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I'm thinking I'll probably just chance it and throw 12VDC constant to it anyway, since I can't really see the PCM sending 3.5V, 5V, 7.5V, etc... to the solenoid... it just doesn't seem likely. Maybe I'll check it out tomorrow a little more and see if I can trace the wires back to a relay or something...
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Seems like an added OEM cost to send lower voltage there or have a relay. Plus the resistance losses are greater at lower voltage.
I tapped into my lockup wire at the ECU connector. Have you looked at pinout diagrams for your vehicle? Don't need them if you know the color but it helps to know where to look. If you find it and have a good multimeter with a 10A fuse for the ammeter just run it thru that and take a trip. You have to find it anyway seems cheap insurance to test the V.
Considering you can buy kits to do this, I can't imagine anything other than 12V. They seem to be wires with switches. No fancy electronics. 'Course I'd hate to be responsible for someone breaking something so I'll end with: Test to be sure.