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Old 04-15-2008, 10:13 AM
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700r4 lockup internal wiring

Hello all,
I have an '88 700r4 that I am prepping to install behind my 400 SBC. So far I have put in a shift kit and gathering parts for a mechanical speedo swap.

I would like to set it up internally to have a 1-wire lockup. I found a page that I think Crosley made immensely helpful http://www.geocities.com/crosley_az/lockup1.htm.

Mine appears to be a little different from his, so I wanted a quick check-in and feedback on a quickie wiring diagram I made, based on the photos in his site. I started a new thread, since many recent threads seem to only deal with wiring the lockup from the outside. The pics are of my trans upside-down with the pan off and the front at the top of the photos. The pdf wiring diagram assumes the same orientation.

Is the wiring diagram correct? Either way, please let me know and it can become part of the knowledge base or I can correct it to make it useful for that purpose.

I do plan to test my position "A" switch to ensure it is good and Normally Open by the method outlined in pages linked above and remove the thermal sensor and remove & block off the other (dark/normally-closed? 2-prong) switch/sensor.

Thank you in advance for sharing you knowledge.
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Old 04-15-2008, 08:16 PM
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I took a quick look at diagram. it appears correct.

It is a simple 12 volt circuit with the NO switch provides ground in OD.

the correct port is the pictured silver switch with single connector pin.... blue(?) connector on it.

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Old 04-16-2008, 07:14 AM
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Thank you for your response and expertise!
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