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#1 |
Senior Member
![]() Join Date: Jul 2007
Location: Clarksville TN 37043
Posts: 8,702
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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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Chuck 68 ![]() ![]() http://67-72chevytrucks.com/vboard/s...d.php?t=374892 My trailer redo http://67-72chevytrucks.com/vboard/s...69#post5893869 Chuy my 59 bug http://67-72chevytrucks.com/vboard/s...d.php?t=653798 Putnam 87 GMC Shop truck http://67-72chevytrucks.com/vboard/s...d.php?t=707687 |
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#2 |
Registered User
![]() Join Date: Apr 2014
Location: detroit mi
Posts: 208
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Re: Whats this plug for?
goes to brake switch for MD8 trans
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#3 |
Senior Member
![]() Join Date: Jul 2007
Location: Clarksville TN 37043
Posts: 8,702
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Re: Whats this plug for?
Oh okay. Thanks
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Chuck 68 ![]() ![]() http://67-72chevytrucks.com/vboard/s...d.php?t=374892 My trailer redo http://67-72chevytrucks.com/vboard/s...69#post5893869 Chuy my 59 bug http://67-72chevytrucks.com/vboard/s...d.php?t=653798 Putnam 87 GMC Shop truck http://67-72chevytrucks.com/vboard/s...d.php?t=707687 |
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#4 |
Registered User
Join Date: Apr 2009
Location: Pflugerville, TX
Posts: 594
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Re: Whats this plug for?
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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#5 |
Senior Member
![]() Join Date: Jul 2007
Location: Clarksville TN 37043
Posts: 8,702
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Re: Whats this plug for?
Thanks for the info. I wish I had a 700r.
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Chuck 68 ![]() ![]() http://67-72chevytrucks.com/vboard/s...d.php?t=374892 My trailer redo http://67-72chevytrucks.com/vboard/s...69#post5893869 Chuy my 59 bug http://67-72chevytrucks.com/vboard/s...d.php?t=653798 Putnam 87 GMC Shop truck http://67-72chevytrucks.com/vboard/s...d.php?t=707687 |
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