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53 Ford F-100 Dome Light Circuit


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jniolon 
Member - Posts: 4
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Joined: March 06, 2009
Location: Alabama, United States
Posted: July 10, 2018 at 2:35 PM / IP Logged Link to Post Post Reply Quote jniolon
I'm building a '53 ford f-100 and wiring is the current project. I'm having a problem with dome light circuit. Here's what I have. Original equipment dome light with switch. Light housing provides ground for the circuit. Uses a single filament bulb with the case contacting the socket to make ground. two non grounded door switches. 12 volts applied from fuse panel to switch and to one side of door switch wiring.
My new headlight switch has a dome light position that grounds the circuit to complete the loop and lights the light.
With my dome light housing grounded this switch will not work (i don't think) I need a wiring diagram that will let me use the grounded housing (expensive) and the headlight switch (expensive) together to make lights on using the position on the headlight switch... the door switches and the switch on the housing (although that seems redundant doesn't it) I guess I could somehow isolate the housing from ground but it would take some fabrication work for that.
Ron Francis wiring offers a "reverse dome relay" (also expensive) that they say will cure this problem... but it shouldn't be that hard, right ?? I've just got a mental block on this
tia
John
the12volt 
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Location: Louisiana, United States
Posted: July 10, 2018 at 2:52 PM / IP Logged Link to Post Post Reply Quote the12volt
Hi John, connect the ground output from the headlight switch to an SPDT relay like this with the output from the relay going to your dome light: https://www.the12volt.com/relays/relaydiagram8.html
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jniolon 
Member - Posts: 4
Member spacespace
Joined: March 06, 2009
Location: Alabama, United States
Posted: July 10, 2018 at 8:40 PM / IP Logged Link to Post Post Reply Quote jniolon
53 Ford F-100 Dome Light Circuit -- posted image.
this work ???
john
anyday above ground is a good day !
the12volt 
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Administrator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 07, 2002
Location: Louisiana, United States
Posted: July 10, 2018 at 8:54 PM / IP Logged Link to Post Post Reply Quote the12volt
No. The door switches should supply 12V+ directly to the dome light. The relay is needed only for the headlight switch to turn on the dome light.
53 Ford F-100 Dome Light Circuit -- posted image. the12volt • Support the12volt.com
the12volt 
Administrator - Posts: 4,031
Administrator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 07, 2002
Location: Louisiana, United States
Posted: July 10, 2018 at 9:23 PM / IP Logged Link to Post Post Reply Quote the12volt
53 Ford F-100 Dome Light Circuit -- posted image.
53 Ford F-100 Dome Light Circuit -- posted image. the12volt • Support the12volt.com

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