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Old 06-03-2016, 10:38 PM   #1
thelonerife
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Question Whats this plug for?
I have an 87 GMC and removed the radio today and afterward this plug caught my eye. It has a purple and pink w/purple line wires to it. I looked at wiring diagrams online and can't find it. Any help is appreciated.
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Old 06-04-2016, 06:33 PM   #2
cdub2010
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Re: Whats this plug for?
goes to brake switch for MD8 trans
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Old 06-04-2016, 07:23 PM   #3
thelonerife
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Re: Whats this plug for?
Oh okay. Thanks
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Old 06-04-2016, 07:39 PM   #4
foamypirate
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Re: Whats this plug for?
Quote:
Originally Posted by thelonerife View Post
Oh okay. Thanks
Yep! To expand on the other poster's answer, it's the 12v+ feed to the torque converter lockup for 700R4 transmissions. Brake pedal application breaks the circuit, removing 12v+, and unlocking the converter. If you have a TH400, it will still be in the harness, but unplugged.
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Old 06-06-2016, 12:44 PM   #5
thelonerife
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Re: Whats this plug for?
Thanks for the info. I wish I had a 700r.
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