Help in identifying wires on engine harness
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Laughing Gas
Joined: Jan 2016
Posts: 828
Likes: 66
From: Hartford, WI
Help in identifying wires on engine harness
My '77 F150 4x4 351m engine harness has just two wires next to each other that the previous owner had cut and where just laying there. Around the passenger side of the carb. The wires look like they are red and dark blue (after I cleaned all of the overspray blue paint from them). Does anyone know what they are suppose to go to? My guess is electric choke or the idle solenoid (which is gone also). The truck starts fine and runs great with out the wires hooked up to anything but I'd like to know what they went to.
They are the two wires on the right side of the above picture. The red wire with the female plug goes to the temperature sensor, and of course the semi circular object goes to the coil and the last plug goes to the distributor.
Here is a close up picture of the cut wires.
and I want to say they run back to this oval shaped plug in the upper right hand side of the next picture. This plugs into a wiring harness coming out of the firewall.
Here is another view of the plug. Yes I had to splice in a new plug as the old plug was broken in like 4 pieces for what ever reason.
Thanks, Shortbox4x4
They are the two wires on the right side of the above picture. The red wire with the female plug goes to the temperature sensor, and of course the semi circular object goes to the coil and the last plug goes to the distributor.
Here is a close up picture of the cut wires.
and I want to say they run back to this oval shaped plug in the upper right hand side of the next picture. This plugs into a wiring harness coming out of the firewall.
Here is another view of the plug. Yes I had to splice in a new plug as the old plug was broken in like 4 pieces for what ever reason.
Thanks, Shortbox4x4
Thread Starter
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Laughing Gas
Joined: Jan 2016
Posts: 828
Likes: 66
From: Hartford, WI
I was looking at all of the wiring schematics for the '77 trucks. There is a red and green wire assy. that go to what is called a "throttle actuator". In the wiring diagram there is a blue wire that runs to the idle solenoid. So it's something to do with carburetion/fuel circuit but I've never heard of a "throttle actuator" on a dent side.
I looked at pictures of my '77 F350 that had a 460 in it and it had the same male plug on the firewall but this part of the harness was missing (I still have the harness that goes to the engine) so the PO of that truck had to have removed it. The carb that is on the 460 is a Carter AFB. So that makes sense.
Anyone got any ideas what a throttle actuator is?
Thanks, Shortbox4x4
I looked at pictures of my '77 F350 that had a 460 in it and it had the same male plug on the firewall but this part of the harness was missing (I still have the harness that goes to the engine) so the PO of that truck had to have removed it. The carb that is on the 460 is a Carter AFB. So that makes sense.
Anyone got any ideas what a throttle actuator is?
Thanks, Shortbox4x4
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
I was looking at all of the wiring schematics for the '77 trucks. There is a red and green wire assy. that go to what is called a "throttle actuator". In the wiring diagram there is a blue wire that runs to the idle solenoid. So it's something to do with carburetion/fuel circuit but I've never heard of a "throttle actuator" on a dent side.
Anyone got any ideas what a throttle actuator is?
Anyone got any ideas what a throttle actuator is?
This example: 1975/77 F100 302 w/a M/T
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