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Unread 07-08-2010, 12:46 PM   #1
cwbymt1973
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brake switch question

Anyone do a 4.3 swap and put a auto in and have to run the 4 pin brake switch to lock and unlock the convertor. if so can you tell or send me a pic of how you mounted to the brake pedal or how you did your setup. i used a painless wiring harness in mine.

Thanks,

Matt

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Unread 07-08-2010, 03:07 PM   #2
5.7YJ
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I couldn't find a brake light switch that would work without the extra work of adding a bracket. What I did was use a relay activated by the stock brake light switch. It has been a while since I did it and will have to see how I wired it. I have the diagram from the back page of my Painless installation book and have notes telling me what color wires I used to make it work but I need to get under the dash and look before I tell you something wrong. I will take a look, scan the page and get back with you.
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Unread 07-08-2010, 06:37 PM   #3
cwbymt1973
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that would be awesome thanks for the help
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Unread 07-09-2010, 09:47 AM   #4
5.7YJ
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Here is the diagram of how mine is hooked up. I hope this will help.
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Unread 07-09-2010, 10:08 AM   #5
cwbymt1973
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And you used the one already on the jeep right
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Unread 07-09-2010, 02:56 PM   #6
cwbymt1973
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And wiring this way will lock and unlock my torque converter.

Matt
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Unread 07-09-2010, 08:13 PM   #7
5.7YJ
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It will unlock the convertor when you step on the brakes and the speed sensor should keep it unlocked until 45 miles per hour or so. This is how I understood it, the diagram used a pressure type brake switch but I saw no difference in using my stock brake light switch.
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Unread 07-09-2010, 09:20 PM   #8
cwbymt1973
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great thanks i am all over that to see what happens.

Matt
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Unread 07-09-2010, 10:37 PM   #9
cwbymt1973
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ok so wired like the pic last question how do you know when its locked and unlocked?
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Unread 07-12-2010, 09:31 AM   #10
5.7YJ
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If it was locked up at idle (in gear and on the brakes) it would push the Jeep forward and lug it down, and when your above 45 (if using a non-adjustable speed sensor) hit the brakes while on the gas and your RPM's will come up a few hundred.
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Unread 07-12-2010, 07:41 PM   #11
cwbymt1973
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yea thats what it did thanks again for your help

Matt
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