Author Topic: No brake lights  (Read 689 times)

richflorence

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No brake lights
« on: August 01, 2022, 03:14:21 PM »
Guys:

I got a puzzler. Brake lights quit working, so replaced the stoplight switch. This has happened before, so replacing the switch has always solved the problem. Old switch tested good on the bench, but I still replaced it with a new one. It was working fine on Friday, but when I tried it today, no brake lights again. Any suggestions of where else to look? Original/unrestored '69 GT-350.

Thanks.
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Shelbypat

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Re: No brake lights
« Reply #1 on: August 01, 2022, 04:20:02 PM »
First. Check voltage when brake is apply both side of brake switch...Using a voltmeter is the best, and, FYI brake switch is feeded by a termal breaker under the console.

Patrick

Rukiddin

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Re: No brake lights
« Reply #2 on: August 01, 2022, 04:36:09 PM »
Try working the emergency flasher switch on/off a few times

Coralsnake

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Re: No brake lights
« Reply #3 on: August 01, 2022, 05:05:31 PM »
Turn signal wiring
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richflorence

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Re: No brake lights
« Reply #4 on: August 01, 2022, 05:14:25 PM »
Thanks guys! Much appreciated.
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Bill

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Re: No brake lights
« Reply #5 on: August 01, 2022, 06:30:22 PM »
Turn signal wiring

Or turn signal switch.

Went through two NOS units and one Drake reproduction to get enough parts to make one turn signal switch to actually work as it is supposed to.  ::)

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Rickmustang

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Re: No brake lights
« Reply #6 on: August 01, 2022, 06:35:17 PM »
Try a NOS switch vs a reproduction
1965 G.T. 350
1967 Fairlane GT - 390 4-speed
1970 Mach 1 - 428CJ 4-speed/AC
1971 Mach 1 - 429CJ auto/AC
2005 Ford GT

richflorence

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Re: No brake lights
« Reply #7 on: August 01, 2022, 07:56:17 PM »
Thinking now it may be the old original sequencer. Getting power back to the taillights but itís intermittent. I appreciate all the tips. Opened the sequencer box for the first time, and itís looking rather corroded inside.
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richflorence

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Re: No brake lights
« Reply #8 on: August 09, 2022, 05:51:26 AM »
Ended up being the 53 year old taillight sequencer. Shorted out the 2 pins in the harness so we replaced the sequencer and created a work around for the harness pins and now working like it should.
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Cobrask8

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Re: No brake lights
« Reply #9 on: August 09, 2022, 12:12:53 PM »
Everybody beat me with correct answers.

Turn signal switch or trunk unit.

Do you have any of the wiring diagrams? Makes it easy to troubleshoot. I have some simplified wiring diagrams for the sequencer input and output wires if needed.

Dan

richflorence

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Re: No brake lights
« Reply #10 on: August 09, 2022, 01:20:49 PM »
Trunk unit. Replacing it solved the problem. We did a work around for the 2 burned pins in the under dash harness.
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