is weak or normal.
I did a compression test and I have 120 all around except one cylinder which is a little below that.
Thanks guys/gals
I dont have a wire coming off of the extra terminal marked I on the starter side of the solenoid. My thought was that I dont have the wiring that sents voltage back to the coil when the truck is starting hooked up right and so I get a weak spark? I dont know how to tell if my spark is weak or normal.
I did a compression test and I have 120 all around except one cylinder which is a little below that.
Thanks guys/gals
Junior User
Joined: Dec 2009
Posts: 91
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From: Canada
Connect a temporary wire to the + on the coil from the battery and see if it starts. (dont leave it connected)
And as newrider3 says "Do you have the plug wire sequence correct?"
What distributor are you using?
And as newrider3 says "Do you have the plug wire sequence correct?"
What distributor are you using?
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Elder User
Joined: May 2009
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From: Peoria, Arizona
I'm using the original Motorcraft distributor.
The sequence is correct. going counter clock wise 15426378 if I remember it right. I went off of what Haynes and the the intake said.
The sequence is correct. going counter clock wise 15426378 if I remember it right. I went off of what Haynes and the the intake said.
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Elder User
Joined: May 2009
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From: Peoria, Arizona
I dont think its likely as the person that had the engine before me didn't seem to take a whole lot of care (or put any money into maintaining) the thing. Cant hurt to try that firing order though! Thanks!
Elder User
Joined: Feb 2007
Posts: 690
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From: Madison Ohio
Does it try at all or just crank and crank? The I on the solenoid is for fuel pumps if EFI or Ignition on some old nonEFI engines. Your harness should have a little red boot that would just slip on the pin like the other side to crank the engine. I had a old 76 that the magnets in the pickup coil broke and once the motor got hot it would shut down due to the magnets moving and messing up the timing. If your wires were wrong it would shoot flames out the carb ( dont ask how I know this )
Your spark should be bright and blue. If its dim and or orange / red its weak.
Your spark should be bright and blue. If its dim and or orange / red its weak.