factory clock?
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
2 - Is there any chance that an 81 Custom F100 would have a harness without a clock circuit?
Look at the bottom of the dash, just below the heater control panel. you should see two empty plugs with nothing plugged into them. Those are for the clock and the courtesy lamp group. This is where the short wiring harness for the clock and the courtesy lamp group plugs in, and from there goes to the top of the dash where the other end plugs in the clock.
So to transplant a clock from another 1980-1982 truck into your 1981, you would need the clock, and the short clock harness that plugs into those empty plugs at the bottom of your dash.
Seems odd to me that production would run with two styles and I'm more inclined to think that one of the P.O.s hacked it out for a radio (judging by the 'custom' hole in the bezel) but want to confirm.
Tuned
Joined: Oct 2008
Posts: 387
Likes: 2
From: Las Cruces NM
No the harness plugs are different between the 1980-1982 clocks and the 1983-1986 clocks, so they cant be easily swapped out.
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No, the clock is already prewired in the main harness of the truck. The clock was an option on all trim levels, so all trucks have the wiring in the main harness. What you are missing is the harness extentions from the main harness to the top of the dash.
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So to transplant a clock from another 1980-1982 truck into your 1981, you would need the clock, and the short clock harness that plugs into those empty plugs at the bottom of your dash.
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No, the clock is already prewired in the main harness of the truck. The clock was an option on all trim levels, so all trucks have the wiring in the main harness. What you are missing is the harness extentions from the main harness to the top of the dash.
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So to transplant a clock from another 1980-1982 truck into your 1981, you would need the clock, and the short clock harness that plugs into those empty plugs at the bottom of your dash.
The clock I have is a post-82 version that I clipped about 8" of harness with, I read that the wiring is different so I figured I would get the plug with the clock to help with the wire swap.
Had I been aware of the extension harnesses, I would have taken it from end to end.
The next obvious question is if the main harness side of that clock extension harness is the same between the 81 and the post-82?
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
You can get the plug off the main harness of a 1983-1986, and use the clock extention, if you remove the wires from the two plugs on the 1980-1982 type, and transfere it to the new 1983-1986 type plug. The wires will remove from the plugs without cutting.
To get the headlamp on warning buzzer, and underdash courtesy lamps, you have to find one for a 1980-1982, or adapt the harness from a 1983. On the 1984-1986 the headlamp warning buzzer wires is a part of the main harness and cant be used, because the 1984-1986 headlamp warning and seat belt buzzer is one unit. 1980-1983 they are two seperate buzzers.
On the 1980-1982 the courtesy lamp harness and clock harness plugs are two seperate plugs. The 1983. they are combined into one plug, but two seperate harnesses, and the 1984-1986 the headlamp buzzer is wired into the main harness.
To get the headlamp on warning buzzer, and underdash courtesy lamps, you have to find one for a 1980-1982, or adapt the harness from a 1983. On the 1984-1986 the headlamp warning buzzer wires is a part of the main harness and cant be used, because the 1984-1986 headlamp warning and seat belt buzzer is one unit. 1980-1983 they are two seperate buzzers.
On the 1980-1982 the courtesy lamp harness and clock harness plugs are two seperate plugs. The 1983. they are combined into one plug, but two seperate harnesses, and the 1984-1986 the headlamp buzzer is wired into the main harness.
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