Column Illuminator
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Mountain Pass
Joined: Aug 2004
Posts: 186
Likes: 5
From: Blenheim Ontario Canada
Column Illuminator
Hey all
Finally get back to my restoration...7 years and counting.
I'm having trouble with the light on the column (PRNDL indicator) on my '77 F100, non tilt, no cruise. Using a multi meter I have 12 volts to the copper landing pad where the bulb socket fastens in. I've tested the bulb and socket in other parts of the dash to rule that out.
I've cleaned the copper pad with a pencil eraser, it's clean. I've tried other bulb/socket combos....same result.
I'm wondering if it's a ground issue however all other illumination lamps function.
Any thoughts?
Thanks
Finally get back to my restoration...7 years and counting.
I'm having trouble with the light on the column (PRNDL indicator) on my '77 F100, non tilt, no cruise. Using a multi meter I have 12 volts to the copper landing pad where the bulb socket fastens in. I've tested the bulb and socket in other parts of the dash to rule that out.
I've cleaned the copper pad with a pencil eraser, it's clean. I've tried other bulb/socket combos....same result.
I'm wondering if it's a ground issue however all other illumination lamps function.
Any thoughts?
Thanks
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
Hey all
Finally get back to my restoration...7 years and counting.
I'm having trouble with the light on the column (PRNDL
indicator) on my '77 F100, non tilt, no cruise. Using a multi meter I have 12 volts to the copper landing pad where the bulb socket fastens in. I've tested the bulb and socket in other parts of the dash to rule that out.
I've cleaned the copper pad with a pencil eraser, it's clean. I've tried other bulb/socket combos....same result.
I'm wondering if it's a ground issue however all other illumination lamps function.
Finally get back to my restoration...7 years and counting.
I'm having trouble with the light on the column (PRNDL
indicator) on my '77 F100, non tilt, no cruise. Using a multi meter I have 12 volts to the copper landing pad where the bulb socket fastens in. I've tested the bulb and socket in other parts of the dash to rule that out.I've cleaned the copper pad with a pencil eraser, it's clean. I've tried other bulb/socket combos....same result.
I'm wondering if it's a ground issue however all other illumination lamps function.
D3TZ-7A110-A .. Shift Indicator Dial PRND21 / Reproduced
1973/77 F100/350 C4/C6 / 1973/77 Bronco C4 / 1975/77 Econoline C4/C6/FMX
Dials used in 1978/79 are different, tilt wheel different from non tilt wheel.
Thread Starter
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Mountain Pass
Joined: Aug 2004
Posts: 186
Likes: 5
From: Blenheim Ontario Canada
Thanks Bill for your follow up. It's not the dial indicator I'm having trouble with, it's getting the bulb to illuminate.
I have the Ford Wiring Diagram for the truck. The splice code 806 has the other dash lights joining there. The ground is to the Y Brace behind the dash cluster. It appears good.
Could a defective switch cause this issue?
Rick
I have the Ford Wiring Diagram for the truck. The splice code 806 has the other dash lights joining there. The ground is to the Y Brace behind the dash cluster. It appears good.
Could a defective switch cause this issue?
Rick
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
You have a 1977, so what parts are you using?
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Hey Bill, I think the part the OP is reffering to is basic# 13711 socket and 13466 bulb. You can see this in the diagram section 35 page 15. It's part of the turn signal switch.
To the OP, it does sound like a ground issue. Seeing that you have 12V to the bulb, you've tried different sockets and checked the bulb, I would trace the ground circuit for that particular bulb. As to whether it could be the switch, I've never seen one fail like this but seeing as the bulb is part of the switch I guess it's possible. If all else fails in the troubleshooting I would say replace the switch.
To the OP, it does sound like a ground issue. Seeing that you have 12V to the bulb, you've tried different sockets and checked the bulb, I would trace the ground circuit for that particular bulb. As to whether it could be the switch, I've never seen one fail like this but seeing as the bulb is part of the switch I guess it's possible. If all else fails in the troubleshooting I would say replace the switch.
Thread Starter
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Mountain Pass
Joined: Aug 2004
Posts: 186
Likes: 5
From: Blenheim Ontario Canada
Thanks guys.
The truck was assembled in MI in September of '76.
Here's a pic of the bulb/socket and the socket in the column. I'm using a 194 bulb.
The truck was assembled in MI in September of '76.
Here's a pic of the bulb/socket and the socket in the column. I'm using a 194 bulb.
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Thread Starter
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Mountain Pass
Joined: Aug 2004
Posts: 186
Likes: 5
From: Blenheim Ontario Canada
thanks mikeo0o0o0, might have found the issue...I'm using a 194 bulb, in your post you mentioned a 13466 bulb, and yes I see that in the diagram now. Don't know why I didn't see that sooner....I'll report back.
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Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Bulb, transmission selector dial
D8TZ-13466-A
Industry # 1445 H/D
Thread Starter
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Mountain Pass
Joined: Aug 2004
Posts: 186
Likes: 5
From: Blenheim Ontario Canada
found the problem!
looking at the pic in my earlier post...there's a small copper ring to the right of the copper landing spot where the bulb and base fasten in. I was missing the small screw that goes in there. Once I inserted the screw...tada! the light came on.
thanks guys for your input.
Rick
looking at the pic in my earlier post...there's a small copper ring to the right of the copper landing spot where the bulb and base fasten in. I was missing the small screw that goes in there. Once I inserted the screw...tada! the light came on.
thanks guys for your input.
Rick
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