Help me understand brake light circuit
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Senior User
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Help me understand brake light circuit
looking at wiring diagrams for brake light circuit it shows hazard switch and directional switch but not how they actually switch current in the circuit...I don't understand why the hazard flasher is in series with the brake light switch...how does the brake light circuit work...?
thanks
thanks
Elder User
Joined: Oct 2004
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From: Ridgeway, Virginia
I don't have the diagram but I don't see how the hazzard lights and the brake lights could function if wired in a series circuit. Seems to me that the hazzard lights would not function until the brake pedal is pushed and the circuit is closed.
By your mentioning a series wired setup I assume you have some decent electronics knowledge. Based on that you know that anytime multiple devices are placed in a series circuit all devices stop working if there is a break anywhere in the circuit. I may have a chance to look at some diagrams. What kind of vehicle are you looking at a diagram for?
By your mentioning a series wired setup I assume you have some decent electronics knowledge. Based on that you know that anytime multiple devices are placed in a series circuit all devices stop working if there is a break anywhere in the circuit. I may have a chance to look at some diagrams. What kind of vehicle are you looking at a diagram for?
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71 F-100
I made a image of the circuit in paint...
click on thumbnail
I can understand how the various lights could be accesed through the hazard and directional switches I don't get how power flows through the stop light switch and hazard flasher or whats happening when that signal gets to the switches
I'm thinking the stop light switch is the brake light switch on the brake pedal..is that right
I made a image of the circuit in paint...
click on thumbnailI can understand how the various lights could be accesed through the hazard and directional switches I don't get how power flows through the stop light switch and hazard flasher or whats happening when that signal gets to the switches
I'm thinking the stop light switch is the brake light switch on the brake pedal..is that right
Last edited by zsir; Oct 8, 2005 at 12:00 PM.
Cargo Master
Joined: Apr 2004
Posts: 2,574
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From: Golden, CO
First off, yes the switch on the pedal is for the brake lights. The switch on the proportioning valve is for the dashboard warning lamp.
zsir, I'm not seeing any image, or link to an image in your last post. Sure would be helpful.
The diagrams I have go back to '73, don't know if that particular circuit is different. What I see here is three points of supply: one for the turn signal, one each for the E. switch and the stop in parallel. Both the E. and turn flashers are ahead (line side) of thier respective switch. The E. switch is parallel with the turn switch. The brake switch is parallel with half of the turn switch, rear lamps only.
The diagram within the turn switch shows the brake switch is bussed to the rear lights only, the E. switch is tapped to the same line (parallel) to supply both lamps with one wire.
So, when you are stepping on the brake and using the turn signal, you have two points of supply to one lamp-same filiment. Clear as mud yet?
zsir, I'm not seeing any image, or link to an image in your last post. Sure would be helpful.
The diagrams I have go back to '73, don't know if that particular circuit is different. What I see here is three points of supply: one for the turn signal, one each for the E. switch and the stop in parallel. Both the E. and turn flashers are ahead (line side) of thier respective switch. The E. switch is parallel with the turn switch. The brake switch is parallel with half of the turn switch, rear lamps only.
The diagram within the turn switch shows the brake switch is bussed to the rear lights only, the E. switch is tapped to the same line (parallel) to supply both lamps with one wire.
So, when you are stepping on the brake and using the turn signal, you have two points of supply to one lamp-same filiment. Clear as mud yet?
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Here's a link to a diagram I made stop switch .....strange though ....the link and a thumbnail show in my last post.... for me anyway....
"Mifflin Clay"
Joined: Jul 2005
Posts: 3,177
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From: Mifflin, PA
Originally Posted by zsir
looking at wiring diagrams for brake light circuit it shows hazard switch and directional switch but not how they actually switch current in the circuit...I don't understand why the hazard flasher is in series with the brake light switch...how does the brake light circuit work...?
thanks
thanks
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Cargo Master
Joined: Apr 2004
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From: Golden, CO
I'm getting closer, found a diagram for '70. This one shows the stop switch and E. flasher wired parallel to the fuse block. Both are fed by the same hot wire. Turn flasher is fed by a seperate hot.
Me eyes are starting to cross, I'll send a link via email.
Me eyes are starting to cross, I'll send a link via email.
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Originally Posted by Hypoid
zsir, I'm not seeing any image, or link to an image in your last post. Sure would be helpful.
John
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Originally Posted by Hypoid
Me eyes are starting to cross, I'll send a link via email.
It can be in the tens of thousands of dollars... for each item infringed. Its why we only use items Ford specifically gives us or to the general press for distribution.
Whoever is posting scans is setting themselves up for disaster.
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